Regulation of magnetocaloric properties and critical behavior of La0.7Sr0.3MnO3 by high-pressure heat treatment
Summary: La0.7Sr0.3MnO3 polycrystalline samples were prepared using a two-step process (high-temperature solid-phase reaction method and high-pressure heat treatment) under different pressures. The magnetocaloric properties of the samples exhibited a significant dependence on pressure. The nonlinear...
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Elsevier
2025-06-01
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| author | Xiang Jin Huaijin Ma Qi Li Jiawei Xu Jianjun Zhao Tegus O Jiaohong Huang |
| author_facet | Xiang Jin Huaijin Ma Qi Li Jiawei Xu Jianjun Zhao Tegus O Jiaohong Huang |
| author_sort | Xiang Jin |
| collection | DOAJ |
| description | Summary: La0.7Sr0.3MnO3 polycrystalline samples were prepared using a two-step process (high-temperature solid-phase reaction method and high-pressure heat treatment) under different pressures. The magnetocaloric properties of the samples exhibited a significant dependence on pressure. The nonlinear changes in average bond length with pressure were defined in two stages: 0–2 GPa (S1) and 2-4-6 GPa(S2). S1: The double-exchange interaction was weakened and the Curie temperature was decreased from 367 K to 338 K due to negative volume compressibility, while the peaks of magnetic entropy change were reduced. S2: The rate of linear increase in Curie temperature induced by normal cell contraction is 5.6 K·GPa−1. Maximum magnetic entropy change and refrigeration temperature span varied at the rates of 0.29 J·kg−1·K−1·GPa−1 and -5.37 K·GPa−1, respectively. All the samples exhibited a second-order ferromagnetic-paramagnetic transitions with critical behavior evolving from mean-field model adherence (S1) to deviation (S2). The magnetocaloric properties of La0.7Sr0.3MnO3 can be effectively regulated by pressure. |
| format | Article |
| id | doaj-art-449a0cf3abc64be686dbfdce596dfcdd |
| institution | OA Journals |
| issn | 2589-0042 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | Elsevier |
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| spelling | doaj-art-449a0cf3abc64be686dbfdce596dfcdd2025-08-20T02:23:11ZengElsevieriScience2589-00422025-06-0128611253310.1016/j.isci.2025.112533Regulation of magnetocaloric properties and critical behavior of La0.7Sr0.3MnO3 by high-pressure heat treatmentXiang Jin0Huaijin Ma1Qi Li2Jiawei Xu3Jianjun Zhao4Tegus O5Jiaohong Huang6School of Physics and Electronic Information, Inner Mongolia Normal University, Hohhot 010020, China; School of Vocational and Technical Teachers’ Education, Baotou Teachers’ College, Baotou 014030, China; Key Laboratory of Magnetism and Magnetic Materials for Higher Education in Inner Mongolia Autonomous Region, Baotou 014030, ChinaKey Laboratory of Magnetism and Magnetic Materials for Higher Education in Inner Mongolia Autonomous Region, Baotou 014030, China; School of Physical Science and Technology, Baotou Teachers’ College, Baotou 014030, ChinaKey Laboratory of Magnetism and Magnetic Materials for Higher Education in Inner Mongolia Autonomous Region, Baotou 014030, China; School of Physical Science and Technology, Baotou Teachers’ College, Baotou 014030, ChinaKey Laboratory of Magnetism and Magnetic Materials for Higher Education in Inner Mongolia Autonomous Region, Baotou 014030, China; School of Physical Science and Technology, Baotou Teachers’ College, Baotou 014030, ChinaKey Laboratory of Magnetism and Magnetic Materials for Higher Education in Inner Mongolia Autonomous Region, Baotou 014030, China; School of Physical Science and Technology, Baotou Teachers’ College, Baotou 014030, China; Corresponding authorSchool of Physics and Electronic Information, Inner Mongolia Normal University, Hohhot 010020, China; Corresponding authorNational Key Laboratory of Baiyunobo Rare Earth Resource Research and Comprehensive Utilization, Baotou Research Institute of Rare Earths, Baotou 014030, China; Corresponding authorSummary: La0.7Sr0.3MnO3 polycrystalline samples were prepared using a two-step process (high-temperature solid-phase reaction method and high-pressure heat treatment) under different pressures. The magnetocaloric properties of the samples exhibited a significant dependence on pressure. The nonlinear changes in average bond length with pressure were defined in two stages: 0–2 GPa (S1) and 2-4-6 GPa(S2). S1: The double-exchange interaction was weakened and the Curie temperature was decreased from 367 K to 338 K due to negative volume compressibility, while the peaks of magnetic entropy change were reduced. S2: The rate of linear increase in Curie temperature induced by normal cell contraction is 5.6 K·GPa−1. Maximum magnetic entropy change and refrigeration temperature span varied at the rates of 0.29 J·kg−1·K−1·GPa−1 and -5.37 K·GPa−1, respectively. All the samples exhibited a second-order ferromagnetic-paramagnetic transitions with critical behavior evolving from mean-field model adherence (S1) to deviation (S2). The magnetocaloric properties of La0.7Sr0.3MnO3 can be effectively regulated by pressure.http://www.sciencedirect.com/science/article/pii/S2589004225007941Materials scienceMaterials synthesisMaterials property |
| spellingShingle | Xiang Jin Huaijin Ma Qi Li Jiawei Xu Jianjun Zhao Tegus O Jiaohong Huang Regulation of magnetocaloric properties and critical behavior of La0.7Sr0.3MnO3 by high-pressure heat treatment iScience Materials science Materials synthesis Materials property |
| title | Regulation of magnetocaloric properties and critical behavior of La0.7Sr0.3MnO3 by high-pressure heat treatment |
| title_full | Regulation of magnetocaloric properties and critical behavior of La0.7Sr0.3MnO3 by high-pressure heat treatment |
| title_fullStr | Regulation of magnetocaloric properties and critical behavior of La0.7Sr0.3MnO3 by high-pressure heat treatment |
| title_full_unstemmed | Regulation of magnetocaloric properties and critical behavior of La0.7Sr0.3MnO3 by high-pressure heat treatment |
| title_short | Regulation of magnetocaloric properties and critical behavior of La0.7Sr0.3MnO3 by high-pressure heat treatment |
| title_sort | regulation of magnetocaloric properties and critical behavior of la0 7sr0 3mno3 by high pressure heat treatment |
| topic | Materials science Materials synthesis Materials property |
| url | http://www.sciencedirect.com/science/article/pii/S2589004225007941 |
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