OALib Journal期刊
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la{0.67-x}ca{0.33}mno{3}系列样品的磁热效应
Keywords: 无机非金属材料,锰钙钛矿,磁致冷,磁热效应
Abstract:
?用溶胶--凝胶法制备了不同空位浓度掺杂的la$_{0.67-x}$ca$_{0.33}$mno$_{3}$系列样品($x$=0.00,0.02,0.06,0.10),用扫描电子显微镜(sem)观察了样品的形态和颗粒大小,x射线衍射实验结果显示样品为单相钙钛矿结构,用振动样品磁强计(vsm)测量了样品的磁化强度随温度变化的$m$--$t$曲线和起始磁化$m$--$h$曲线.研究了空位浓度对样品的居里温度$t_{\rmc}$和磁熵变的影响.结果表明,空位浓度的掺杂将样品的居里温度$t_{\rmc}$提高至室温附近,磁熵变得到增强.对于经历了一级相变的样品la$_{0.67-x}$ca$_{0.33}$mno$_{3}$($x$=0.02),在居里温度$t_{\rmc}$(277k)附近和1t外磁场下,最大磁熵变达到了2.78j/(kg$\cdot$k).
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