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Nadig PR, M S M, Daivajna MD. Influence of heat sintering on the physical properties of bulk La 0.67Ca 0.33MnO 3 perovskite manganite: role of oxygen in tuning the magnetocaloric response. Phys Chem Chem Phys 2024; 26:5237-5252. [PMID: 38261427 DOI: 10.1039/d3cp04185a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2024]
Abstract
The effect of heat treatments on bulk poly-crystalline La0.67Ca0.33MnO3 perovskite manganite is presented, to explore the possible enhancement in magnetocaloric performance. Samples were prepared via conventional solid-state reaction route with annealing and sintering at various temperatures. Detailed measurements of temperature-dependent and field-dependent magnetization were carried out to estimate the Curie point and order of magnetic transition. The increased sintering temperature results in a steep transition near the TC, and establishes the magnetic sensitivity as well as the active zone for substantial magnetocaloric performance, at about 168.2% for the LCM9 (sintered at 900 °C) sample. The cause for the significant improvement in the magnetic and magnetocaloric response is brought to light using detailed X-ray photoelectron spectroscopy (XPS) analysis, highlighting the role of oxygen in modifying the Mn3+/Mn4+ charge ratio. The maximum value of the isothermal magnetic entropy change for the optimized sample is found to be 6.4 J kg-1 K-1, achieved at 269 K, while temperature-averaged entropy change (TEC) values, TEC(ΔTH-C = 3 K) and TEC(ΔTH-C = 5 K), of 6 J kg-1 K-1 and 5.2 J kg-1 K-1, respectively, were obtained with a low magnetic field change of 20 kOe. The obtained isothermal entropy change at low field for the optimized La0.67Ca0.33MnO3 sample is higher than that of pure Gd and most oxide-based materials. The relative cooling power (RCP) value is around 93 J kg-1 (ΔH = 20 kOe). The order of the phase transition is examined with universal scaling; the scaled entropy change curves confirm the collapse onto a single curve for LCM9, asserting second-order character, whereas the breakdown of the curve with a dispersion relation (d) of 101.1% at Θ = -5 confirms the onset of intrinsic first-order nature in the case of the high-temperature-sintered samples. Calorimetry measurements show thermal hysteresis of 2.4 K and 7.1 K for LCM11 (sintered at 1100 °C) at ramp rates of 5 K min-1 and 10 K min-1, respectively, confirming the first-order nature of the magnetic transition.
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Affiliation(s)
- Pramod R Nadig
- Department of Physics, Manipal Institute of Technology (MIT), Manipal Academy of Higher Education, Manipal, Karnataka, 576104, India.
| | - Murari M S
- DST PURSE Program, Mangalore University, Mangalagangotri, Mangalore, Karnataka, 574199, India
| | - Mamatha D Daivajna
- Department of Physics, Manipal Institute of Technology (MIT), Manipal Academy of Higher Education, Manipal, Karnataka, 576104, India.
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Hammedi K, Dkhili M, Khalifa M, Alvarez‐Galvan C, Ouertani R, Aouida S, Ezzaouia H. Effect of Annealing Temperature on Structural and Optical Properties of ZnTiO
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Perovskite Layers Deposited on Silicon for Photocatalytic Applications. ChemistrySelect 2021. [DOI: 10.1002/slct.202100215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Khadija Hammedi
- Groupe de recherche des semi-conducteurs,des Nanostructures et des Technologies Avancées (SNTA),Laboratoire de photovoltaïque (LPV) Centre de Recherches et des Technologies de l'Energie (CRTEn) Borj-Cedria B.P N° 952050- Hammam Lif. Tunisia
- Faculty of Mathematical Physical and Natural Sciences of Tunis ElManar University of Tunis El Manar Tunisia
| | - Marwa Dkhili
- Groupe de recherche des semi-conducteurs,des Nanostructures et des Technologies Avancées (SNTA),Laboratoire de photovoltaïque (LPV) Centre de Recherches et des Technologies de l'Energie (CRTEn) Borj-Cedria B.P N° 952050- Hammam Lif. Tunisia
- Faculty of Mathematical Physical and Natural Sciences of Tunis ElManar University of Tunis El Manar Tunisia
| | - Marouan Khalifa
- Groupe de recherche des semi-conducteurs,des Nanostructures et des Technologies Avancées (SNTA),Laboratoire de photovoltaïque (LPV) Centre de Recherches et des Technologies de l'Energie (CRTEn) Borj-Cedria B.P N° 952050- Hammam Lif. Tunisia
| | - Consuelo Alvarez‐Galvan
- Institute of Catalysis and Petrochemical, CSIC Marie Curie, 2, Cantoblanco 28049 Madrid Spain
| | - Rachid Ouertani
- Groupe de recherche des semi-conducteurs,des Nanostructures et des Technologies Avancées (SNTA),Laboratoire de photovoltaïque (LPV) Centre de Recherches et des Technologies de l'Energie (CRTEn) Borj-Cedria B.P N° 952050- Hammam Lif. Tunisia
| | - Selma Aouida
- Groupe de recherche des semi-conducteurs,des Nanostructures et des Technologies Avancées (SNTA),Laboratoire de photovoltaïque (LPV) Centre de Recherches et des Technologies de l'Energie (CRTEn) Borj-Cedria B.P N° 952050- Hammam Lif. Tunisia
