用溶胶-凝胶法制备了空位掺杂的La0.64Ca0.28Sr0.02MnO3材料样品,从结构,磁化曲线,磁相变等方面研究分析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3.01 J/(kg·K),居里温度TC为264 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.
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