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Yu Q, Wang J, Liang C, Meng J, Xu J, Liu Y, Zhao S, Xi X, Xi C, Yang M, Si C, He Y, Wang D, Jiang C. A Giant Magneto-Superelasticity of 5% Enabled by Introducing Ordered Dislocations in Ni 34Co 8Cu 8Mn 36Ga 14 Single Crystal. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024; 11:e2401234. [PMID: 38654685 PMCID: PMC11220696 DOI: 10.1002/advs.202401234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2024] [Revised: 04/14/2024] [Indexed: 04/26/2024]
Abstract
Elasticity, featured by a recoverable strain, refers to the ability that materials can return to their original shapes after deformation. Typically, the elastic strains of most metals are well-known 0.2%. In shape memory alloys and high entropy alloys, the elastic strains can be several percent, as called superelasticity, which are all triggered by external stresses. A superelasticity induced by magnetic field, termed as magneto-superelasticity, is extremely important for contactless work of materials and for developing brand-new large stroke actuators and high efficiency energy transducers. In magnetic shape memory alloys, the twin boundary motion driven by magnetic field can output a strain of several percent. However, this strain is unrecoverable when removing the magnetic field and hence it is not magneto-superelasticity. Here, a giant magneto-superelasticity of 5% in a Ni34Co8Cu8Mn36Ga14 single crystal is reported by introducing arrays of ordered dislocations to form preferentially oriented martensitic variants during the magnetically induced reverse martensitic transformation. This work provides an opportunity to achieve high performance in functional materials by defect engineering.
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Affiliation(s)
- Qijia Yu
- School of Materials Science and EngineeringKey Laboratory of Advanced Aerospace Materials and Performance (Ministry of Education)Beihang UniversityBeijing100191P. R. China
| | - Jingmin Wang
- School of Materials Science and EngineeringKey Laboratory of Advanced Aerospace Materials and Performance (Ministry of Education)Beihang UniversityBeijing100191P. R. China
| | - Chuanxin Liang
- Center of Microstructure ScienceFrontier Institute of Science and TechnologyState Key Laboratory for Mechanical Behavior of MaterialsXi'an Jiaotong UniversityXi'anShaanxi710049P. R. China
| | - Jiaxi Meng
- School of Materials Science and EngineeringKey Laboratory of Advanced Aerospace Materials and Performance (Ministry of Education)Beihang UniversityBeijing100191P. R. China
| | - Jinyue Xu
- School of Materials Science and EngineeringKey Laboratory of Advanced Aerospace Materials and Performance (Ministry of Education)Beihang UniversityBeijing100191P. R. China
| | - Yang Liu
- School of Materials Science and EngineeringKey Laboratory of Advanced Aerospace Materials and Performance (Ministry of Education)Beihang UniversityBeijing100191P. R. China
| | - Shiteng Zhao
- School of Materials Science and EngineeringKey Laboratory of Advanced Aerospace Materials and Performance (Ministry of Education)Beihang UniversityBeijing100191P. R. China
| | - Xuekui Xi
- Beijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing100190P. R. China
| | - Chuanying Xi
- Anhui Province Key Laboratory of Condensed Matter Physics at Extreme ConditionsHigh Magnetic Field Laboratory of the Chinese Academy of ScienceHefeiAnhui230031P. R. China
| | - Ming Yang
- National High Magnetic Field Center and School of PhysicsHuazhong University of Science and TechnologyWuhan430074P. R. China
| | - Chen Si
- School of Materials Science and EngineeringKey Laboratory of Advanced Aerospace Materials and Performance (Ministry of Education)Beihang UniversityBeijing100191P. R. China
| | - Yangkun He
- School of Materials Science and EngineeringKey Laboratory of Advanced Aerospace Materials and Performance (Ministry of Education)Beihang UniversityBeijing100191P. R. China
| | - Dong Wang
- Center of Microstructure ScienceFrontier Institute of Science and TechnologyState Key Laboratory for Mechanical Behavior of MaterialsXi'an Jiaotong UniversityXi'anShaanxi710049P. R. China
| | - Chengbao Jiang
- School of Materials Science and EngineeringKey Laboratory of Advanced Aerospace Materials and Performance (Ministry of Education)Beihang UniversityBeijing100191P. R. China
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2
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Ma S, Zhang X, Zheng G, Qian M, Geng L. Cu- and Fe-Doped Ni-Mn-Sn Shape Memory Alloys with Enhanced Mechanical and Magnetocaloric Properties. MATERIALS (BASEL, SWITZERLAND) 2024; 17:3172. [PMID: 38998254 PMCID: PMC11242043 DOI: 10.3390/ma17133172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2024] [Revised: 06/23/2024] [Accepted: 06/26/2024] [Indexed: 07/14/2024]
Abstract
Ni-Mn-Sn-based ferromagnetic shape memory alloys (FSMAs) are multifunctional materials that are promising for solid-state refrigeration applications based on the magnetocaloric effect (MCE) and elastocaloric effect (eCE). However, a combination of excellent multi-caloric properties, suitable operating temperatures, and mechanical properties cannot be well achieved in these materials, posing a challenge for their practical application. In this work, we systematically study the phase transformations and magnetic properties of Ni50-xMn38Sn12Cux (x = 0, 2, 3, 4, 5, and 6) and Ni50-yMn38Sn12Fey (y = 0, 1, 2, 3, 4, and 5) alloys, and the magnetic-structural phase diagrams of these alloy systems are reported. The influences of the fourth-element doping on the phase transitions and magnetic properties of the alloys are elucidated by first-principles calculations. This work demonstrates that the fourth-element doping of Ni-Mn-Sn-based FSMA is effective in developing multicaloric refrigerants for practical solid-state refrigeration.
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Affiliation(s)
- Siyao Ma
- School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China; (S.M.)
- Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hong Kong, China
| | - Xuexi Zhang
- School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China; (S.M.)
| | - Guangping Zheng
- Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hong Kong, China
| | - Mingfang Qian
- School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China; (S.M.)
| | - Lin Geng
- School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China; (S.M.)
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3
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Zheng W, Kang J, Niu K, Ophus C, Chan EM, Ercius P, Wang LW, Wu J, Zheng H. Reversible phase transformations between Pb nanocrystals and a viscous liquid-like phase. SCIENCE ADVANCES 2024; 10:eadn6426. [PMID: 38896628 PMCID: PMC11186508 DOI: 10.1126/sciadv.adn6426] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2023] [Accepted: 05/14/2024] [Indexed: 06/21/2024]
Abstract
Phase transformations have been a prominent topic of study for both fundamental and applied science. Solid-liquid reaction-induced phase transformations can be hard to characterize, and the transformation mechanisms are often not fully understood. Here, we report reversible phase transformations between a metal (Pb) nanocrystal and a viscous liquid-like phase unveiled by in situ liquid cell transmission electron microscopy. The reversible phase transformations are obtained by modulating the electron current density (between 1000 and 3000 electrons Å-2 s-1). The metal-organic viscous liquid-like phase exhibits short-range ordering with a preferred Pb-Pb distance of 0.5 nm. Assisted by density functional theory and molecular dynamics calculations, we show that the viscous liquid-like phase results from the reactions of Pb with the CH3O fragments from the triethylene glycol solution under electron beam irradiation. Such reversible phase transformations may find broad implementations.
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Affiliation(s)
- Wenjing Zheng
- School of Energy and Power Engineering, North University of China, Taiyuan 030051, China
| | - Jun Kang
- Beijing Computational Science Research Center, Beijing 100193, China
- Department of Physics, Beijing Normal University, Beijing 100875, China
| | - Kaiyang Niu
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Colin Ophus
- National Center for Electron Microscopy, Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Emory M. Chan
- The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Peter Ercius
- National Center for Electron Microscopy, Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Lin-Wang Wang
- Institute of Semiconductors, University of Chinese Academy of Sciences, Beijing 100083, China
| | - Junqiao Wu
- Department of Materials Science and Engineering, University of California, Berkeley, Berkeley, CA 94720, USA
| | - Haimei Zheng
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
- Department of Materials Science and Engineering, University of California, Berkeley, Berkeley, CA 94720, USA
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4
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Manley ME, Stonaha PJ, Bruno NM, Karaman I, Arroyave R, Chi S, Abernathy DL, Stone MB, Chumlyakov YI, Lynn JW. Hybrid magnon-phonon localization enhances function near ferroic glassy states. SCIENCE ADVANCES 2024; 10:eadn2840. [PMID: 38875343 PMCID: PMC11177935 DOI: 10.1126/sciadv.adn2840] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2023] [Accepted: 05/09/2024] [Indexed: 06/16/2024]
Abstract
Ferroic materials on the verge of forming ferroic glasses exhibit heightened functionality that is often attributed to competing long- and short-range correlations. However, the physics underlying these enhancements is not well understood. The Ni45Co5Mn36.6In13.4 Heusler alloy is on the edge of forming both spin and strain glasses and exhibits magnetic field-induced shape memory and large magnetocaloric effects, making it a candidate for multicaloric cooling applications. We show using neutron scattering that localized magnon-phonon hybrid modes, which are inherently spread across reciprocal space, act as a bridge between phonons and magnons and result in substantial magnetic field-induced shifts in the phonons, triple the caloric response, and alter phase stability. We attribute these modes to the localization of phonons and magnons by antiphase boundaries coupled to magnetic domains. Because the interplay between short- and long-range correlations is common near ferroic glassy states, our work provides general insights on how glassiness enhances function.
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Affiliation(s)
- Michael E Manley
- Materials Sciences and Technology Division, Oak Ridge National Lab, Oak Ridge, TN 37831, USA
| | - Paul J Stonaha
- Materials Sciences and Technology Division, Oak Ridge National Lab, Oak Ridge, TN 37831, USA
| | - Nickolaus M Bruno
- Department of Materials Science and Engineering, Texas A&M University, College Station, TX 77843, USA
- NASA Glenn Research Center, Cleveland, OH 44135, USA
| | - Ibrahim Karaman
- Department of Materials Science and Engineering, Texas A&M University, College Station, TX 77843, USA
| | - Raymundo Arroyave
- Department of Materials Science and Engineering, Texas A&M University, College Station, TX 77843, USA
| | - Songxue Chi
- Neutron Scattering Division, Oak Ridge National Lab, Oak Ridge, TN 37831, USA
| | - Douglas L Abernathy
- Neutron Scattering Division, Oak Ridge National Lab, Oak Ridge, TN 37831, USA
| | - Matthew B Stone
- Neutron Scattering Division, Oak Ridge National Lab, Oak Ridge, TN 37831, USA
| | - Yuri I Chumlyakov
- Siberian Physical Technical Institute, Tomsk State University, Tomsk, Russia
| | - Jeffrey W Lynn
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD, 20899, USA
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Zhang Z, Bai Y, Gong Y, Chen B, Pan S, Guo Y, Xu F. Understanding the effect of foreign atoms occupation on the metamagnetic behaviors in MnCoSi-based alloys: taking Pt-doping as an example. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2024; 36:255803. [PMID: 38457830 DOI: 10.1088/1361-648x/ad31bc] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2023] [Accepted: 03/08/2024] [Indexed: 03/10/2024]
Abstract
Present research on TiNiSi-type MnCoSi-based alloys focuses on finding a suitable doping element to effectively reduce the critical magnetic field (μ0Hcri) required to induce a metamagnetic transition. This paper provides a guide to achieve this goal through an experimental investigation of Mn1-xPtxCoSi and MnCo1-xPtxSi alloys. In Mn1-xPtxCoSi, asxincreases,μ0Hcriat room temperature decreases, while in MnCo1-xPtxSi, it increases. This phenomenon can be attributed to the fact that larger Pt atoms prefer Co sites over Mn sites, as predicted by our density-functional theory. Consequently, in Mn1-xPtxCoSi, larger Co atoms are extruded into the Mn atoms chain, increasing the nearest Mn-Mn distance and resulting in a reducedμ0Hcri. This finding suggests that transition-metal atoms with more valence electrons preferably occupy the Co site, while those with fewer valence electrons preferably occupy the Mn site. Adhering to this rule, one can easily obtain a lowμ0Hcriand large magnetostrain under a low magnetic field by selecting a suitable foreign element and chemical formula, as demonstrated by the Mn1-xPtxCoSi alloy.
