用密度泛函理论(DFT)中的杂化密度泛函B3LYP方法,在6-31G*水平上对Mg2B6、Mg4B10、Mg6B13和Mg8816团簇的层状结构进行了几何结构优化,并在同一水平上计算了其电子结构、振动特性和成键特性.结果表明:团簇中Mg-B键长在0.225~0.235 nm,B-B键长在0.154~0.191 nm;Mg原子的自然电荷在+1.24~+1.45e之间,B原子的自然电荷在-0.29~1.10e之间;Mg4B10团簇有相对较高的动力学稳定性.
参考文献
[1] | 王广厚.团簇物理的新进展(Ⅰ)[J].物理学进展,1994(02):121. |
[2] | 王广厚.遗传算法研究原子团簇[J].物理学进展,2000(03):251-275. |
[3] | Sarah D;Thomas V;Mortimer J et al.[J].Journal of Chemical Physics,2002,116:1536. |
[4] | Jun N;Norimasa N .[J].Nature,2001,410:63. |
[5] | Islam A K M A;Islam F N;Kabir S .[J].Journal of Physics:Condensed Matter,2001,13:1641. |
[6] | Gaitonde D M;Modak P;Rao R S et al.[J].Bulletin of Materials Science,2003,26:137. |
[7] | Uchiyama H;Shen K M;Lee S et al.[J].Physical Review Letters,2002,88:157002/1. |
[8] | Modak P;Rao R S;Godwal B K et al.[J].Pramana Journal of Physics,2002,58:881. |
[9] | Cui C X;Lui D B;Shen Y T et al.[J].Acta Materialia,2004,52:5757. |
[10] | Pablo D L M;Miguel C;Gustavo T .[J].Journal of Solid State Chemistry,2002,169:168. |
[11] | Tajima S;Masui T;Uchiyama H et al.[J].Current Applied Physics,2002,2:315. |
[12] | Xu M.;Xiao Z.;Wang Z.;Takano Y.;Hatano T.;Sagisaka K.;Kitahara M. Fujita D. .Local density of electronic states in MgB2 studied by low temperature STM and STS: direct evidence for a multiple-gap superconductor[J].Surface Science: A Journal Devoted to the Physics and Chemistry of Interfaces,2003(1/3):14-20. |
[13] | 闫世成,闫果,卢亚锋,周廉.Mg-B体系成相热力学研究[J].稀有金属材料与工程,2006(12):1892-1895. |
[14] | 韩欢庆,卢惠民,邱定蕃.MgB2烧结相变的研究[J].稀有金属材料与工程,2006(10):1602-1604. |
[15] | Yang C L;Zhang X;Han K L .[J].Journal of Molecular Structure(Theochem),2004,677:11. |
[16] | 陈玉红;张材荣;马军 .[J].物理学报,2005,54:166. |
[17] | Tzeli D;Mavridis A .[J].Journal of Physical Chemistry A,2005,109(47):10663. |
[18] | Masao N.[J].Physica C,2003(388-389):137. |
[19] | Dasari L V K P;Eluvathingal D J .[J].Journal of Molecular Structure(Theochem),2006,771:111. |
[20] | Islam AKMA.;Islam FN. .Ab initio investigation of elastic constants of superconducting MgB2[J].Physica, C. Superconductivity and its applications,2001(3):189-193. |
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