中国物理B ›› 2013, Vol. 22 ›› Issue (5): 57501-057501.doi: 10.1088/1674-1056/22/5/057501

所属专题: TOPICAL REVIEW — Magnetism, magnetic materials, and interdisciplinary research

• SPECIAL TOPIC --- Non-equilibrium phenomena in soft matters • 上一篇    下一篇

Review of magnetocaloric effect in perovskite-type oxides

钟伟a, 区泽棠b, 都有为a   

  1. a National Laboratory of Solid State Microstructures and School of Physics, Nanjing University, Nanjing 210093, China;
    b Chemistry Department, Hong Kong Baptist University, Hong Kong, China
  • 收稿日期:2013-02-22 出版日期:2013-04-01 发布日期:2013-04-01
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 11174132), the National Basic Research Program of China (Grant Nos. 2011CB922102 and 2012CB932304), and the Priority Academic Program Development of Jiangsu Higher Education Institutions, China.

Review of magnetocaloric effect in perovskite-type oxides

Zhong Wei (钟伟)a, Au Chak-Tong (区泽棠)b, Du You-Wei (都有为)a   

  1. a National Laboratory of Solid State Microstructures and School of Physics, Nanjing University, Nanjing 210093, China;
    b Chemistry Department, Hong Kong Baptist University, Hong Kong, China
  • Received:2013-02-22 Online:2013-04-01 Published:2013-04-01
  • Contact: Zhong Wei E-mail:wzhong@nju.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 11174132), the National Basic Research Program of China (Grant Nos. 2011CB922102 and 2012CB932304), and the Priority Academic Program Development of Jiangsu Higher Education Institutions, China.

摘要: We survey the magnetocaloric effect in perovskite-type oxides (including doped ABO3-type manganese oxides, A3B2O7-type two-layered perovskite oxides, and A2B'B''O6-type ordered double-perovskite oxides). Magnetic entropy changes larger than those of gadolinium can be observed in polycrystalline La1-xCaxMnO3 and alkali-metal (Na or K) doped La0.8Ca0.2MnO3 perovskite-type manganese oxides. The large magnetic entropy change produced by an abrupt reduction of magnetization is attributed to the anomalous thermal expansion at the Curie temperature. Considerable magnetic entropy changes can also be observed in two-layered perovskites La1.6Ca1.4Mn2O7 and La2.5-xK0.5+xMn2O7+δ (0 < x < 0.5), and double-perovskite Ba2Fe1+xMo1-xO6 (0 ≤ x ≤ 0.3) near their respective Curie temperatures. Compared with rare earth metals and their alloys, the perovskite-type oxides are lower in cost, and they exhibit higher chemical stability and higher electrical resistivity, which together favor lower eddy-current heating. They are potential magnetic refrigerants at high temperatures, especially near room temperature.

关键词: perovskite-type oxides, magnetocaloric effect, magnetic entropy change, magnetic phase transition

Abstract: We survey the magnetocaloric effect in perovskite-type oxides (including doped ABO3-type manganese oxides, A3B2O7-type two-layered perovskite oxides, and A2B'B''O6-type ordered double-perovskite oxides). Magnetic entropy changes larger than those of gadolinium can be observed in polycrystalline La1-xCaxMnO3 and alkali-metal (Na or K) doped La0.8Ca0.2MnO3 perovskite-type manganese oxides. The large magnetic entropy change produced by an abrupt reduction of magnetization is attributed to the anomalous thermal expansion at the Curie temperature. Considerable magnetic entropy changes can also be observed in two-layered perovskites La1.6Ca1.4Mn2O7 and La2.5-xK0.5+xMn2O7+δ (0 < x < 0.5), and double-perovskite Ba2Fe1+xMo1-xO6 (0 ≤ x ≤ 0.3) near their respective Curie temperatures. Compared with rare earth metals and their alloys, the perovskite-type oxides are lower in cost, and they exhibit higher chemical stability and higher electrical resistivity, which together favor lower eddy-current heating. They are potential magnetic refrigerants at high temperatures, especially near room temperature.

Key words: perovskite-type oxides, magnetocaloric effect, magnetic entropy change, magnetic phase transition

中图分类号:  (Magnetocaloric effect, magnetic cooling)

  • 75.30.Sg
75.50.Bb (Fe and its alloys)