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Affiliation(s)
- Zhishuo Zhang
- MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials Technology, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, People's Republic of China
| | - Yuqing Bai
- MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials Technology, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, People's Republic of China
| | - Yuanyuan Gong
- MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials Technology, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, People's Republic of China
| | - Bin Chen
- MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials Technology, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, People's Republic of China
| | - Shuang Pan
- MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials Technology, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, People's Republic of China
| | - Yong Guo
- MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials Technology, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, People's Republic of China
| | - Feng Xu
- MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials Technology, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, People's Republic of China
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6
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Ge Y, Lünser K, Ganss F, Gaal P, Fink L, Fähler S. Growth and martensitic transformation of ferromagnetic Co-Cr-Ga-Si epitaxial films. SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS 2023; 24:2251368. [PMID: 37705532 PMCID: PMC10496528 DOI: 10.1080/14686996.2023.2251368] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Revised: 07/30/2023] [Accepted: 08/07/2023] [Indexed: 09/15/2023]
Abstract
During cooling, conventional martensitic transformation can only be realized from austenite to martensite. Recently, a so-called reentrant martensitic transformation attracted much interest due to an additional transformation from martensite to austenite during further cooling. Obviously, materials with this reentrant transformation will increase the number of physical effects and possible applications. However, until now, only bulk samples have been available, which are not suitable for applications in micro-devices. In this work, we focus on the Co-Cr-Ga-Si system and examine the suitability of this system for the growth of thin films. We observed that the films grow epitaxially on MgO (100) substrates and exhibit a martensitic transformation if deposited at a sufficiently high temperature or with an additional heat treatment. Films within the austenite state are ferromagnetic while films within the martensitic state just exhibit a very low ferromagnetic order.
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Affiliation(s)
- Yuru Ge
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research, Dresden, Germany
- Leibniz IFW Dresden, Institute for Metallic Materials, Dresden, Germany
- Faculty of Mechanical Science and Engineering, TU Dresden, Dresden, Germany
- Faculty of Natural Sciences, TU Chemnitz, Chemnitz, Germany
| | - Klara Lünser
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research, Dresden, Germany
- Leibniz IFW Dresden, Institute for Metallic Materials, Dresden, Germany
- Faculty of Mechanical Science and Engineering, TU Dresden, Dresden, Germany
| | - Fabian Ganss
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research, Dresden, Germany
| | - Peter Gaal
- Leibniz-Institut für Kristallzüchtung (IKZ), Berlin, Germany
- TXproducts UG, Hamburg, Germany
| | - Lukas Fink
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research, Dresden, Germany
- Leibniz IFW Dresden, Institute for Metallic Materials, Dresden, Germany
- Faculty of Mechanical Science and Engineering, TU Dresden, Dresden, Germany
| | - Sebastian Fähler
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research, Dresden, Germany
- Leibniz IFW Dresden, Institute for Metallic Materials, Dresden, Germany
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Chiu WT, Watanabe Y, Tahara M, Inamura T, Hosoda H. Investigations of Shape Deformation Behaviors of the Ferromagnetic Ni-Mn-Ga Alloy/Porous Silicone Rubber Composite towards Actuator Applications. MICROMACHINES 2023; 14:1604. [PMID: 37630140 PMCID: PMC10456531 DOI: 10.3390/mi14081604] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2023] [Revised: 08/09/2023] [Accepted: 08/12/2023] [Indexed: 08/27/2023]
Abstract
Ferromagnetic shape memory alloys (FSMAs), which are potential candidates for future technologies (i.e., actuators in robots), have been paid much attention for their high work per volume and rapid response as external stimulation, such as a magnetic field, is imposed. Among all the FSMAs, the Ni-Mn-Ga-based alloys were considered promising materials due to their appropriate phase transformation temperatures and ferromagnetism. Nevertheless, their intrinsic embrittlement issue and sluggish twin motion due to the inhibition of grain boundaries restrict their practicability. This study took advantage of the single-crystal Ni-Mn-Ga cube/silicone rubber composite materials to solve the two aforementioned difficulties. The single-crystal Ni-Mn-Ga cube was prepared by using a high-temperature alloying procedure and a floating-zone (FZ) method, and the cubes were verified to be the near-{100}p Ni-Mn-Ga alloy. Various room temperature (RT) curing silicone rubbers were utilized as matrix materials. Furthermore, polystyrene foam particles (PFP) were used to provide pores, allowing a porous silicone rubber matrix. It was found that the elastic modulus of the silicone rubber was successfully reduced by introducing the PFP. Additionally, the magnetic field-induced martensite variant reorientation (MVR) was greatly enhanced by introducing a porous structure into the silicone rubber. The single-crystal Ni-Mn-Ga cube/porous silicone rubber composite materials are considered to be promising materials for applications in actuators.
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Affiliation(s)
- Wan-Ting Chiu
- Institute of Innovative Research (IIR), Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan; (Y.W.); (M.T.); (T.I.); (H.H.)
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8
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Ito T, Xu X, Miyake A, Kinoshita Y, Nagasako M, Takahashi K, Omori T, Tokunaga M, Kainuma R. Pd 2 MnGa Metamagnetic Shape Memory Alloy with Small Energy Loss. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2023; 10:e2207779. [PMID: 37309306 PMCID: PMC10427369 DOI: 10.1002/advs.202207779] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2023] [Revised: 05/02/2023] [Indexed: 06/14/2023]
Abstract
Metamagnetic shape memory alloys (MMSMAs) are attractive functional materials owing to their unique properties such as magnetostrain, magnetoresistance, and the magnetocaloric effect caused by magnetic-field-induced transitions. However, the energy loss during the martensitic transformation, that is, the dissipation energy, Edis , is sometimes large for these alloys, which limits their applications. In this paper, a new Pd2 MnGa Heusler-type MMSMA with an extremely small Edis and hysteresis is reported. The microstructures, crystal structures, magnetic properties, martensitic transformations, and magnetic-field-induced strain of aged Pd2 MnGa alloys are investigated. A martensitic transformation from L21 to 10M structures is seen at 127.4 K with a small thermal hysteresis of 1.3 K. The reverse martensitic transformation is induced by applying a magnetic field with a small Edis (= 0.3 J mol-1 only) and a small magnetic-field hysteresis (= 7 kOe) at 120 K. The low values of Edis and the hysteresis may be attributed to good lattice compatibility in the martensitic transformation. A large magnetic-field-induced strain of 0.26% is recorded, indicating the proposed MMSMA's potential as an actuator. The Pd2 MnGa alloy with low values of Edis and hysteresis may enable new possibilities for high-efficiency MMSMAs.
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Affiliation(s)
- Tatsuya Ito
- Department of Materials ScienceGraduate School of EngineeringTohoku UniversityAoba‐yama 6‐6‐02Sendai980‐8579Japan
- Present address:
J‐PARC CenterJapan Atomic Energy AgencyShirakata 2‐4Tokai319‐1195Japan
| | - Xiao Xu
- Department of Materials ScienceGraduate School of EngineeringTohoku UniversityAoba‐yama 6‐6‐02Sendai980‐8579Japan
- Organization for Advanced StudiesTohoku UniversityKatahira 2‐1‐1Sendai980‐8577Japan
| | - Atsushi Miyake
- The Institute for Solid State PhysicsThe University of TokyoKashiwanoha 5‐1‐5Kashiwa277‐8581Japan
- Present address:
Institute for Materials ResearchTohoku UniversityKatahira 2‐1‐1Sendai980‐8577Japan
| | - Yuto Kinoshita
- The Institute for Solid State PhysicsThe University of TokyoKashiwanoha 5‐1‐5Kashiwa277‐8581Japan
| | - Makoto Nagasako
- Institute for Materials ResearchTohoku UniversityKatahira 2‐1‐1Sendai980‐8577Japan
| | - Kohki Takahashi
- Institute for Materials ResearchTohoku UniversityKatahira 2‐1‐1Sendai980‐8577Japan
| | - Toshihiro Omori
- Department of Materials ScienceGraduate School of EngineeringTohoku UniversityAoba‐yama 6‐6‐02Sendai980‐8579Japan
| | - Masashi Tokunaga
- The Institute for Solid State PhysicsThe University of TokyoKashiwanoha 5‐1‐5Kashiwa277‐8581Japan
| | - Ryosuke Kainuma
- Department of Materials ScienceGraduate School of EngineeringTohoku UniversityAoba‐yama 6‐6‐02Sendai980‐8579Japan
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Lapa PN, Kassabian G, Basaran AC, Schuller IK. Detection of electromagnetic phase transitions using a helical cavity susceptometer. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2023; 94:064710. [PMID: 37862535 DOI: 10.1063/5.0136523] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2022] [Accepted: 06/05/2023] [Indexed: 10/22/2023]
Abstract
Fast and sensitive phase transition detection is one of the most important requirements for new material synthesis and characterization. For solid-state samples, microwave absorption techniques can be employed for detecting phase transitions because it simultaneously monitors changes in electronic and magnetic properties. However, microwave absorption techniques require expensive high-frequency microwave equipment and bulky hollow cavities. Due to size limitations in conventional instruments, it is challenging to implement these cavities inside a laboratory cryostat. In this work, we designed and built a susceptometer that consists of a small helical cavity embedded into a custom insert of a commercial cryostat. This cavity resonator operated at sub-GHz frequencies is extremely sensitive to changes in material parameters, such as electrical conductivity, magnetization, and electric and magnetic susceptibilities. To demonstrate its operation, we detected superconducting phase transition in Nb and YBa2Cu3O7-δ, metal-insulator transitions in V2O3, ferromagnetic transition in Gd, and magnetic field induced transformation in meta magnetic NiCoMnIn single crystals. This high sensitivity apparatus allows the detection of trace amounts of materials (10-9-cc) undergoing an electromagnetic transition in a very broad temperature (2-400 K) and magnetic field (up to 90 kOe) ranges.
