以LaFe11.6Si1.4合金为研究对象,系统分析了该一级相变材料的居里温度(Tc)、磁场诱导磁相变的临界磁场(Hc)、磁化率(x)、磁滞、磁熵变(△S)、制冷能力(RCP)等磁性特性.结果表明:温度诱导磁相变的居里温度和磁场诱导磁相变的临界磁场均随磁场呈线性增加,ATC和△H随磁场和温度的变化率的值分别为4.1 K·T-1和0.2 T·K-1.当合金处于纯铁磁态和顺磁态时熵变磁熵变几乎为零,但磁场诱导的磁相变,会导致某一定温度下合金磁熵变有一个突变.但合金最大熵变并不是随磁场的增加而线性增加,当磁场达到一定值后随磁场增加其值基本没有变化.不同模型计算的制冷能力均随磁场的增加而呈线性增加.在两相共存态中,同一温度下两种不同铁磁的磁化率存在差异,即因磁场诱导的铁磁态相与合金中本身的铁磁态相的磁化率存在差异,且前者小于后者,这种物理现象对深入研究温度诱导和磁场诱导磁相变的差异有一定的参考价值.
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