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.
Possible geometrical structures and relative stability of alkali metal nitride compound ( K3 N) n ( n = 1, ... ,5 ) clusters are studied with a hybrid density functional theory (B3LYP) with 6-311G * basis sets. Bond property, charge distribution, vibrational property and stabilities of the stablest isomers of ( K3 N ) n ( n = 1, ..., 5 ) clusters are analyzed. It shows that the stablest isomers of ( K3 N) n ( n = 1 ,... ,5 ) clusters are changing gradually from planar structure to three-dimensional structure. ( K3 N) 4 and ( K3 N ) 5 are layered structure similar to crystal. Coordination numbers of N atoms are usually 5 or 6. Natural charges of N atom and K atom are about - 1. 608 e and + 0. 550 e, respectively. A strong ionic bond exists between K atom and N atom. Dynamic stability of ( K3 N) 4 cluster is higher than that of other clusters.
出处
《计算物理》
EI
CSCD
北大核心
2011年第5期773-780,共8页
Chinese Journal of Computational Physics
基金
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