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Affiliation(s)
- Pavel N Lapa
- Department of Physics and Center for Advanced Nanoscience, University of California San Diego, La Jolla, California 92093, USA
| | - George Kassabian
- Department of Physics and Center for Advanced Nanoscience, University of California San Diego, La Jolla, California 92093, USA
| | - Ali C Basaran
- Department of Physics and Center for Advanced Nanoscience, University of California San Diego, La Jolla, California 92093, USA
| | - Ivan K Schuller
- Department of Physics and Center for Advanced Nanoscience, University of California San Diego, La Jolla, California 92093, USA
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10
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Matyja E, Prusik K, Zubko M, Świec P, Dercz G, Loskot J. Crystallization Kinetics and Structure Evolution during Annealing of Ni-Co-Mn-In Powders Obtained by Mechanical Alloying. MATERIALS (BASEL, SWITZERLAND) 2023; 16:645. [PMID: 36676381 PMCID: PMC9865905 DOI: 10.3390/ma16020645] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/02/2022] [Revised: 01/03/2023] [Accepted: 01/05/2023] [Indexed: 06/17/2023]
Abstract
The crystallization kinetics and structure evolution during annealing of the Ni45.5Co4.5Mn36.6In13.4 (at. %) powders produced by mechanical alloying (MA) was investigated. After 70 h and 100 h of MA, the powder consisted of a mixture of amorphous and nanocrystalline body-centered cubic (bcc) phases. We observed the relaxation in the as-received powder. The relaxation temperature (Tre) increases logarithmically with the annealing time. Annealing above 440 °C results in (1) ordering of L21, (2) dissolution of the residual Ni and Mn, (3) tetragonal MnNi phase formation and (4) γ phases precipitation. The activation energies of the B2 → L21 and Mn (α-Mn) → MnNi (P4/mmm) transformations were calculated.
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Affiliation(s)
- Edyta Matyja
- Institute of Materials Engineering, University of Silesia in Katowice, 41-500 Chorzów, Poland
| | - Krystian Prusik
- Institute of Materials Engineering, University of Silesia in Katowice, 41-500 Chorzów, Poland
| | - Maciej Zubko
- Institute of Materials Engineering, University of Silesia in Katowice, 41-500 Chorzów, Poland
- Department of Physics, Faculty of Science, University of Hradec Králové, 500-03 Hradec Králové, Czech Republic
| | - Paweł Świec
- Institute of Materials Engineering, University of Silesia in Katowice, 41-500 Chorzów, Poland
| | - Grzegorz Dercz
- Institute of Materials Engineering, University of Silesia in Katowice, 41-500 Chorzów, Poland
| | - Jan Loskot
- Department of Physics, Faculty of Science, University of Hradec Králové, 500-03 Hradec Králové, Czech Republic
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Qiang X, Chen L, Jiang X. Achievements and Perspectives on Fe-Based Shape Memory Alloys for Rehabilitation of Reinforced Concrete Bridges: An Overview. MATERIALS (BASEL, SWITZERLAND) 2022; 15:8089. [PMID: 36431574 PMCID: PMC9717741 DOI: 10.3390/ma15228089] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Revised: 11/04/2022] [Accepted: 11/07/2022] [Indexed: 06/16/2023]
Abstract
Reinforced concrete (RC) bridges often face great demands of strengthening or repair during their service life. Fe-based shape memory alloys (Fe-SMAs) as a kind of low-cost smart materials have great potential to enhance civil engineering structures. The stable shape memory effect of Fe-SMAs is generated by, taking Fe-Mn-Si alloys as an example, the martensite transformation of fcc(γ) → hcp(ε) and its reverse transformation which produces considerable recovery stress (400~500 MPa) that can be used as prestress for reinforcement of RC bridges. In this work, the mechanism, techniques, and applications of Fe-SMAs in the reinforcement of RC beams in the past two decades are classified and introduced in detail. Finally, some new perspectives on Fe-SMAs application in civil engineering and their expected evolution are proposed. This paper offers an effective active rehabilitation alternative for the traditional passive strengthening method of RC bridges.
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12
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Samathrakis I, Fortunato N, Singh HK, Shen C, Zhang H. Tunable anomalous Hall and Nernst effects in MM'X compounds. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2022; 51:025703. [PMID: 36322978 DOI: 10.1088/1361-648x/ac9f94] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2022] [Accepted: 11/01/2022] [Indexed: 06/16/2023]
Abstract
Based on first-principles calculations, the anomalous Hall conductivity (AHC) and anomalous Nernst conductivities (ANCs) of the XMnP (X = Ti, Zr, Hf) compounds are evaluated, and the possibility to tailor such properties in compounds susceptible to changing the magnetization directions is also investigated. We observe large changes in the calculated AHC and ANC for different magnetization directions that are originating from changes in the band structure all over the whole Brillouin zone. Our study gives a promising clue on engineering magnetic intermetallic compounds for tunable transverse thermoelectric applications.
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Affiliation(s)
- Ilias Samathrakis
- Institute of Materials Science, TU Darmstadt, 64287 Darmstadt, Germany
| | - Nuno Fortunato
- Institute of Materials Science, TU Darmstadt, 64287 Darmstadt, Germany
| | - Harish K Singh
- Institute of Materials Science, TU Darmstadt, 64287 Darmstadt, Germany
| | - Chen Shen
- Institute of Materials Science, TU Darmstadt, 64287 Darmstadt, Germany
| | - Hongbin Zhang
- Institute of Materials Science, TU Darmstadt, 64287 Darmstadt, Germany
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13
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Schwabe S, Lünser K, Schmidt D, Nielsch K, Gaal P, Fähler S. What is the speed limit of martensitic transformations? SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS 2022; 23:633-641. [PMID: 36212679 PMCID: PMC9542621 DOI: 10.1080/14686996.2022.2128870] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/18/2022] [Revised: 09/20/2022] [Accepted: 09/21/2022] [Indexed: 06/16/2023]
Abstract
Structural martensitic transformations enable various applications, which range from high stroke actuation and sensing to energy efficient magnetocaloric refrigeration and thermomagnetic energy harvesting. All these emerging applications benefit from a fast transformation, but up to now their speed limit has not been explored. Here, we demonstrate that a thermoelastic martensite to austenite transformation can be completed within 10 ns. We heat epitaxial Ni-Mn-Ga films with a nanosecond laser pulse and use synchrotron diffraction to probe the influence of initial temperature and overheating on transformation rate and ratio. We demonstrate that an increase in thermal energy drives this transformation faster. Though the observed speed limit of 2.5 × 1027 (Js)1 per unit cell leaves plenty of room for further acceleration of applications, our analysis reveals that the practical limit will be the energy required for switching. Thus, martensitic transformations obey similar speed limits as in microelectronics, as expressed by the Margolus - Levitin theorem.
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Affiliation(s)
- Stefan Schwabe
- Leibniz IFW Dresden, Institute for Metallic Materials, Dresden, Germany
- TU Dresden, Institute of Materials Science, Dresden, Germany
| | - Klara Lünser
- Leibniz IFW Dresden, Institute for Metallic Materials, Dresden, Germany
- TU Dresden, Institute of Materials Science, Dresden, Germany
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research, Dresden, Germany
| | - Daniel Schmidt
- Department Application Science, Leibniz-Institut für Kristallzüchtung (IKZ), Berlin, Germany
- TXproducts UG, Hamburg, Germany
| | - Kornelius Nielsch
- Leibniz IFW Dresden, Institute for Metallic Materials, Dresden, Germany
- TU Dresden, Institute of Materials Science, Dresden, Germany
| | - Peter Gaal
- Department Application Science, Leibniz-Institut für Kristallzüchtung (IKZ), Berlin, Germany
- TXproducts UG, Hamburg, Germany
| | - Sebastian Fähler
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research, Dresden, Germany
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14
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Xia Q, Tan C, Han B, Tian X, Zhao L, Zhao W, Ma T, Wang C, Zhang K. Strain Engineering in Ni-Co-Mn-Sn Magnetic Shape Memory Alloys: Influence on the Magnetic Properties and Martensitic Transformation. MATERIALS (BASEL, SWITZERLAND) 2022; 15:5889. [PMID: 36079271 PMCID: PMC9457327 DOI: 10.3390/ma15175889] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/16/2022] [Revised: 08/17/2022] [Accepted: 08/23/2022] [Indexed: 06/15/2023]
Abstract
Ni-Mn-Sn ferromagnetic shape memory alloys, which can be stimulated by an external magnetic field, exhibit a fast response and have aroused wide attention. However, the fixed and restricted working temperature range has become a challenge in practical application. Here, we introduced strain engineering, which is an effective strategy to dynamically tune the broad working temperature region of Ni-Co-Mn-Sn alloys. The influence of biaxial strain on the working temperature range of Ni-Co-Mn-Sn alloy was systematically investigated by the ab initio calculation. These calculation results show a wide working temperature range (200 K) in Ni14Co2Mn13Sn3 FSMAs can be achieved with a slight strain from 1.5% to -1.5%, and this wide working temperature range makes Ni14Co2Mn13Sn3 meet the application requirements for both low-temperature and high-temperature (151-356 K) simultaneously. Moreover, strain engineering is demonstrated to be an effective method of tuning martensitic transformation. The strain can enhance the stability of the Ni14Co2Mn13Sn3 martensitic phase. In addition, the effects of strain on the magnetic properties and the martensitic transformation are explained by the electronic structure in Ni14Co2Mn13Sn3 FSMAs.
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Affiliation(s)
- Qinhan Xia
- School of Science, Harbin University of Science and Technology, Harbin 150080, China
| | - Changlong Tan
- School of Science, Harbin University of Science and Technology, Harbin 150080, China
- School of Materials Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150080, China
| | - Binglun Han
- School of Science, Harbin University of Science and Technology, Harbin 150080, China
| | - Xiaohua Tian
- School of Electrical and Electronic Engineering, Harbin University of Science and Technology, Harbin 150080, China
| | - Lei Zhao
- School of Materials Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150080, China
| | - Wenbin Zhao
- School of Materials Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150080, China
| | - Tianyou Ma
- School of Science, Harbin University of Science and Technology, Harbin 150080, China
| | - Cheng Wang
- School of Science, Harbin University of Science and Technology, Harbin 150080, China
| | - Kun Zhang
- School of Science, Harbin University of Science and Technology, Harbin 150080, China
- School of Materials Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150080, China
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
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15
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Joseph J, Ohtsuka M, Miki H, Kohl M. Thermal processes of miniature thermomagnetic generators in resonant self-actuation mode. iScience 2022; 25:104569. [PMID: 35784793 PMCID: PMC9240798 DOI: 10.1016/j.isci.2022.104569] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2022] [Revised: 05/12/2022] [Accepted: 06/05/2022] [Indexed: 11/17/2022] Open
Abstract
This paper presents an investigation of the heat transfer processes in miniature thermomagnetic generators (TMGs) that are based on the recently developed concept of resonant self-actuation of a cantilever enabling efficient conversion of thermal into electrical energy. A lumped element model (LEM) is introduced to describe the dynamics of heat intake during mechanical contact between a thermomagnetic (TM) film and heat source, and of heat dissipation. The key parameters governing heat intake and dissipation are the heat transfer coefficient at contact and the thermal resistance Rb of the bonding layer between TM film and cantilever, respectively. The effects of these parameters on the performance metrics are investigated for different heat source temperatures above the Curie temperature of the TM film. LEM simulations reveal critical values of κ and Rb, above which stable performance of energy generation occurs characterized by large stroke and frequency resulting in large power. Resonant self-actuation enables efficient thermomagnetic energy conversion A minimum temperature change (ΔT, here:6K) is required for resonant self-actuation Heat intake and ΔT strongly decrease below a critical heat transfer coefficient Low thermal resistance reduces heat dissipation and thus ΔT
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16
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The concentration effects on structural and magnetic properties of Fe2V1-xMnxGe Heusler alloys. SN APPLIED SCIENCES 2022. [DOI: 10.1007/s42452-022-05081-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022] Open
Abstract
AbstractThis study presents the concentration-dependent structural, morphological, and magnetic properties of Fe2V1-xMnxGe Heusler alloys (x = 0.0, 0.25, and 0.50) have not been studied previously in the literature, and are investigated by using X-ray Diffractometer, Scanning Electron Microscope (SEM), and Physical Properties Measurement System (PPMS). We observed from the X-ray diffraction measurements that (except x = 0) Fe2V1-xMnxGe samples have had L21-type crystal structure, matching well with the literature. In all SEM images, some holes and crack-type formations are observed. Increasing Mn content in Fe2V1-xMnxGe Heusler alloys can effectively inhibit grain boundary migration. Except for Fe2VGe, the other alloys in the series are investigated to be soft ferromagnets at 5 K with saturation magnetic moment. The (M-H) graphs especially for Fe2V0.75Mn0.25Ge and Fe2V0.5Mn0.5Ge measured at 5 K reveal almost no coercive fields and easy magnetization. Namely, the system easily saturates without needing any high fields. The obtained results show that these new samples may be suitable candidates for technological applications.
