Structural and magnetic properties of Tb(Fe1-xNix)(11.3)Nb-0.7 compounds

Structural and magnetic properties of Tb(Fe1-xNix)(11.3)Nb-0.7 compounds ha ve been investigated. The x-ray diffraction patterns show that all compound s crystallize in the ThMn12-type structure and that all samples are almost of single phase. The lattice constants monotonously decrease with increasin g Ni content. The Curie temperature T-c clearly increases and the saturatio n moment M-s monotonously decreases with increasing Ni content. X-ray diffr action patterns of aligned samples at room temperature show that for x less than or equal to 0.2 the easy magnetization direction is in the plane whil e for the x = 0.25 compound the easy magnetization direction is along the c -axis. In the compounds with x less than or equal to 0.20 spin reorientatio n occurs above loom temperature whereas in the compounds with x > 0.2 there is a spin reorientation below room temperature. It has been found that Ni contributes positively to the T-sublattice moment M-T.