样品La0.71Ca0.2Sr0.06MnO3的磁制冷性能

样品La_0.71Ca_0.2Sr_0.06MnO₃的磁制冷性能

基金项目:

河北省自然科学基金资助项目（E2008000194）

详细信息

1. Second Artillery Engineering University, Xi'an 710025, China;
2. Electrical and Mechanical Engineering, Hebei Chemical Pharmaceutical Vocational and Technical College, Shijiazhuang 050026, China

摘要: 采用溶胶-凝胶法,将存在La空位的La_0.77Ca_0.2MnO₃母体材料进行Sr掺杂,制备了钙钛矿样品La_0.71Ca_0.2Sr_0.06MnO₃,从相结构,磁化曲线等方面分析研究其具有大磁熵变的原因。在外加磁场1 T时,该样品磁熵变Δ|S_M|达到2.32 J·k^g-1·K^-1,居里温度T_C为270.6 K。该样品低磁场下在室温附近有较强的制冷力,可作为良好的室温磁制冷材料。
- 磁卡效应 /
- 磁熵变 /
- 居里温度 /
- 磁制冷
Abstract: Using the vacancy-La La_0.77Ca_0.2MnO₃ as matrix materials, Polycrystalline perovskites La_0.71Ca_0.2Sr_0.06MnO₃ have been prepared by the sol-gel method. The reason of large magnetic entropy change was analyzed by phase structures and magnetization curves. The maximum magnetic entropy change of 2.32 J·kg^-1·K^-1 is obtained near its Curie temperature (270.6 K) under the field of 1 T for La_0.71Ca_0.2Sr_0.06MnO₃ sample. The Sample possess stronger cooling ability near room temperature under low magnetic field, and can be used as a good room temperature magnetic refrigeration materials.
- magnetocaloric effect /
- magnetic entropy change /
- Curie temperature /
- magnetic refrigerantion