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17
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Kinoshita Y, Miyakawa T, Xu X, Tokunaga M. Long-distance polarizing microscope system combined with solenoid-type magnet for microscopy and simultaneous measurement of physical parameters. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2022; 93:073702. [PMID: 35922319 DOI: 10.1063/5.0094747] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2022] [Accepted: 06/17/2022] [Indexed: 06/15/2023]
Abstract
We have developed a long-distance polarizing microscope system combined with a solenoid-type superconducting magnet. By inserting an infinity-corrected objective lens into the magnet, direct or polarizing microscope images are observed in magnetic fields of up to 12 T at various temperatures down to 2 K. Through magneto-optical measurements in the transmission geometry, the local magnetization process of a transparent magnet is evaluated in areas of 10 × 10 µm2. This system enables simultaneous measurements of other physical properties over a wide range of temperatures and magnetic fields. The basic principle of the proposed long-distance microscopy can be applied to imaging experiments in various research fields, particularly biology and chemistry.
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Affiliation(s)
- Y Kinoshita
- The Institute for Solid State Physics, The University of Tokyo, Chiba 277-8581, Japan
| | - T Miyakawa
- Department of Materials Science, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan
| | - X Xu
- Department of Materials Science, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan
| | - M Tokunaga
- The Institute for Solid State Physics, The University of Tokyo, Chiba 277-8581, Japan
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18
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Samatham SS, Patel A, Mishra AK, Lukoyanov AV, Gramateeva LN, Lakhani A, Vedachalaiyer G, Gopinatha Warrier SK. Experimental and Theoretical Investigations of Fe-Doped Hexagonal MnNiGe. ACS OMEGA 2022; 7:18110-18121. [PMID: 35664626 PMCID: PMC9161421 DOI: 10.1021/acsomega.2c01571] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/19/2022] [Accepted: 05/05/2022] [Indexed: 06/15/2023]
Abstract
We report a comprehensive investigation of MnNi0.7Fe0.3Ge Heusler alloy to explore its magnetic, caloric, and electrical transport properties. The alloy undergoes a ferromagnetic transition across T C ∼ 212 K and a weak-antiferromagnetic transition across T t ∼ 180 K followed by a spin-glass transition below T f ∼ 51.85 K. A second-order phase transition across T C with mixed short and long-range magnetic interactions is confirmed through the critical exponent study and universal scaling of magnetic entropy and magnetoresistance. A weak first-order phase transition is evident across T t from magnetization and specific heat data. The frequency dependent cusp in χAC(T) along with the absence of a clear magnetic transition in specific heat C(T) and resistivity ρ(T) establish the spin glass behavior below T f. Mixed ferromagnetic and antiferromagnetic interactions with dominant ferromagnetic coupling, as revealed by density functional calculations, are experimentally evident from the large positive Weiss temperature, magnetic saturation, and negative magnetic-entropy and magnetoresistance.
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Affiliation(s)
- S. Shanmukharao Samatham
- Department
of Physics, Chaitanya Bharathi Institute
of Technology, Gandipet, Hyderabad 500075, India
| | - Akhilesh
Kumar Patel
- Magnetic
Materials Laboratory, Department of Physics, Indian Institute of Technology Bombay, Powai, Mumbai 400 076, India
| | - Ashish Kumar Mishra
- UGC-DAE
Consortium for Scientific Research, University Campus, Khandwa Road, Indore 452001, Madhya
Pradesh, India
| | - Alexey V. Lukoyanov
- M.
N. Miheev Institute of Metal Physics of Ural Branch of Russian Academy
of Sciences, 620108 Ekaterinburg, Russia
- Ural
Federal University, 620002 Ekaterinburg, Russia
| | - Lyubov N. Gramateeva
- M.
N. Miheev Institute of Metal Physics of Ural Branch of Russian Academy
of Sciences, 620108 Ekaterinburg, Russia
| | - Archana Lakhani
- UGC-DAE
Consortium for Scientific Research, University Campus, Khandwa Road, Indore 452001, Madhya
Pradesh, India
| | - Ganesan Vedachalaiyer
- UGC-DAE
Consortium for Scientific Research, University Campus, Khandwa Road, Indore 452001, Madhya
Pradesh, India
- Medi-Caps
University, A.B. Road,
Pigdamber, Rau, Indore 453331, Madhya Pradesh, India
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19
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Sahoo SD, Ravikumar A, Prasad E. PVA–Polystyrene-Based Polymer Films with Water-Induced Shape-Memory Effect. Ind Eng Chem Res 2022. [DOI: 10.1021/acs.iecr.1c04812] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | - Akhil Ravikumar
- Department of Biotechnology, Bhupat and Jyoti Mehta School of Biosciences, Indian Institute of Technology Madras (IITM), Chennai 600036, India
| | - Edamana Prasad
- Department of Chemistry, Indian Institute of Technology Madras (IITM), Chennai 600 036, India
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20
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Du Y, Zhang C, Lu Y, Li J, Cheng G, Wang J, Rao G. Observation of table-like magnetocaloric effect and large refrigerant capacity in Nd6Fe13Pd1–Cu compounds. J RARE EARTH 2022. [DOI: 10.1016/j.jre.2021.03.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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21
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Enhanced Magnetostrain in a <0 0 1>A-Textured Ni44.5Co4.9Mn37.5In13.1 Alloy through Superelastic Training. MATERIALS 2022; 15:ma15062072. [PMID: 35329524 PMCID: PMC8953679 DOI: 10.3390/ma15062072] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/16/2022] [Revised: 03/07/2022] [Accepted: 03/09/2022] [Indexed: 12/10/2022]
Abstract
Large magnetostrain can be demonstrated in Ni-Mn-X (X = In, Sn, Sb) meta-magnetic shape memory alloys by resuming the predeformed martensite through magnetic-field-induced reverse martensitic transformation. However, owing to the constraint from the self-accommodated microstructure and randomly distributed crystallographic orientation, spontaneous magnetostrain without predeformation in polycrystalline alloys remains low. Here, by combining microstructure texturing and superelastic training, enhanced spontaneous magnetostrain was achieved in a directionally solidified Ni44.5Co4.9Mn37.5In13.1 alloy with strong <0 0 1>A preferred orientation. After superelastic training through cyclic compressive loading/unloading on the directionally solidified alloy, a large spontaneous magnetostrain of ~0.65% was obtained by applying a magnetic field of 5 T, showing great improvement when compared to that of the untrained situation, i.e., ~0.45%. Such enhanced magnetoresponse is attributed to the internal stress generated through superelastic training, which affects the variant distribution and the resultant output strain in association with the martensitic transformation.
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22
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Yang B, Li Z, Yan H, Zhang Y, Esling C, Zhao X, Zuo L. Crystallography and Microstructure of 7M Martensite in Ni-Mn-Ga Thin Films Epitaxially Grown on (1 1 2¯ 0)-Oriented Al 2O 3 Substrate. MATERIALS 2022; 15:ma15051916. [PMID: 35269146 PMCID: PMC8911683 DOI: 10.3390/ma15051916] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/31/2021] [Revised: 02/22/2022] [Accepted: 03/03/2022] [Indexed: 12/10/2022]
Abstract
Epitaxial Ni-Mn-Ga thin films have been extensively investigated, due to their potential applications in magnetic micro-electro-mechanical systems. It has been proposed that the martensitic phase in the <1 1 0>A-oriented film is much more stable than that in the <1 0 0>A-oriented film. Nevertheless, the magnetic properties, microstructural features, and crystal structures of martensite in such films have not been fully revealed. In this work, the <1 1 0>A-oriented Ni51.0Mn27.5Ga21.5 films with different thicknesses were prepared by epitaxially growing on Al2O3(1 1 2¯ 0) substrate by magnetron sputtering. The characterization by X-ray diffraction technique and transmission electron microscopy revealed that all the Ni51.0Mn27.5Ga21.5 films are of 7M martensite at the ambient temperature, with their Type-I and Type-II twinning interfaces nearly parallel to the substrate surface.
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Affiliation(s)
- Bo Yang
- Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Material Science and Engineering, Northeastern University, Shenyang 110819, China; (B.Y.); (Z.L.); (H.Y.); (X.Z.)
| | - Zongbin Li
- Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Material Science and Engineering, Northeastern University, Shenyang 110819, China; (B.Y.); (Z.L.); (H.Y.); (X.Z.)
| | - Haile Yan
- Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Material Science and Engineering, Northeastern University, Shenyang 110819, China; (B.Y.); (Z.L.); (H.Y.); (X.Z.)
| | - Yudong Zhang
- Laboratoire d’Étude des Microstructures et de Mécanique des Matériaux (LEM3), CNRS UMR 7239, Université de Lorraine, CEDEX, 57045 Metz, France; (Y.Z.); (C.E.)
- Laboratory of Excellence on Design of Alloy Metals for Low-mAss Structures (DAMAS), Université de Lorraine, CEDEX, 57045 Metz, France
| | - Claude Esling
- Laboratoire d’Étude des Microstructures et de Mécanique des Matériaux (LEM3), CNRS UMR 7239, Université de Lorraine, CEDEX, 57045 Metz, France; (Y.Z.); (C.E.)
- Laboratory of Excellence on Design of Alloy Metals for Low-mAss Structures (DAMAS), Université de Lorraine, CEDEX, 57045 Metz, France
| | - Xiang Zhao
- Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Material Science and Engineering, Northeastern University, Shenyang 110819, China; (B.Y.); (Z.L.); (H.Y.); (X.Z.)
| | - Liang Zuo
- Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Material Science and Engineering, Northeastern University, Shenyang 110819, China; (B.Y.); (Z.L.); (H.Y.); (X.Z.)
