金属间化物（Sm_（1－x）Y_x）_2Fe_（17）N_y中的各向异性机制探讨

通过Ｘ射线衍射和穆斯堡尔谱等手段研究金属间化物（Ｓｍ１－ｘＹｘ）２Ｆｅ１７Ｎｙ中的各向异性产生机制。结果表明，（１）Ｓｍ次格子的单轴各向异性较强，对总的各向异性贡献起主导机制；（２）Ｎ原子的占位与自旋磁结构密切相关，而与晶体结构无关，Ｎ原子的双重占位导致单轴各向异性；（３）Ｙ原子的择优占位导致晶体结构的变化，而对各向异性影响较小。

Study of Anisotropy Mechanism in (Sm_(1-x)Y_x)_2Fe_(17)N_y Intermetallic Compounds

The anisotropy mechanism in (Sm1-xYx)2Fe17Ny intermetallic compounds was studied by X-ray diffraction and Mossbauer spectrcacopy methods. The following conclusions were obtained : (1) The uniaxial anisotropy of Sm sublattice is stronger and is the main mechanism of the total anisotropy;(2) The occupiation of N atom is closely concerned with spin magnetic structure and is not related to crystal structure; the double occupiation of N atom leads to the uniaxial anisotropy; (3) The preferential occupiation of Y atom leads to the change of crystal structure and its influence on anisotropy is smaller.