SmMn_2Si_2金属间化合物的合成和结构研究

SYNTHESIS AND STRUCTURE OF INTERMETALLIC COMPOUND SmMn 2Si 2

用真空电弧熔炼合成ＳｍＭｎ２Ｓｉ２金属间化合物，并对合成条件进行研究，用Ｘ－射线衍射，电子衍射和Ｘ－射线光电子能谱法对合成的化合物进行结构表征。结果表明：ＳｍＭｎ２Ｓｉ２属ＴｈＣｒ２Ｓｉ２型体心四方晶系结构，晶格常数ａ＝３．９８５Ａ，ｃ＝１０．４９０Ａ，化合物中钐和硅的特征轨道，（３ｄ５／２，２ｐ３／２）结合能较单质状态分别减少０．６ｅＶ和增加０．３ｅＶ。

The ternary intermetallic compound SmMn 2Si 2 was synthesized by arc remelting of proper amounts of the constitute elements under Ar atmosphere.The conditions for synthesis were studied.The compound was characterized by XRD,XPS and electron diffraction.The results showed that the compound crystallized in body centered tetragonal structure of ThCr 2Si 2 type with a=0.3990 nm and c=1.0509 nm.The characteristic bind energies of Sm and Si in the compound(3 d 5/2 ,2 p 3/2 )were decreased by 0.6 eV and -0.3eV,respectively.