材料期刊网

实验发现,三元化合物Y_2(Fe_(1-x)Ni_x)_(17)的居里温度T_c随镍含量x变化,当x=0.3时,居里温度呈现极值,T_c=625K。为了研究镍原子部分地替代铁原子后对磁性的影响,取不同镍含量的样品,用X射线测定了易磁化方向,并在高于70千奥斯特的强磁场下,测量了饱和磁化强度随镍含量x的变化。为了研究镍原子在此种晶体中是否有序分布在特定位置上,观测和对比了Y_2Fe_(17)和Y_2(Fe_(0.9)Ni_(0.1))_(17)的穆斯保尔谱线。根据所得的实验结果,分析了居里温度随镍含量变化的原因。

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.