本文通过第一性原理计算研究了MgCu2和IVfeS相的结构稳定性、电子结构和弹性性能等。计算的结构参数与实验理论结果非常吻合。合金形成热和结合能计算结果表明,MgCu2具有较强的结构稳定性,Mg2S具有较强的合金化能力。计算的剪切模量G、体模量B和杨氏模量£显示:MgCu2属于延性材料,MgzSi属于脆性材料,IVfeS的刚度较大。态密度(DOS)和MulUken布居数的计算表明,IVfeS离子键较强。
The properties of MgCu2and Mg2Si phases were discussed by the first-principle calculations,which include electronicstructure,structural stability and elastic properties.The calculated structural parameters tally with experimental and previoustheoretical data.The results of formation heat and cohesive energy indicate that MgCu2has stronger structural stability andMg2Si has stronger alloying ability.The calculated results of shear modulus G,bulk modulus B and Young^modulus E indicatethat MgCu2is ductile material and Mg2Si is brittle material with larger stiffness.The calculation results of density of state(DOS)and population analysis show that the Mg〗Si has stronger ionic bond.