- Correspondence:
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23
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Sun S, Qin H, Kong L, Ning R, Zhao Y, Gao Z, Cai W. Defect Engineering: Electron-Exchange Integral Manipulation to Generate a Large Magnetocaloric Effect in Ni 41Mn 43Co 6Sn 10 Alloys. ACS APPLIED MATERIALS & INTERFACES 2021; 13:57372-57379. [PMID: 34807560 DOI: 10.1021/acsami.1c18587] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
A promising magnetocaloric effect has been obtained in Ni-(Co)-Mn-X (X = Sn, In, Sb)-based Heusler alloys, but the low isothermal magnetic entropy change ΔSM restricts the further promotion of such materials. Defect engineering is a useful method to modulate magnetic performance and shows great potential in improving the magnetocaloric effect. In this work, dense Ni vacancies are introduced in Ni41Mn43Co6Sn10 alloys by employing high-energy electron irradiation to adjust the magnetic properties. These vacancies bring about intense lattice distortion to change the distance between adjacent magnetic atoms, leading to a significant enhancement of the average magnetic moment. As a result, the saturation magnetization of ferromagnetic austenite is accordingly improved to generate a high isothermal magnetic entropy change ΔSM of 20.0 J/(kg K) at a very low magnetic field of ∼2 T.
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Affiliation(s)
- Sibo Sun
- National Key Laboratory of Materials Behavior & Evaluation Technology in Space Environment, Harbin Institute of Technology, Harbin 150001, China
| | - Haixu Qin
- National Key Laboratory of Materials Behavior & Evaluation Technology in Space Environment, Harbin Institute of Technology, Harbin 150001, China
| | - Lingjiao Kong
- National Key Laboratory of Materials Behavior & Evaluation Technology in Space Environment, Harbin Institute of Technology, Harbin 150001, China
| | - Rui Ning
- National Key Laboratory of Materials Behavior & Evaluation Technology in Space Environment, Harbin Institute of Technology, Harbin 150001, China
| | - Yundong Zhao
- National Key Laboratory of Materials Behavior & Evaluation Technology in Space Environment, Harbin Institute of Technology, Harbin 150001, China
| | - Zhiyong Gao
- National Key Laboratory of Materials Behavior & Evaluation Technology in Space Environment, Harbin Institute of Technology, Harbin 150001, China
| | - Wei Cai
- National Key Laboratory of Materials Behavior & Evaluation Technology in Space Environment, Harbin Institute of Technology, Harbin 150001, China
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24
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Modulating the electrochemical capacitance of NiFe2O4 by an external magnetic field for energy storage application. J Electroanal Chem (Lausanne) 2021. [DOI: 10.1016/j.jelechem.2021.115758] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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25
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Chatterjee S, Chatterjee S, Giri S, Majumdar S. Transport properties of Heusler compounds and alloys. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2021; 34:013001. [PMID: 34521079 DOI: 10.1088/1361-648x/ac268c] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2021] [Accepted: 09/14/2021] [Indexed: 06/13/2023]
Abstract
Heusler compounds are a large group of intermetallic compositions with versatile material properties. In recent times, they are found to be important for their practical applications in the fields of spintronics and shape memory effect. Interestingly, their physical properties can be easily tuned by varying the valence electron concentration through proper doping and substitution. Empirical laws concerning the valence electron concentration, such as Slater-Pauling or Hume-Rothery rules are found to be useful in predicting their electronic, magnetic and structural properties quite accurately. Electrical transport measurements are simple laboratory-based techniques to gather a handful of information on the electronic properties of metals and semiconductors. The present review aimed to provide a comprehensive view of the transport in 3dand 4dtransition metal-based bulk Heusler compositions. The main emphasis is given on resistivity, magnetoresistance, Hall effect, thermopower and spin-dependent transport in spintronics devices. The review primarily focuses on magnetic Heusler compounds and alloys, albeit it also addresses several non-magnetic materials showing superconductivity or large thermopower.
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Affiliation(s)
- Snehashish Chatterjee
- School of Physical Sciences, Indian Association for the Cultivation of Science, 2A & B Raja S. C. Mullick Road, Jadavpur, Kolkata 700 032, India
| | - Souvik Chatterjee
- UGC-DAE Consortium for Scientific Research, Kolkata Centre, Sector III, LB-8, Salt Lake, Kolkata 700106, India
| | - Saurav Giri
- School of Physical Sciences, Indian Association for the Cultivation of Science, 2A & B Raja S. C. Mullick Road, Jadavpur, Kolkata 700 032, India
| | - Subham Majumdar
- School of Physical Sciences, Indian Association for the Cultivation of Science, 2A & B Raja S. C. Mullick Road, Jadavpur, Kolkata 700 032, India
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26
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Superconductivity in LiGa 2Ir Heusler type compound with VEC = 16. Sci Rep 2021; 11:16517. [PMID: 34389763 PMCID: PMC8363667 DOI: 10.1038/s41598-021-95944-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2021] [Accepted: 07/27/2021] [Indexed: 02/07/2023] Open
Abstract
Polycrystalline LiGa2Ir has been prepared by a solid state reaction method. A Rietveld refinement of powder x-ray diffraction data confirms a previously reported Heusler-type crystal structure (space group Fm-3m, No. 225) with lattice parameter a = 6.0322(1) Å. The normal and superconducting state properties were studied by magnetic susceptibility, heat capacity, and electrical resistivity techniques. A bulk superconductivity with Tc = 2.94 K was confirmed by detailed heat capacity studies. The measurements indicate that LiGa2Ir is a weak-coupling type-II superconductor ([Formula: see text]e-p = 0.57, [Formula: see text]C/[Formula: see text]Tc = 1.4). Electronic structure, lattice dynamics, and the electron-phonon interaction are studied from first principles calculations. Ir and two Ga atoms equally contribute to the Fermi surface with a minor contribution from Li. The phonon spectrum contains separated high frequency Li modes, which are seen clearly as an Einstein-like contribution in the specific heat. The calculated electron-phonon coupling constant [Formula: see text]e-p = 0.68 confirms the electron-phonon mechanism for the superconductivity. LiGa2Ir and recently reported isoelectronic LiGa2Rh are the only two known representatives of the Heusler superconductors with the valence electron count VEC = 16.
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Macovei D, Tolea F. Long- and short-range order in the Ni 52Co 2Fe 20Ga 26 ferromagnetic Heusler alloy. J Appl Crystallogr 2021. [DOI: 10.1107/s1600576721006415] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023] Open
Abstract
The crystalline structure and Fe local environment in a Co-doped Ni–Fe–Ga Heusler alloy, prepared by the melt-spinning technique, were investigated by X-ray diffraction (XRD) and EXAFS at room and low temperatures. The characteristic temperatures of the austenite–martensite phase transitions were determined by differential scanning calorimetry via cooling and heating cycles of the alloy ribbons. As shown by room-temperature XRD, the austenitic phase of the alloy has the chemically ordered L21 Heusler structure. This was confirmed by EXAFS, although this technique was not able to conclusively distinguish between the L21 and B2 structures of the austenite for the analyzed alloy. The low-temperature martensitic phase and its structural evolution towards austenite with increasing temperature were studied by high-energy X-ray diffraction, which evinced the martensite modulation. However, the Fe environment could be fitted by EXAFS with the tetragonal L10 structure of the non-modulated martensite. This proves that the martensite modulation has structural effects on a long-range scale, without significant changes in the short-range order around the atoms. The changes in the local structure around iron on martensitic transformation were correlated with changes in the electronic structure, described by XANES spectroscopy at the Fe K edge.
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Ling Y, Hu Y, Wang H, Niu B, Chen J, Liu R, Yuan Y, Wang G, Wu D, Xu M, Han Z, Du J, Xu Q. Strain Control of Phase Transition and Exchange Bias in Flexible Heusler Alloy Thin Films. ACS APPLIED MATERIALS & INTERFACES 2021; 13:24285-24294. [PMID: 33988027 DOI: 10.1021/acsami.1c03701] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The practical applications for the distinctive functions of metamagnetic Heusler alloys, such as magnetic shape memory effect, various caloric effects, etc., strongly depend on the phase transition temperatures. Here, flexible Heusler alloy Ni-Mn-Sn films have been deposited on mica substrates by pulsed laser deposition with a Ti buffer layer. Clear ferromagnetic (FM) transition followed by the martensitic transformation at around room temperature and exchange bias (EB) with a blocking temperature of 70 K are observed. Under the application of both tensile and compressive strains by bending the mica substrates, all the characteristic temperatures of Ni-Mn-Sn films, including the FM transition temperature, martensitic transformation temperature, and blocking temperature of EB, are significantly increased by about 10 K. Furthermore, EB field and coercivity are both strongly strengthened, which is mainly caused by the simultaneous enhancement of FM and anti-FM Mn-Mn coupling because of their shortened separations by strain and verified by the Monte Carlo simulation results. The strain controlling for structural and magnetic properties provides efficient manipulation for Heusler alloy-based magnetic devices.
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Affiliation(s)
- Yechao Ling
- School of Physics, Southeast University, Nanjing 211189, China
| | - Yong Hu
- Department of Physics, College of Sciences, Northeastern University, Shenyang 110819, China
| | - Haobo Wang
- Department of Physics, Changshu Institute of Technology, Changshu 215500, China
| | - Ben Niu
- National Laboratory of Solid State Microstructures, Department of Materials Science and Engineering, Jiangsu Key Laboratory for Artificial Functional Materials, Nanjing University, Nanjing 210093, China
| | - Jiawei Chen
- School of Physics, Southeast University, Nanjing 211189, China
| | - Ruobai Liu
- Department of Physics, Nanjing University, Nanjing 210093, China
| | - Yuan Yuan
- Department of Physics, Nanjing University, Nanjing 210093, China
| | - Guangyu Wang
- School of Physics, Southeast University, Nanjing 211189, China
| | - Di Wu
- National Laboratory of Solid State Microstructures, Department of Materials Science and Engineering, Jiangsu Key Laboratory for Artificial Functional Materials, Nanjing University, Nanjing 210093, China
- National Laboratory of Solid State Microstructures, Nanjing 210008, China
| | - Mingxiang Xu
- School of Physics, Southeast University, Nanjing 211189, China
| | - Zhida Han
- Department of Physics, Changshu Institute of Technology, Changshu 215500, China
| | - Jun Du
- Department of Physics, Nanjing University, Nanjing 210093, China
- National Laboratory of Solid State Microstructures, Nanjing 210008, China
| | - Qingyu Xu
- School of Physics, Southeast University, Nanjing 211189, China
- National Laboratory of Solid State Microstructures, Nanjing 210008, China
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Full Variation of Site Substitution in Ni-Mn-Ga by Ferromagnetic Transition Metals. METALS 2021. [DOI: 10.3390/met11060850] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Systematic doping by transition elements Fe, Co and Ni on each site of Ni2MnGa alloy reveal that in bulk material the increase in martensitic transformation temperature is usually accompanied by the decrease in ferromagnetic Curie temperature, and vice versa. The highest martensitic transformation temperature (571 K) was found for Ni50.0Mn25.4(Ga20.3Ni4.3) with the result of a reduction in Curie temperature by 55 K. The highest Curie point (444 K) was found in alloy (Ni44.9Co5.1)Mn25.1Ga24.9; however, the transition temperature was reduced to 77 K. The dependence of transition temperature is better scaled with the Ne/a parameter (number of non-bonding electrons per atom) compared to usual e/a (valence electrons per atom). Ne/a dependence predicts a disappearance of martensitic transformation in (Ni45.3Fe5.3)Mn23.8Ga25.6, in agreement with our experiment. Although Curie temperature usually slightly decreases while the martensitic transition increases, there is no significant correlation of Curie temperature with e/a or Ne/a parameters. The doping effect of the same element is different for each compositional site. The cascade substitution is discussed and related to the experimental data.
