第41卷第2期2024年4月J.At.Mol.Phys.,2024,41:026005(6pp)MgsSn4-xM.纪原子与分子物理学报JOURNALOFATOMICANDMOLECULARPHYSICS结构稳定性与弹性常数的第一性原理计算Vol.41No.2Apr.2024邢旭,尹成斌,马贝贝,王(西南林业大学机械与交通学院,昆明650024)摘要:利用基于密度泛函理论的CASTEP软件构建MgsSn4-M(M=Al、Cu;x=0、1或2)晶体结构模型,采用第一性原理计算其晶格常数、结构稳定性和弹性常数,并分析不同量的M原子固溶于Mg,Sn后体系的电子特性、弹性性能和本征硬度,计算结果表明,M原子能自发固溶于MgzSn相,且所得Mg.Sn4-Mx(x=1或2)晶体结构均可稳定存在;当2个M原子固溶于Mg2Sn时,使其晶体结构由立方晶系转变为四方晶系,态密度分析表明,M原子固溶后体系原子存在明显轨道杂化现象,表现出较强的共价键,增加M原子固溶量不会改变各原子对态密度的贡献规律,但会提高该原子对电子对态密度的贡献度:弹性性能和本征硬度分析表明:Mg2Sn中固溶M原子后,体系力学性能仍稳定,增加M原子固溶量,体系硬度逐渐降低,韧塑性不断提高,即M原子固溶量增加能提升体系的韧塑性.关键词:MgzSn;第一性原理;电子结构;弹性常数;本征硬度中图分类号:TG146.2First-principlescalculationsonthestructuralstabilityandelasticconstantofMg.Sn4-,M.远文献标识码:AD01:10.19855/j.1000-0364.2024.026005XINGXu,YINCheng-Bin,MABei-Bei,WANGYuan(SchoolofMachineryandTransportation,SouthwestForestryUniversity,Kunming650024,China)Abstract:UsingtheCASTEPsoftwarebasedondensityfunctionaltheory,thecrystalstructuremodelofMgsSn4-xM,(M=Al,Cu;x=0,1or2)wasconstructed,anditslatticeconstant,structuralstabilityandelasticconstantwerecalculatedbyfirst-principles,aswellastheelectronicproperties,elasticpropertiesandintrinsichardnessofthecrystalstructuremodelwithdifferentamountsMatomssolidsolutioninMg2Snphasewereana-lyzed.ThecalculationresultsshowthatthesolidsolutionoftheMatomsinMg2Sncangeneratespontaneously,andtheobtainedMg:Sn4-→M(x=1or2)crystalstructurecanexiststably;thecrystalstructureconvertsfromcubicsystemtotetragonalsystemwhentwoMatomsdissolveinMg2Sn.TheanalysisresultsofdensityofstatesindicatethattheatomsinthesystemexistobviousorbitalhybridizationbyMatomssolidsolution,thenshowstrongcova...