R_2Fe_(17-X)Al_XN_Y(R=Pr,Nd)化合物的结构和磁性

Structure and Magnetic Properties of R_2Fe_(17-X)Al_XN_Y Compounds

研究了Al替代和渗N对二元合金R_2Fe_(17)(R=Pr,Nd)的结构和磁性的影响。X射线衍射表明所有的母合金及其氮化物都结晶为Th_2Zn_(17)型结构。Al替代Fe和渗氮都使晶胞体积增大。R_2Fe_(17-X)Al_X化合物的居里温度随x增大,但R_2Fe_(17-X)Al_X(Al_X)N_Y化合物的居里温度比纯R_2Fe_(17)N_Y化合物的居里温度要低。室温饱和磁化强度随x减小,而且R_2Fe_(17-X)Al_XN_Y化合物的易磁化方向仍在基面内。

The effects of aluminum substitution and nitrogen absorption on the magnetic properties of the R_2Fe_(17) (R=pr,Nd) binary compounds have been studid. X-ray diffraction patterns showed that all the hosts as well as their nitrides crystallize in the rhombohedral Th_2Zn_(17)-type structure. Both the A1 replacement and nitrogen absorption result in an icreases of the unit cell volume. The Curie temperature of the R_2Fe_(17)_xA1_x compounds increases with increasing x. But the Curie temperature of the R_2Fe_(17)_xA1_xN_Y nitrides is smaller than that of corresponding R_2Fe_(17)N_y nitrides. The magnetization of the nitrides at room temperature decreases with x and the easy axis of magnetization for R_2Fe_(17)_xA1_xN_Y was also found to be in basal plane.