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Grain Size Effect of the γ Phase Precipitation on Martensitic Transformation and Mechanical Properties of Ni-Mn-Sn-Fe Heusler Alloys. MATERIALS 2021; 14:ma14092339. [PMID: 33946375 PMCID: PMC8125746 DOI: 10.3390/ma14092339] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Revised: 04/27/2021] [Accepted: 04/27/2021] [Indexed: 11/16/2022]
Abstract
Isothermal annealing of a eutectic dual phase Ni-Mn-Sn-Fe alloy was carried out to encourage grain growth and investigate the effects of grain size of the γ phase on the martensitic transformation behaviour and mechanical properties of the alloy. It is found that with the increase of the annealing time, the grain size and volume fraction of the γ phase both increased with the annealing time predominantly by the inter-diffusion of Fe and Sn elements between the γ phase and the Heusler matrix. The isothermal anneals resulted in the decrease of the e/a ratio and suppression of the martensitic transformation of the matrix phase. The fine γ phase microstructure with an average grain size of 0.31 μm showed higher fracture strength and ductility values by 28% and 77% compared to the coarse-grained counterpart with an average grain size of 3.31 μm. The fine dual phase microstructure shows a quasi-linear superelasticity of 4.2% and very small stress hysteresis during cyclic loading, while the coarse dual phase counterpart presents degraded superelasticity of 2.6% and large stress hysteresis. These findings indicate that grain size refinement of the γ phase is an effective approach in improving the mechanical and transformation properties of dual phase Heusler alloys.
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Joseph J, Ohtsuka M, Miki H, Kohl M. Lumped Element Model for Thermomagnetic Generators Based on Magnetic SMA Films. MATERIALS 2021; 14:ma14051234. [PMID: 33807906 PMCID: PMC7961915 DOI: 10.3390/ma14051234] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/18/2020] [Revised: 02/26/2021] [Accepted: 03/02/2021] [Indexed: 12/02/2022]
Abstract
This paper presents a lumped element model (LEM) to describe the coupled dynamic properties of thermomagnetic generators (TMGs) based on magnetic shape memory alloy (MSMA) films. The TMG generators make use of the concept of resonant self-actuation of a freely movable cantilever, caused by a large abrupt temperature-dependent change of magnetization and rapid heat transfer inherent to the MSMA films. The LEM is validated for the case of a Ni-Mn-Ga film with Curie temperature TC of 375 K. For a heat source temperature of 443 K, the maximum power generated is 3.1 µW corresponding to a power density with respect to the active material’s volume of 80 mW/cm3. Corresponding LEM simulations allow for a detailed study of the time-resolved temperature change of the MSMA film, the change of magnetic field at the position of the film and of the corresponding film magnetization. Resonant self-actuation is observed at 114 Hz, while rapid temperature changes of about 10 K occur within 1 ms during mechanical contact between heat source and Ni-Mn-Ga film. The LEM is used to estimate the effect of decreasing TC on the lower limit of heat source temperature in order to predict possible routes towards waste heat recovery near room temperature.
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Affiliation(s)
- Joel Joseph
- Institute of Microstructure Technology, Karlsruhe Institute of Technology (KIT), Postfach 3640, D-76021 Karlsruhe, Germany;
| | - Makoto Ohtsuka
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan;
| | - Hiroyuki Miki
- Institute of Fluid Science, Tohoku University, Sendai 980-8577, Japan;
| | - Manfred Kohl
- Institute of Microstructure Technology, Karlsruhe Institute of Technology (KIT), Postfach 3640, D-76021 Karlsruhe, Germany;
- Correspondence:
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32
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Seth S, Jhulki S. Porous flexible frameworks: origins of flexibility and applications. MATERIALS HORIZONS 2021; 8:700-727. [PMID: 34821313 DOI: 10.1039/d0mh01710h] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Porous crystalline frameworks including zeolites, metal-organic frameworks (MOFs), covalent organic frameworks (COFs) and hydrogen-bonded organic frameworks (HOFs) have attracted great research interest in recent years. In addition to their assembly in the solid-state being fundamentally interesting and aesthetically pleasing, their potential applications have now pervaded in different areas of chemistry, biology and materials science. When framework materials are endowed with 'flexibility', they exhibit some properties (e.g., stimuli-induced pore breathing and reversible phase transformations) that are distinct from their rigid counterparts. Benefiting from flexibility and porosity, these framework materials have shown promise in applications that include separation of toxic chemicals, isotopes and hydrocarbons, sensing, and targeted delivery of chemicals. While flexibility in MOFs has been widely appreciated, recent developments of COFs and HOFs have established that flexibility is not just limited to MOFs. In fact, zeolites-that are considered rigid when compared with MOFs-are also known to exhibit dynamic modes. Despite flexibility may be conceived as being detrimental to the formation and stability of periodic structures, the landscape of flexible framework structures continues to expand with discovery of new materials with promising applications. In this review, we make an account of different flexible framework materials based on their framework types with a more focus on recent examples and delve into the origin of flexibility in each case. This systematic analysis of different flexibility types based on their origins enables understanding of structure-property relationships, which should help guide future development of flexible framework materials based on appropriate monomer design and tailoring their properties by bottom-up approach. In essence, this review provides a summary of different flexibility types extant to framework materials and critical analysis of importance of flexibility in emerging applications.
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Affiliation(s)
- Saona Seth
- Department of Applied Sciences, Tezpur University, Napaam, Assam 784028, India.
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33
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Martensitic Transformation and Metamagnetic Transition in Co-V-(Si, Al) Heusler Alloys. METALS 2021. [DOI: 10.3390/met11020226] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
This study investigates the crystal structure, martensitic transformation behavior, magnetic properties, and magnetic-field-induced reverse martensitic transformation of Co64V15(Si21–xAlx) alloys. It was found that by increasing the Al composition, the microstructure changes from the martensite phase to the parent phase. The crystal structures of the martensite and parent phases were determined as D022 and L21, respectively. Thermoanalysis and thermomagnetization measurements were used to determine the martensitic transformation and Curie temperatures. Both the ferromagnetic state of the parent phase and that of the martensite phase were observed. With the increasing Al contents, the martensitic transformation temperatures decrease, whereas the Curie temperatures of both the martensite and parent phases increase. The spontaneous magnetization and its composition dependence were also determined. The magnetic-field-induced reverse martensitic transformation of a Co64V15Si7Al14 alloy under pulsed high magnetic fields was observed. Moreover, using the results of the DSC measurements and the pulsed high magnetization measurements, the temperature dependence of the transformation entropy change of the Co-V-Si-Al alloys was estimated.
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Sasaki T, Ranjan S, Takamizawa S. A photoluminescent organosuperelastic crystal of 7-amino-4-methylcoumarin. CrystEngComm 2021. [DOI: 10.1039/d1ce00359c] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
A unique mechanical property of superelasticity is observed not only in so-called shape-memory alloys but also in molecular crystals.
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Affiliation(s)
- Toshiyuki Sasaki
- Department of Materials System Science, Graduate School of Nanobioscience, Yokohama City University, 22-2 Seto, Kanazawa-ku, Yokohama, Kanagawa 236-0027, Japan
| | - Subham Ranjan
- Department of Materials System Science, Graduate School of Nanobioscience, Yokohama City University, 22-2 Seto, Kanazawa-ku, Yokohama, Kanagawa 236-0027, Japan
| | - Satoshi Takamizawa
- Department of Materials System Science, Graduate School of Nanobioscience, Yokohama City University, 22-2 Seto, Kanazawa-ku, Yokohama, Kanagawa 236-0027, Japan
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35
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Martensitic Transformation, Thermal Analysis and Magnetocaloric Properties of Ni-Mn-Sn-Pd Alloys. Processes (Basel) 2020. [DOI: 10.3390/pr8121582] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Martensitic transition and magnetic response of Ni50−x Pdx,y Mn36 Sn14−y (x = 0, 1, 2 and y = 0, 1) Heusler alloys were analysed. The crystalline structure of each composition was solved by X-ray diffraction pattern fitting. For x = 1 and 2, the L21 austenite structure is formed and, for y = 1, the crystallographic phase is a modulated martensitic structure. From differential scanning calorimetry scans, we determine characteristic transformation temperatures and the entropy/enthalpy changes. The temperatures of the structural transformation increase with the addition of Pd to replace Ni or Sn, whereas the austenitic Curie temperature remains almost unvarying. In addition, the magneto-structural transition, investigated by magnetic measurements, is adjusted by suitable Pd doping in the alloys. The peak value of the magnetic entropy changes reached 4.5 J/(kg K) for Ni50Mn36Sn13Pd1 (external field: 50 kOe).
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36
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Bruno NM, Yuce S. On the instability of the giant direct magnetocaloric effect in CoMn0.915Fe0.085Ge at. % metamagnetic compounds. Sci Rep 2020; 10:14211. [PMID: 32848195 PMCID: PMC7450048 DOI: 10.1038/s41598-020-71149-w] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2020] [Accepted: 07/20/2020] [Indexed: 11/14/2022] Open
Abstract
The giant magnetocaloric effect was quantified in CoMn1-xFexGe (x = 0.085–0.12) nom. at. % polycrystals across the high temperature hexagonal (P63/mmc) to low temperature orthorhombic (Pnma) phase transition via differential scanning calorimetry (DSC) and multiple (thermo) magnetization measurements. It was found that increasing Fe content led to the decrease of both the martensitic transformation temperature and entropy change (\documentclass[12pt]{minimal}
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\begin{document}$$\Delta S$$\end{document}ΔS) at the point of the phase transition. Moreover, first-time magnetocaloric measurements resulted in irreproducible entropy change versus temperature diagrams, which was attributed to the release of internal pressure in bulk samples that disintegrated into powder upon transformation. CoMn1-xFexGe demonstrated larger magnetic field-induced entropy changes and giant magnetocaloric effect (MCE) compared to other CoMnGe alloys doped with Si, Sn, Ti, and Ga. However, the observed brittleness and apparent change in volume at the magnetic transition was posited to influence the material’s potential for regenerative applications.
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Zhang L, Zhang J, Li K, Zhou C, Yao Y, Tan TT, Wang D, Yang S, Li S, Carpenter MA. Glassy Magnetic Transitions and Accurate Estimation of Magnetocaloric Effect in Ni-Mn Heusler Alloys. ACS APPLIED MATERIALS & INTERFACES 2020; 12:43646-43652. [PMID: 32876430 DOI: 10.1021/acsami.0c11308] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
In this work, the structural and magnetic transitions of Heusler alloy Ni50Mn34In14Ga2 have been carefully studied through measurements of heat flow and magnetization under DC and AC magnetic fields. This alloy undergoes the transition sequence of spin-glassy martensite (SPM) → ferromagnetic austenite (FA) → paramagnetic austenite at ∼225 and ∼305 K, respectively, during heating. Splitting of zero-field-cooling (ZFC)/field-cooling (FC) curves in martensite is caused by the slowdown dynamics of spin glass as evidenced by frequency dispersion and aging effects. The development of a spin-glass state is believed to be the result of strain relaxation and interaction of ferroelastic twin walls in the martensite. The magnetocaloric effect (MCE) at the SPM-FA transition was then measured using indirect, quasi-direct, and direct methods. The MCE magnitudes are controlled by the entropy changes associated with the first-order martensite transition and magnetic ordering of austenite under the magnetic field. The existence of a spin-glass state in martensite can also improve the reversibility of the magnetostructural transitions, which is beneficial for the improvement of the reversibility of associated MCE. These results provide an in-depth understanding of the transitions and magnetic properties of the Ni-Mn Heusler alloys and suggest that the MCE at the first-order magnetostructural transitions estimated solely using indirect methods may need some revision.
