通过X射线衍射及磁测量实验研究了Pr2AlFe16-xMnx化合物的结构与磁性,结果表明Pr2AlFe16-xMnx化合物具有Th2Zn17型结构;随着锰替代量的增加,化合物的单胞体积呈现先小后大的非线性增加,分析表明该类化合物在其磁相变点附近存在较大的正的本征磁致伸缩现象.进一步对Pr2A-1Fe13Mn3化合物进行的变温X射线衍射研究表明,该化合物在其居里点附近(180～198K)存在负热膨胀现象,其热膨胀系数为-3.6×10-4/K.磁性测量表明随着锰含量的增加Pr2A-lFe16-xMNX化合物的居里温度及自发磁化强度都急剧下降,对这些现象进行了解释.
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