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Munazat DR, Kurniawan B, Kurita N, Wang X, Manawan MTE, Sudiro T, Nojiri H. Investigation of the impact of A-site cation disorder on the structure, magnetic properties, and magnetic entropy change of trisubstituted divalent ions in La 0.7(Ba,Ca,Sr) 0.3MnO 3 manganite. Phys Chem Chem Phys 2024; 26:18343-18367. [PMID: 38912550 DOI: 10.1039/d4cp01039f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/25/2024]
Abstract
This study investigates the effect of A-site disorder, characterized by the average ionic radius (〈rA〉) and the cation mismatch (σ2), on the structural, magnetic, critical behavior, and magnetic entropy changes in La0.7(Ba,Ca,Sr)0.3MnO3 manganites with trisubstituted Ba, Ca, and Sr. The sol-gel method was used to prepare polycrystalline samples. All series of compounds crystallize in rhombohedral symmetry with the R3̄c space group. A linear relationship between lattice parameters, unit cell volume, and 〈rA〉 was observed. This reveals an unusual behavior in the correlation between 〈rA〉 and σ2 concerning magnetic properties, which is attributed to the complex simultaneous trisubstitution of divalent ions. Energy dispersive spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS) were utilized to validate the chemical composition of compounds. All the samples crystallized in rhombohedral symmetry, and the lattice parameters increased continuously with increasing 〈rA〉. A-site disorder causes distortions in the Mn-O bond length and Mn-O-Mn bond angle in the MnO6 octahedral structure, which influences the double-exchange interaction and electronic bandwidth (W). The Curie temperature (TC) increases linearly with increasing W. The critical behavior around TC for all the samples was investigated by determining the values of the critical exponents (β, γ, and δ) using the modified Arrott plot (MAP) method. The estimated critical exponents show that the unconventional model establishes a short-range ferromagnetic order. The maximum magnetic entropy change (-ΔSM) was obtained with the lowest 〈rA〉 and σ2 value. The analysis of the critical behavior and universal curve indicates a second-order phase transition (SOPT) nature for all samples.
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Affiliation(s)
| | - Budhy Kurniawan
- Department of Physics, Universitas Indonesia, Depok 16424, Indonesia.
| | - Nobuyuki Kurita
- Department of Physics, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8551, Japan
| | - Xiaodong Wang
- Central Analytical Research Facility, Queensland University of Technology, Brisbane, Australia
| | - Maykel T E Manawan
- Research Center for Advanced Material, National Research and Innovation Agency (BRIN), South Tangerang 15314, Banten, Indonesia
- Fakultas Teknologi Pertahanan, Universitas Pertahanan Indonesia, Bogor 16810, Indonesia
| | - Toto Sudiro
- Research Center for Advanced Material, National Research and Innovation Agency (BRIN), South Tangerang 15314, Banten, Indonesia
| | - Hiroyuki Nojiri
- Institute for Materials Research, Tohoku University, Kathira 2-1-1, Sendai 980-8577, Japan
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Chatterjee S, Das K, Das I. Magnetic and magnetocaloric effect study of a polycrystalline Gd 0.5Sr 0.5-xCa xMnO 3 compound. Phys Chem Chem Phys 2022; 24:8233-8244. [PMID: 35319050 DOI: 10.1039/d2cp00114d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The magnetic and magnetocaloric properties of polycrystalline Gd0.5Sr0.5-xCaxMnO3 (x = 0.0, 0.2, 0.3, 0.4 and 0.5) compounds have been investigated. Depending upon the Ca and Sr proportions, fascinating magnetic ground states were observed in the Gd0.5Sr0.5-xCaxMnO3 compounds. Here, the dominating nature of the canted magnetic state (for the Gd0.5Ca0.5MnO3 compound) and glassy (disordered ferromagnetic) magnetic state (for the Gd0.5Sr0.5MnO3 compound) are observed. However, for the intermediate doped samples (x = 0.2, 0.3, 0.4), a competing nature is found in their magnetic and exchange bias properties. Additionally, in the low temperature region, a significantly large magnetocaloric effect is observed for all the samples. At a 70 kOe external magnetic field, the highest observed value of the magnetocaloric entropy change is 21.58 J kg-1 K-1 (for the Gd0.5Ca0.5MnO3 sample) and the lowest is 10.15 J kg-1 K-1 (for the Gd0.5Sr0.5MnO3 sample).