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Affiliation(s)
- Le Zhang
- School of Materials Science and Engineering, UNSW Sydney, Sydney, NSW 2052, Australia
| | - Ji Zhang
- School of Materials Science and Engineering, UNSW Sydney, Sydney, NSW 2052, Australia
| | - Kaili Li
- School of Science and MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, Xi'an Jiaotong University, Xi'an 710049, China
| | - Chao Zhou
- School of Science and MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, Xi'an Jiaotong University, Xi'an 710049, China
| | - Yin Yao
- Electron Microscope Unit, Mark Wainwright Analytical Centre, UNSW Sydney, Sydney, NSW 2052, Australia
| | - Thiam Teck Tan
- School of Materials Science and Engineering, UNSW Sydney, Sydney, NSW 2052, Australia
| | - Danyang Wang
- School of Materials Science and Engineering, UNSW Sydney, Sydney, NSW 2052, Australia
| | - Sen Yang
- School of Science and MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, Xi'an Jiaotong University, Xi'an 710049, China
| | - Sean Li
- School of Materials Science and Engineering, UNSW Sydney, Sydney, NSW 2052, Australia
| | - Michael A Carpenter
- Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, United Kingdom
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Nevgi R, Priolkar KR, Righi L, Solzi M, Cugini F, Dias ET, Nigam AK. Lattice strain accommodation and absence of pre-transition phases in Ni 50Mn 25+xIn 25-x. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2020; 32:505801. [PMID: 32985415 DOI: 10.1088/1361-648x/abb17f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2020] [Accepted: 08/21/2020] [Indexed: 06/11/2023]
Abstract
The stoichiometric Ni50Mn25In25Heusler alloy transforms from a stable ferromagnetic austenitic ground state to an incommensurate modulated martensitic ground state with a progressive replacement of In with Mn without any pre-transition phases. The absence of pre-transition phases like strain glass in Ni50Mn25+xIn25-xalloys is explained to be the ability of the ferromagnetic cubic structure to accommodate the lattice strain caused by atomic size differences of In and Mn atoms. Beyond the critical value ofx= 8.75, the alloys undergo martensitic transformation despite the formation of ferromagnetic and antiferromagnetic clusters and the appearance of a super spin glass state.
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Affiliation(s)
- R Nevgi
- Department of Physics, Goa University, Taleigao Plateau, Goa 403206, India
| | - K R Priolkar
- Department of Physics, Goa University, Taleigao Plateau, Goa 403206, India
| | - L Righi
- Department of Chemistry, Parma University, Parco Area delle Scienze 17/a 43124 Parma, Italy
| | - M Solzi
- Department of Mathematical, Physical and Computer Sciences, University of Parma, Parco Area delle Scienze 7/A 43124 Parma, Italy
| | - F Cugini
- Department of Mathematical, Physical and Computer Sciences, University of Parma, Parco Area delle Scienze 7/A 43124 Parma, Italy
| | - E T Dias
- Department of Condensed Matter Physics and Material Science, Tata Institute of Fundamental Research, Colaba, Mumbai 400005, India
| | - A K Nigam
- Department of Condensed Matter Physics and Material Science, Tata Institute of Fundamental Research, Colaba, Mumbai 400005, India
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The Phase Relations of the Co-Ni-In Ternary System at 673 K and 873 K and Magnetic Properties of Their Compounds. MATERIALS 2020; 13:ma13183990. [PMID: 32916900 PMCID: PMC7558481 DOI: 10.3390/ma13183990] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/10/2020] [Revised: 09/03/2020] [Accepted: 09/04/2020] [Indexed: 11/17/2022]
Abstract
The phase relationships of the ternary Co-Ni-In system at 673 K and 873 K were investigated by means of powder X-ray diffraction, scanning electron microscopy equipped with energy dispersive spectroscopy, and optical microscopy. Though CoIn2 does not exist at 873 K, the ternary solid solution Co1-xNixIn2 exists at both 673 K and 873 K with different composition ranges. The Rietveld refinements were carried out to investigate the crystal structure of Co1-xNixIn2 (x = 0.540, and 0.580) and Ni2-xCoxIn3 (x = 0.200). The magnetization dependence of temperature (MT) curves of Ni2-xCoxIn3 (x = 0.200) and Co1-xNixIn2 (x = 0.540) are similar to those of the ferromagnetic shape memory alloys Ni-Mn-A (A = Ga, Sn, and In), but do not undergo martensitic transformation. The maximum magnetic entropy changes in Ni2-xCoxIn3 (x = 0.200) and Co1-xNixIn2 (x = 0.540) under 3T are 1.25 and 1.475 J kg-1K-1, respectively.
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40
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Influence of Structural Defects on the Properties of Metamagnetic Shape Memory Alloys. METALS 2020. [DOI: 10.3390/met10091131] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The production of μ-particles of Metamagnetic Shape Memory Alloys by crushing and subsequent ball milling process has been analyzed. The high energy involved in the milling process induces large internal stresses and high density of defects with a strong influence on the martensitic transformation; the interphase creation and its movement during the martensitic transformation produces frictional contributions to the entropy change (exothermic process) both during forward and reverse transformation. The frictional contribution increases with the milling time as a consequence of the interaction between defects and interphases. The influence of the frictional terms on the magnetocaloric effect has been evidenced. Besides, the presence of antiphase boundaries linked to superdislocations helps to understand the spin-glass behavior at low temperatures in martensite. Finally, the particles in the deformed state were introduced in a photosensitive polymer. The mechanical damping associated to the Martensitic Transformation (MT) of the particles is clearly distinguished in the produced composite, which could be interesting for the development of magnetically-tunable mechanical dampers.
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DFT Investigation on the Electronic, Magnetic, Mechanical Properties and Strain Effects of the Quaternary Compound Cu2FeSnS4. CRYSTALS 2020. [DOI: 10.3390/cryst10060509] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The electronic, magnetic and mechanical properties of the quaternary compound Cu2FeSnS4 have been investigated with first principle calculations. Its half-metallicity has been identified with spin polarized band structures and its magnetic origination is caused by the strong spin splitting effect in the d orbitals of Fe atoms. The total magnetic moment of 4 μB is mainly contributed by the Fe atoms and the spatial distribution of the magnetic spin density and charge density difference have also been examined. Moreover, several mechanical properties of Cu2FeSnS4 have been derived and its mechanical stability is also verified. The directional dependent Young’s modulus exhibits relatively small anisotropy yet the shear modulus shows strong directional anisotropy. At last, the tetragonal strain effects have been evaluated and their impact on the electronic and magnetic properties are provided. Results show the total magnetic moment stays almost unchanged while the half-metallicity can only be maintained under relatively small variations for both strains. This study can provide comprehensive information about the various properties of Cu2FeSnS4 compound and serve as a helpful reference for its future applications.
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Zhang L, Lou X, Zhou C, Yang S, Ren X, Wang D, Carpenter MA. Coupling between phase transitions and glassy magnetic behaviour in Heusler alloy Ni 50Mn 34In 8Ga 8. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2020; 32:325402. [PMID: 32162615 DOI: 10.1088/1361-648x/ab7f04] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2019] [Accepted: 03/11/2020] [Indexed: 06/10/2023]
Abstract
The transition sequence in the Heusler alloy Ni50Mn34In8Ga8has been determined from measurements of elasticity, heat flow and magnetism to be paramagnetic austenite → paramagnetic martensite → ferromagnetic martensite at ∼335 and ∼260 K, respectively, during cooling. The overall pattern of elastic stiffening/softening and acoustic loss is typical of a system with bilinear coupling between symmetry breaking strain and the driving structural/electronic order parameter, and a temperature interval below the transition point in which ferroelastic twin walls remain mobile under the influence of external stress. Divergence between zero-field-cooling and field-cooling determinations of DC magnetisation below ∼220 K indicates that a frustrated magnetic glass develops in the ferromagnetic martensite. An AC magnetic anomaly which shows Vogel-Fulcher dynamics in the vicinity of ∼160 K is evidence of a further glassy freezing process. This coincides with an acoustic loss peak and slight elastic stiffening that is typical of the outcome of freezing of ferroelastic twin walls. The results suggest that local strain variations associated with the ferroelastic twin walls couple with local moments to induce glassy magnetic behaviour.
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Affiliation(s)
- Le Zhang
- Frontier Institute of Science and Technology and State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, 710049, People's Republic of China
- Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge, CB2 3EQ, United Kingdom
- School of Materials Science and Engineering, The University of New South Wales, Sydney, NSW 2052, Australia
| | - Xiaojie Lou
- Frontier Institute of Science and Technology and State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, 710049, People's Republic of China
| | - Chao Zhou
- School of Science, MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China
| | - Sen Yang
- School of Science, MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China
| | - Xiaobing Ren
- Frontier Institute of Science and Technology and State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, 710049, People's Republic of China
- Center for Functional Materials, National Institute for Materials Science, Tsukuba 305-0047, Ibaraki, Japan
| | - Danyang Wang
- School of Materials Science and Engineering, The University of New South Wales, Sydney, NSW 2052, Australia
| | - Michael A Carpenter
- Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge, CB2 3EQ, United Kingdom
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Wang X, Wu M, Yang T, Khenata R. Effect of Zn doping on phase transition and electronic structures of Heusler-type Pd 2Cr-based alloys: from normal to all-d-metal Heusler. RSC Adv 2020; 10:17829-17835. [PMID: 35515617 PMCID: PMC9053613 DOI: 10.1039/d0ra02951c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2020] [Accepted: 05/01/2020] [Indexed: 11/21/2022] Open
Abstract
Based on first-principles calculations, for Heusler alloys Pd2CrZ (Z = Al, Ga, In, Tl, Si, Sn, P, As, Sb, Bi, Se, Te, Zn), the effect of Zn doping on their phase transition and electronic structure has been studied in this work. These alloys can be divided into two classes: (i) all-d-metal Heusler Pd2CrZn and (ii) other normal Heusler alloys Pd2CrZ (Z = Al, Ga, In, Tl, Si, Sn, P, As, Sb, Bi, Se, Te). For all-d-metal Heusler alloy Pd2CrZn, transition metal element Zn behaves like a main group element due to its full 3d occupied state, and therefore the Zn atoms tend to occupy Wyckoff sites D (0.75, 0.75, 0.75) instead of replacing Pd atoms at A sites (0, 0, 0). The stable tetragonal L10 state is obtained via tetragonal deformation and the L10 stable state can be tuned by the uniform strain. The stability of the tetragonal state is analyzed and proved via calculation of the density of states (DOSs) and the phonon spectrum. For the series of normal Heusler alloys Pd2CrZ, doping with Zn atoms can induce or strengthen the martensitic transformation, or regulate the large c/a ratios to a more reasonable range. It is hoped that this work can provide some guidance for further studies of the relationship between all-d-metal and normal Heusler alloys in the future. By first-principles calculations, for Heusler alloys Pd2CrZ (Z = Al, Ga, In, Tl, Si, Sn, P, As, Sb, Bi, Se, Te, Zn), the effect of Zn doping on their phase transition and electronic structure has been studied in this work.![]()
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Affiliation(s)
- Xiaotian Wang
- School of Physical Science and Technology, Southwest University Chongqing 400715 China
| | - Mengxin Wu
- School of Physical Science and Technology, Southwest University Chongqing 400715 China
| | - Tie Yang
- School of Physical Science and Technology, Southwest University Chongqing 400715 China
| | - Rabah Khenata
- Laboratoire de Physique Quantique de la Matière et de la Modélisation Mathématique (LPQ3M), Université de Mascara Mascara 29000 Algeria
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Takhsha Ghahfarokhi M, Nasi L, Casoli F, Fabbrici S, Trevisi G, Cabassi R, Albertini F. Following the Martensitic Configuration Footprints in the Transition Route of Ni-Mn-Ga Magnetic Shape Memory Films: Insight into the Role of Twin Boundaries and Interfaces. MATERIALS 2020; 13:ma13092103. [PMID: 32370074 PMCID: PMC7254361 DOI: 10.3390/ma13092103] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/22/2020] [Revised: 04/26/2020] [Accepted: 04/28/2020] [Indexed: 11/25/2022]
Abstract
Magnetic shape memory Heuslers have a great potential for their exploitation in next-generation cooling devices and actuating systems, due to their “giant” caloric and thermo/magnetomechanical effects arising from the combination of magnetic order and a martensitic transition. Thermal hysteresis, broad transition range, and twinning stress are among the major obstacles preventing the full exploitation of these materials in applications. Using Ni-Mn-Ga seven-modulated epitaxial thin films as a model system, we investigated the possible links between the phase transition and the details of the twin variants configuration in the martensitic phase. We explored the crystallographic relations between the martensitic variants from the atomic-scale to the micro-scale through high-resolution techniques and combined this information with the direct observation of the evolution of martensitic twin variants vs. temperature. Based on our multiscale investigation, we propose a route for the martensitic phase transition, in which the interfaces between different colonies of twins play the major role of initiators for both the forward and reverse phase transition. Linking the martensitic transition to the martensitic configuration sheds light onto the possible mechanisms influencing the transition and paves the way towards microstructure engineering for the full exploitation of shape memory Heuslers in different applications.
