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机构地区:[1]凯里学院,贵州凯里556011
出 处:《凯里学院学报》2017年第6期1-4,共4页Journal of Kaili University
基 金:贵州省科学技术基金项目(黔科合J字[2011]2114);贵州省普通高等学校创新人才团队(黔教合人才团队字[2012]06)
摘 要:采用密度泛函理论中的有限电场方法,优化得到团簇Mg_n(n=2~15)的基态构型,运用广义梯度近似(GGA)下的交换关联势(PBE)和有效芯势(ECP),选择自旋非限制性和双数值极化基组,研究了团簇Mg_n(n=2~15)的平均束缚能Eb、HOMO-LUMO能隙Gap、偶极矩EDM和极化率EDP等特性随总原子数n增加的演化规律.结果表明,团簇Mg_n(n=2~15)的特性随总原子数n增加变化显著,同时有金属性与半导体属性的转变行为.The ground state configuration of Mgn ( n = 2 ~ 15 ) clusters have been optimized by finite field method based on density functional theory, and the evolution behavior of average binding energy, HOMO- LUMO energy gap, electrical dipole moment (EDM) and electrical dipole polarizability (EDP) of Mgn (n = 2 ~ 15 )clusters variation with increasing total atom number of clusters, have been investigated by the generalized gradient approximation (GGA) of PBE exchange associated functions including effective core potential ( ECP), spin unrestrictive and double - number polarization group. The results showed that these properties Mgn (n = 2 ~15 ) clusters change significantly with the increase of the total number of atoms n, at the same time, the transformation behavior from metal to semiconductor have been found.
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