| | - Hatem Ezzaouia
- Groupe de recherche des semi-conducteurs,des Nanostructures et des Technologies Avancées (SNTA),Laboratoire de photovoltaïque (LPV) Centre de Recherches et des Technologies de l'Energie (CRTEn) Borj-Cedria B.P N° 952050- Hammam Lif. Tunisia
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Henchiri C, Mnasri T, Benali A, Hamdi R, Dhahri E, Valente MA, Costa BFO. Structural study and large magnetocaloric entropy change at room temperature of La 1-x □ x MnO 3 compounds. RSC Adv 2020; 10:8352-8363. [PMID: 35497833 PMCID: PMC9050008 DOI: 10.1039/c9ra10469k] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2019] [Accepted: 02/10/2020] [Indexed: 11/21/2022] Open
Abstract
In this study, our central focus is to investigate the magnetocaloric characteristics of a La1-x □ x MnO3 (x = 0.1, 0.2 and 0.3) series prepared by a sol-gel technique published in Prog. Mater. Sci., 93, 2018, 112-232. The crystallographic study revealed that our compounds crystallize in a rhombohedral structure with R3̄c. Ferromagnetic (FM) and paramagnetic (PM) characters were detected from the variation in magnetization as a function of magnetic fields at different temperatures. The second order transition was verified from the Arrott plots (M 2 vs. (μ 0 H/M)), where the slopes have a positive value. In order to verify the second order, we traced the variation of magnetization vs. temperature at different magnetic fields for x = 0.2. This revealed a ferromagnetic (FM)-paramagnetic (PM) transition when temperature increases. Relying on the indirect method while using the Maxwell formula, we determined the variation in the entropy (-ΔS M) as a function of temperature for different magnetic fields for the three samples. We note that all the studied systems stand as good candidates for magnetic refrigeration with relative cooling power (RCP) values of around 131.4, 83.38 and 57.26 J kg-1 with magnetic fields below 2 T, respectively. Subsequently, the magnetocaloric effect was investigated by a phenomenological model for x = 0.2. The extracted data confirm that this phenomenological model is appropriate for the prediction of magnetocaloric properties. The study also demonstrated that this La0.8□0.2MnO3 system exhibits a universal behaviour.
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Affiliation(s)
- C Henchiri
- Laboratoire de Physique Appliquée, Faculté des Sciences de Sfax, Université de Sfax B. P. 802 Sfax 3018 Tunisia
| | - T Mnasri
- Research Unit UPIM, Faculty of Science, University of Gafsa 2112 Tunisia
| | - A Benali
- Laboratoire de Physique Appliquée, Faculté des Sciences de Sfax, Université de Sfax B. P. 802 Sfax 3018 Tunisia.,I3N, Physics Department, University of Aveiro 3810-193 Aveiro Portugal
| | - R Hamdi
- Laboratoire de Physique Appliquée, Faculté des Sciences de Sfax, Université de Sfax B. P. 802 Sfax 3018 Tunisia.,College of Health and Life Sciences, Hamad Bin Khalifa University Doha Qatar
| | - E Dhahri
- Laboratoire de Physique Appliquée, Faculté des Sciences de Sfax, Université de Sfax B. P. 802 Sfax 3018 Tunisia
| | - M A Valente
- I3N, Physics Department, University of Aveiro 3810-193 Aveiro Portugal
| | - B F O Costa
- CFisUC, Physics Department, University of Coimbra RuaLarga 3004-516 Coimbra Portugal
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Borchani SM, Koubaa WCR, Megdiche M. Structural, magnetic and electrical properties of a new double-perovskite LaNaMnMoO 6 material. ROYAL SOCIETY OPEN SCIENCE 2017; 4:170920. [PMID: 29291087 PMCID: PMC5717661 DOI: 10.1098/rsos.170920] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/17/2017] [Accepted: 10/04/2017] [Indexed: 06/07/2023]
Abstract
Structural, magnetic, magnetocaloric, electrical and magnetoresistance properties of an LaNaMnMoO6 powder sample have been investigated by X-ray diffraction (XRD), magnetic and electrical measurements. Our sample has been synthesized using the ceramic method. Rietveld refinements of the XRD patterns show that our sample is single phase and it crystallizes in the orthorhombic structure with Pnma space group. Magnetization versus temperature in a magnetic applied field of 0.05 T shows that our sample exhibits a paramagnetic-ferromagnetic transition with decreasing temperature. The Curie temperature TC is found to be 320 K. Arrott plots show that all our double-perovskite oxides exhibit a second-order magnetic phase transition. From the measured magnetization data of an LaNaMnMoO6 sample as a function of the magnetic applied field, the associated magnetic entropy change |-ΔSM| and the relative cooling power (RCP) have been determined. In the vicinity of TC, |-ΔSM| reached, in a magnetic applied field of 8 T, a maximum value of ∼4 J kg-1 K-1. Our sample undergoes a large magnetocaloric effect at near-room temperature. Resistivity measurements reveal the presence of an insulating-metal transition at Tρ = 180 K. A magnetoresistance of 30% has been observed at room temperature for 6 T, significantly larger than that reported for the A2FeMoO6 (A = Sr, Ba) double-perovskite system.
