研究了Nd2Co17-xMnx(x=0,1,3,5,7,9,11)化合物的结构和磁性.Nd2Co17-xMnx化合物具有菱方相Th2Zn17型结构;在x比较小时,随着x的增加,化合物的单胞体积缓慢增大,而在x比较大时,随着x的增加,化合物的单胞体积迅速增大,这表明Nd2Co17-xMnx化合物在磁性状态下存在着正的自发体磁致伸缩;随着x的增加,化合物的居里点及4.2 K下的饱和磁化强度都快速下降,这表明在x比较小时,3d次晶格的Co-Co之间的铁磁交换作用起主导作用,而在x比较大时,3d次晶格中反铁磁交换作用起主要作用;在约234 K观察到了Nd2Co14Mn3化合物的自旋重取向现象.
The Nd2Co17-xMnx compounds have a rhomhedral Th2Zn17-type structure. Their unit-cell volumes increase slowly with increasing x, then rapidly with the further increase of x. This implies there is a positive spontaneous volume magnetostriction in the magnetic state for Nd2Co17-xMnx compounds. The Curie temperature and the saturation magnetization at 4.2 K of these compounds rapid drop with increase of x. This implied there is a crossover between the low x range, where the Co sublattice is ferromagnetic and the Co-Co ferromagnetic interaction is dominant, and the high x range where the antiferromagnetic interactions play a substantial role. The spin reorientation is observed at about 234 K in the Nd2Co14Mn3 compound.
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