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Mutai T, Sasaki T, Sakamoto S, Yoshikawa I, Houjou H, Takamizawa S. A superelastochromic crystal. Nat Commun 2020; 11:1824. [PMID: 32286312 PMCID: PMC7156499 DOI: 10.1038/s41467-020-15663-5] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2019] [Accepted: 03/23/2020] [Indexed: 11/10/2022] Open
Abstract
Chromism—color changes by external stimuli—has been intensively studied to develop smart materials because of easily detectability of the stimuli by eye or common spectroscopy as color changes. Luminescent chromism has particularly attracted research interest because of its high sensitivity. The color changes typically proceed in a one-way, two-state cycle, i.e. a stimulus-induced state will restore the initial state by another stimuli. Chromic systems showing instant, biphasic color switching and spontaneous reversibility will have wider practical applicability. Here we report luminescent chromism having such characteristics shown by mechanically controllable phase transitions in a luminescent organosuperelastic crystal. In mechanochromic luminescence, superelasticity—diffusion-less plastic deformation with spontaneous shape recoverability—enables real-time, reversible, and stepless control of the abundance ratio of biphasic color emissions via a single-crystal-to-single-crystal transformation by controlling a single stimulus, force stress. The unique chromic system, referred to as superelastochromism, holds potential for realizing informative molecule-based mechanical sensing. Color changes by external stimuli, so-called chromism, have been intensively studied to develop smart materials due to the stimulus-responsiveness of chromic materials. Here the authors demonstrate luminescent chromism during a mechanically controllable phase transition in a luminescent organosuperelastic crystal.
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Affiliation(s)
- Toshiki Mutai
- Department of Materials and Environmental Science, Institute of Industrial Science, University of Tokyo, 4-6-1 Komaba, Meguro-Ku, Tokyo, 153-8505, Japan.
| | - Toshiyuki Sasaki
- Department of Materials System Science, Graduate School of Nanobioscience, Yokohama City University, 22-2 Seto, Kanazawa-Ku, Yokohama, Kanagawa, 236-0027, Japan
| | - Shunichi Sakamoto
- Department of Materials System Science, Graduate School of Nanobioscience, Yokohama City University, 22-2 Seto, Kanazawa-Ku, Yokohama, Kanagawa, 236-0027, Japan
| | - Isao Yoshikawa
- Department of Materials and Environmental Science, Institute of Industrial Science, University of Tokyo, 4-6-1 Komaba, Meguro-Ku, Tokyo, 153-8505, Japan
| | - Hirohiko Houjou
- Department of Materials and Environmental Science, Institute of Industrial Science, University of Tokyo, 4-6-1 Komaba, Meguro-Ku, Tokyo, 153-8505, Japan
| | - Satoshi Takamizawa
- Department of Materials System Science, Graduate School of Nanobioscience, Yokohama City University, 22-2 Seto, Kanazawa-Ku, Yokohama, Kanagawa, 236-0027, Japan.
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Sarkar SK, Ahlawat S, Kaushik SD, Babu PD, Sen D, Honecker D, Biswas A. Magnetic ordering of the martensite phase in Ni-Co-Mn-Sn-based ferromagnetic shape memory alloys. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2020; 32:115801. [PMID: 31739303 DOI: 10.1088/1361-648x/ab5876] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The magnetic state of low temperature martensite phase in Co-substituted Ni-Mn-Sn-based ferromagnetic shape memory alloys (FSMAs) has been investigated, in view of numerous conflicting reports of occurrences of spin glass (SG), superparamagnetism (SPM) or long range anti-ferromagnetic (AF) ordering. Combination of DC magnetization, AC susceptibility and small angle neutron scattering (SANS) studies provide clear evidence for AF order in the martensitic phase of Ni45Co5Mn38Sn12 alloy and rule out SPM and SG orders. Identical studies on another alloy of close composition, Ni44Co6Mn40Sn10, point to the presence of SG order in the martensitic phase and the absence of SPM behavior, contrary to earlier reports. SANS results do show the presence of nanometre-sized clusters but they are found to grow in size from 3 nm at 30 K to 11 nm at 300 K, and do not correlate with magnetism in these alloys.
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Affiliation(s)
- Sudip Kumar Sarkar
- Glass and Advanced Materials Division, Bhabha Atomic Research Centre, Mumbai 400085, India
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Optimizing the Caloric Properties of Cu-Doped Ni-Mn-Ga Alloys. MATERIALS 2020; 13:ma13020419. [PMID: 31963220 PMCID: PMC7014183 DOI: 10.3390/ma13020419] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/12/2019] [Revised: 01/09/2020] [Accepted: 01/14/2020] [Indexed: 11/16/2022]
Abstract
With the purpose to optimize the functional properties of Heusler alloys for their use in solid-state refrigeration, the characteristics of the martensitic and magnetic transitions undergone by Ni50Mn25−xGa25Cux (x = 3–11) alloys have been studied. The results reveal that, for a Cu content of x = 5.5–7.5, a magnetostructural transition between paramagnetic austenite and ferromagnetic martensite takes place. In such a case, magnetic field and stress act in the same sense, lowering the critical combined fields to induce the transformation; moreover, magnetocaloric and elastocaloric effects are both direct, suggesting the use of combined fields to improve the overall refrigeration capacity of the alloy. Within this range of compositions, the measured transformation entropy is increased owing to the magnetic contribution to entropy, showing a maximum at composition x = 6, in which the magnetization jump at the transformation is the largest of the set. At the same time, the temperature hysteresis of the transformation displays a minimum at x = 6, attributed to the optimal lattice compatibility between austenite and martensite. We show that, among this system, the optimal caloric performance is found for the x = 6 composition, which displays high isothermal entropy changes (−36 J·kg−1·K−1 under 5 T and −8.5 J·kg−1·K−1 under 50 MPa), suitable working temperature (300 K), and low thermal hysteresis (3 K).
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Wei S, Huang Y, Fang J, Cai Q, Yang X. Strengthening the Shape Memory Behaviors of l-Lactide-ased Copolymers via Its Stereocomplexation Effect with Poly(d-Lactide). Ind Eng Chem Res 2019. [DOI: 10.1021/acs.iecr.9b04605] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Zeng Q, Shen J, Zhang H, Chen J, Ding B, Xi X, Liu E, Wang W, Wu G. Electronic behaviors during martensitic transformations in all-d-metal Heusler alloys. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2019; 31:425401. [PMID: 31226695 DOI: 10.1088/1361-648x/ab2bd8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
For solid-state phase transitions, the alterations of electronic structure driven by the band Jahn-Teller effect would play an essential role in the structural phase transitions and in switching the resistivity or magnetization states for potential applications. However, this evolution of the electronic structure and electronic transport during the martensitic transformations (MT) still lacks comprehensive investigations, especially in magnetic martensitic materials studied in recent years. In this work, we report a study on the electronic behaviors during the MT in a kind of all-d-metal Ni50-x Fe x Mn35Ti15 Heusler magnetic shape memory alloys, by combining x-ray diffraction, calorimetric, magnetic, transport measurements and calculations. Based on the magnetic MTs, the system shows large magnetocaloric effect and magnetoresistance. In the whole temperature range, the system is dominated by hole carriers in both parent and martensite phases. A sharp increase in carrier concentration is observed across the transformations. Meanwhile, the mobility of holes is depressed due to the lattice distortion. A picture of the characteristics of MTs has been proposed for general understanding and clues of the potential spintronic applications based on the magnetostructural phase transitions.
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Affiliation(s)
- Qingqi Zeng
- Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China. University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
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Zhang K, Tan C, Zhao W, Guo E, Tian X. Computation-Guided Design of Ni-Mn-Sn Ferromagnetic Shape Memory Alloy with Giant Magnetocaloric Effect and Excellent Mechanical Properties and High Working Temperature via Multielement Doping. ACS APPLIED MATERIALS & INTERFACES 2019; 11:34827-34840. [PMID: 31461258 DOI: 10.1021/acsami.9b08640] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Ni-Mn-Sn ferromagnetic shape memory alloys (FSMAs) have promise for application in efficient solid-state refrigeration. However, the simultaneous achievement of giant magnetocaloric effect (MCE) and excellent mechanical properties and high working temperature in these materials is always the challenge. Computation-guided materials design techniques provide an efficient way to design and identify new magnetocaloric materials. Herein, a new strategy of multidoping is presented. First, we conduct a detailed and comprehensive first-principles study and predict that Ni-Mn-Sn FSMAs with co-doping 6.25 atom % Cu and 6.25-12.5 atom % Co can realize the multiobjective optimization of magnetocaloric material. Then, it is confirmed by experiment and we report on Ni40Co8Mn37Sn9Cu6 FSMA exhibiting a large magnetic entropy change (34.8 J/(kg K)) of a large value in the prevalent MCE materials at high temperature (∼344 K) and whose compression stress and strain (∼1072.0 MPa and ∼11.9%) are both the largest among Ni-Mn-based MCE materials. Notably, the effect of Co and Cu doping is not simply stacked because they play opposite roles in Curie temperature (TC) and martensitic transformation temperature (TM). So, achieving the balance of their effect to combine their merits in a very narrow window is the key step. This approach of multielement doping holds promise to be extended to other magnetocaloric materials to enhance their multiple properties simultaneously.
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