中文摘要：

通过X射线衍射、磁测量及正电子湮没谱等手段研究了Tb2AlFe16-xMnx（x=1—8）化合物的结构和磁性.X射线衍射研究结果表明Tb2AlFe16-xMnx化合物具有六角相的Th2Ni17型结构.室温下的正电子湮没实验研究表明,Mn对Fe的替代导致化合物中的铁磁相互作用减弱,并且化合物中存在着较强烈的磁弹耦合效应.磁测量研究结果表明,Mn的替代导致Tb2AlFe16-xMnx化合物的居里温度及自发磁化强度急剧下降.

英文摘要：

The structural and magnetic properties have been investigated by means of X-ray diffraction,magnetization measurements,and positron annihilation technique.The X-ray diffraction shows that the Tb2AlFe16-xMnx（x=1—8） compounds have a hexagonal Th2Ni17-type structure.The positron annihilation spectra show that Mn substitution for Fe has the ferromagnetic interaction decreased,and that there exists a strong magnetoelastic effect in Tb2AlFe16-xMnx compound.The magnetization measurement shows that the Curie temperature and the spontaneous magnetization of Tb2AlFe16-xMnx compounds decrease rapidly with increasing x.