金属间化物（Sm_（1－x）Y_x）_2Fe_（17）N_y中N原子占位的点电

The Point-Chargge Model for N Atoms Occupation of Intermetallic Compounds(Sm1-xYx)2Fe17Ny

通过穆斯堡尔谱等手段研究赝三元金属间化物（Ｓｍ１－ｘＹｘ）２Ｆｅ１７Ｎｙ中的Ｎ原子占位机闭，并通过点电荷模型对Ｎ原子的占泣机制进行理论解释。由试验结果和点电荷模型结果得出以下结论：１）Ｎ原子占据９ｅ（６ｈ）和１８ｇ（３ｂ）两个间隙品位；２）Ｎ原子的双重占位与自旋磁结构密切相关，是单轴各向异性产生的主要原因。

ossbauer spectroscopy and the epoint-charge model were used to study themechanism of N atoms occupation in(Sm1-xYx)2Fe17Ny alloy.The experimental results and thepoint-charge modcl results confirmed the following facts:1)The N atoms occupied not only 9e(6h)sites but also 18g(3b)sites;2)The double occupation of N atoms was closely consistentwith the spin magnctic structure,which was the main reason of unial-axis anisotropy.