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Affiliation(s)
- Sameh Megdiche Borchani
- Institut Supérieur d'Informatique et de Multimédia de Sfax, Pôle technologique de Sfax, BP 242, Sakiet Ezzit, 3021 Sfax, Tunisia
- Laboratoire de Caractérisation Spectroscopique et Optique des Matériaux, Sfax University, BP 1171, 3000 Sfax, Tunisia
| | - Wissem Cheikh-Rouhou Koubaa
- Laboratoire de Physique des Matériaux, Faculté des Sciences de Sfax, Sfax University, BP 1171, 3000 Sfax, Tunisia
- Centre de Recherche en Informatique Multimédia et Traitement Numérique des Données, Technopôle de Sfax, BP 275, Sakiet Ezzit, 3021 Sfax, Tunisia
| | - Makrem Megdiche
- Laboratoire de Caractérisation Spectroscopique et Optique des Matériaux, Sfax University, BP 1171, 3000 Sfax, Tunisia
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Influence of crystallite size reduction on the magnetic and magnetocaloric properties of La0.6Sr0.35Ca0.05CoO3 nanoparticles. Polyhedron 2017. [DOI: 10.1016/j.poly.2016.09.044] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Khlifi M, Bejar M, Dhahri E, Lachkar P, Hlil EK. Influence of Ca-deficiency on the magneto-transport properties in La(0.8)Ca(0.2)MnO(3) perovskite and estimation of magnetic entropy change. JOURNAL OF APPLIED PHYSICS 2012; 111:103909-1039096. [PMID: 22711917 PMCID: PMC3371065 DOI: 10.1063/1.4718450] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2012] [Accepted: 04/16/2012] [Indexed: 06/01/2023]
Abstract
La(0.8)Ca(0.2 - x)□(x)MnO(3) (x = 0.00, 0.10, and 0.20) perovskite was prepared by the conventional solid-state reaction and annealed at 1473 K. X-ray diffraction and scanning electron microscopy shown the existence of a secondary phase attributed to the unreacted Mn(3)O(4) oxide. The magneto transport properties have been investigated based on the temperature dependence of the resistivity ρ(T) measurements under several applied magnetic fields. We note that the La(0.8)Ca(0.2)MnO(3) (x = 0.00) sample has a classical metal-insulator transition at T(ρ). But we have observed that the lacunars samples (x = 0.10 and 0.20) include a metallic and insulator behavior simultaneously below T(ρ) and the resistivity is dominated by tunneling through the barriers associated with the insulating phase. In other words, the calcium deficiency favors the enhancement of the insulator behavior. The electrical resistivity is fitted with the phenomenological percolation model, which is based on the phase segregation of ferromagnetic metallic clusters and paramagnetic insulating regions. Furthermore, we found that the estimated results are in good agreement with experimental data. Above all, the resistivity dependence on the temperature and magnetic field data is used to deduce the magnetic entropy change. We have found that these magnetic entropy change values are similar to those calculated in our previous work from the magnetic measurements. Finally, we have found an excellent estimation of the magnetic entropy change based on the Landau theory.
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Zhang Q, Thota S, Guillou F, Padhan P, Hardy V, Wahl A, Prellier W. Magnetocaloric effect and improved relative cooling power in (La(0.7)Sr(0.3)MnO(3)/SrRuO(3)) superlattices. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2011; 23:052201. [PMID: 21406900 DOI: 10.1088/0953-8984/23/5/052201] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Magnetic properties of a series of (La(0.7)Sr(0.3)MnO(3)/SrRuO(3)) superlattices, where the SrRuO(3) layer thickness is varying, are examined. A room-temperature magnetocaloric effect is obtained owing to the finite size effect which reduces the T(C) of La(0.7)Sr(0.3)MnO(3) layers. While the working temperature ranges are enlarged, - ΔS(M)(max) values remain similar to the values in polycrystalline La(0.7)Sr(0.3)MnO(3). Consequently, the relative cooling powers are significantly improved, the microscopic mechanism of which is related to the effect of the interfaces at La(0.7)Sr(0.3)MnO(3)/SrRuO(3) and higher nanostructural disorder. This study indicates that artificial oxide superlattices/multilayers might provide an alternative pathway in searching for efficient room-temperature magnetic refrigerator for (nano) micro-scale systems.
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Affiliation(s)
- Q Zhang
- Laboratoire CRISMAT, UMR 6508, CNRS ENSICAEN, F-14052 Caen Cedex 4, France.
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El-Hagary M, Shoker Y, Emam-Ismail M, Moustafa A, Abd El-Aal A, Ramadan A. Magnetocaloric effect in manganite perovskites La0.77Sr0.23Mn1−xCuxO3(0.1≤x≤0.3). SOLID STATE COMMUNICATIONS 2009; 149:184-187. [DOI: 10.1016/j.ssc.2008.11.023] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
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