采用溶胶-凝胶法,将存在La空位的La0.77Ca0.2MnO3母体材料进行Sr掺杂,制备了钙钛矿样品La0.71Ca0.2Sr0.06MnO3,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1T时,该样品磁熵变△|SM|达到2.32 J·kg-1 ·K-1,居里温度Tc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.
参考文献
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