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研究了Nd2Col7-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4.2K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234K观察到了Nd2Co14Mn3化合物的自旋重取向现象.
The structure and magnetism of Nd2Col7-xMnx (x = 0,1,3,5,7,9,11) compounds are studied. The Nd2Co17-xMnx compounds have the rhombohedral Th2Zn17 type structure. When x is small, , The unit cell volume of the compound increased slowly, while at the relatively large x, the unit cell volume of the compound rapidly increased with the increase of x, indicating that there is a positive spontaneous magnetism in the Nd2Co17-xMnx compound Stretching; as the x increases, the Curie point of the compound and the saturation magnetization at 4.2K both decrease rapidly, indicating that the ferromagnetic exchange between the 3d sub-lattices of Co-Co plays a dominant role at a small x , While at x larger, antiferromagnetic exchange plays a major role in the 3d sub-lattice; spin-reorientation of the Nd2Co14Mn3 compound is observed at about 234K.