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Affiliation(s)
- Soma Chatterjee
- CMP Division, Saha Institute of Nuclear Physics, HBNI, AF-Bidhannagar, Kolakta, 700064, India
| | - Kalipada Das
- Department of Physics, Seth Anandram Jaipuria College, 10-Raja Nabakrishna Street, Kolkata, 700005, India.
| | - I Das
- CMP Division, Saha Institute of Nuclear Physics, HBNI, AF-Bidhannagar, Kolakta, 700064, India
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Alleg S, Chabi T, Bensebaa N, Saurina J, Escoda L, Hlil EK, Suñol JJ. Investigation of the Critical Behavior, Magnetocaloric Effect and Hyperfine Structure in the Fe 72Nb 8B 20 Powders. MATERIALS (BASEL, SWITZERLAND) 2020; 13:E4476. [PMID: 33050307 PMCID: PMC7601455 DOI: 10.3390/ma13204476] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/15/2020] [Revised: 09/30/2020] [Accepted: 10/04/2020] [Indexed: 11/29/2022]
Abstract
Microstructure as well as magnetic, thermal and magnetocaloric properties of the mechanically alloyed Fe72Nb8B20 powders have been investigated by means of Mössbauer spectrometry, differential scanning calorimetry (DSC), and magnetic measurements. The Mössbauer spectrometry results showed the formation of nanostructured Fe(B) and Fe(Nb) solid solutions, Fe2B boride, and an amorphous phase. The endothermic and exothermic peaks that are observed in the DSC curves might be related to the Curie temperature, and the crystallization of the amorphous phase, respectively. The critical exponent values around the magnetic phase transition of the amorphous phase (TC = 480 K), are deduced from the modified Arrott plots, Kouvel-Fisher curves and critical isotherm examination. The calculated values (β = 0.457 ± 0.012, γ = 0.863 ± 0.136 and δ = 3.090 ± 0.004) are near to those of the mean field model, revealing a dominating role of magnetic order arising due to long-range ferromagnetic interactions, as the critical exponents are mean-field-like. The maximum entropy change and the refrigerant capacity values are 1.45 J/kg·K and 239 J/kg, respectively, under a magnetic field of 5 T.
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Affiliation(s)
- Safia Alleg
- Laboratoire de Magnétisme et Spectroscopie des solides (LM2S), Département de Physique, Université Badji Mokhtar Annaba, BP12, 23000 Annaba, Algeria; (S.A.); (T.C.); (N.B.)
| | - Thaounza Chabi
- Laboratoire de Magnétisme et Spectroscopie des solides (LM2S), Département de Physique, Université Badji Mokhtar Annaba, BP12, 23000 Annaba, Algeria; (S.A.); (T.C.); (N.B.)
- Department Física, Universitat de Girona, Campus Montilivi s/n, 17003 Girona, Spain; (J.S.); (L.E.)
| | - Nadia Bensebaa
- Laboratoire de Magnétisme et Spectroscopie des solides (LM2S), Département de Physique, Université Badji Mokhtar Annaba, BP12, 23000 Annaba, Algeria; (S.A.); (T.C.); (N.B.)
| | - Joan Saurina
- Department Física, Universitat de Girona, Campus Montilivi s/n, 17003 Girona, Spain; (J.S.); (L.E.)
| | - Lluisa Escoda
- Department Física, Universitat de Girona, Campus Montilivi s/n, 17003 Girona, Spain; (J.S.); (L.E.)
| | - El-Kebir Hlil
- Institut Néel, Grenoble INP, Université Grenoble Alpes, CNRS, 38000 Grenoble, France;
| | - Joan-Josep Suñol
- Department Física, Universitat de Girona, Campus Montilivi s/n, 17003 Girona, Spain; (J.S.); (L.E.)
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Comparison of experimental and first-principle results of band-gap narrowing of MgO nanostructures and their dependence on crystal structural parameters. APPLIED NANOSCIENCE 2018. [DOI: 10.1007/s13204-018-0859-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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