THE MAGNETIC PROPERTIES AND MOSSBAUER SPECTRA OF Y_2(Fe_(1-x)Ni_x)_(17)

The Curie temperature of Y_2(Fe_(1-x)Ni_x)_(17) varied with its nickel contents (x) and a maximum T_c of 625 K, occurred at x=0.3. In order to investigate the effect of the replacement of Fe atoms by Ni atoms on the magnetic properties of such compounds, easy directions of magnetization were determined by X-rays for different Ni contents, and the dependence of the saturation magnetization in a magnetic field up to 70,000 Oe on x values of the compounds was also studied. Mossbauer spectra of Y_2Fe_(17) and Y_2 (Fe_(0.9)Ni_(0.1))_(17) were taken ~1to ascertain order or disorder distributions of Ni atoms in the crystalline lattices. An explanation of the cause of variation of Curie temperature with the Ni contents of the compounds has been given on the basis of the above results.