[Hao Yan-Ming] Tianjin Univ Sci & Technol, Coll Sci, Tianjin 300222, Peoples R China
; [Yan Da-Li
; Fu Bin
; Wang Li-Qun] Tianjin Normal Univ, Dept Phys, Tianjin 300384, Peoples R China
; [Hao Xiao-Peng
; Wang Bao-Yi] Chinese Acad Sci, Inst High Energy Phys, Key Lab Nucl Anal Tech, Beijing 100049, Peoples R China
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.