计算物理 ›› 2011, Vol. 28 ›› Issue (5): 773-780.

• 研究论文 • 上一篇    下一篇

(K3N)n(n=1,…,5)团簇结构与性质的密度泛函理论研究

陈玉红1,2, 王伟超1,2, 杜瑞2, 张致龙2, 张材荣1,2   

  1. 1. 兰州理工大学 甘肃省有色金属新材料省部共建国家重点实验室, 甘肃 兰州 730050;
    2. 兰州理工大学 理学院, 甘肃 兰州 730050
  • 收稿日期:2010-10-22 修回日期:2011-03-21 出版日期:2011-09-25 发布日期:2011-09-25
  • 作者简介:陈玉红(1972-),男,甘肃秦安,博士,教授,主要从事原子分子理论和团簇物理研究,E-mail:chenyh@lut.cn
  • 基金资助:
    国家自然科学基金(10547007);甘肃省自然科学基金(1010RJZA042);兰州理工大学博士基金(BS10200901)资助项目

Structure and Property of (K3N)n(n=1,…,5) Clusters: A Density Functional Study

CHEN Yuhong1,2, WANG Weichao1,2, DU Rui2, ZHANG Zhilong2, ZHANG Cairong1,2   

  1. 1. State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials, Lanzhou University of Technology, Lanzhou 730050, China;
    2. School of Science, Lanzhou University of Technology, Lanzhou 730050, China
  • Received:2010-10-22 Revised:2011-03-21 Online:2011-09-25 Published:2011-09-25

摘要: 利用密度泛函理论B3LYP方法,在6-311G*水平上对碱金属氮化物(K3N)n(n=1,…,5)团簇各种可能构型进行几何结构优化,预测各团簇的最稳定结构,并对其成键特性、电荷分布、振动特性及稳定性进行分析研究.结果表明,随着n的增大,(K3N)n(n=1,…,5)团簇的最稳定结构逐渐由平面结构向空间立体结构转变,(K3N)4、(K3N)5团簇为类似晶体的层状结构;团簇中N原子的配位数以5、6较多见;团簇中N原子的平均自然电荷为-1.608e,K原子的平均自然电荷为+0.550e,K-N键为较强的离子键;(K3N)4团簇有相对较高的动力学稳定性.

关键词: (K3N)n(n=1, …, 5)团簇, 密度泛函理论, 结构与性质

Abstract: Possible geometrical structures and relative stability of alkali metal nitride compound (K3N)n(n=1,…,5) clusters are studied with a hybrid density functional theory(B3LYP)with 6-311*-basis sets.Bond property,charge distribution,vibrational property and stabilities of the stablest isomers of (K3N)n(n=1,…,5)clusters are analyzed.It shows that the stablest isomers of (K3N)n(n=1,…,5) clusters are changing gradually from planar structure to three-dimensional structure.(K3N)4 and (K3N)5 are layered structure similar to crystal.Coordination rlnmhers of N atoms are usually 5 or 6.Natural charges of N atom and K atom are about-1.608e and+0.550e.respectively.A strong ionic bond exists between K atom and N atom.Dynamic stability of (K3N)4 cluster is higher than that of other clusters.

Key words: (K3N)n(n=1,…,5)clusters, density functional theory, structure and properties

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