Theoretical Studies on the Electronic Properties of Small TinNm(n+m≤6) clusters

Abstract

摘要过渡金属氮化物和碳化物易形成非晶态材料,这类物质一方面具有高熔点超硬度的典型共价化合物的性质,另一方面又具有很好的金属性质,因而越来越受到理论化学家和实验化学家的关注。但传统的实验方法难以表征这类物质的微观结构。为此,本文试图从量化计算的角度来讨论Ti、N原子如何形成TinNm团簇,以及不同组成的TinNm团簇具有的几何结构与电子性质。论文采用杂化密度泛函方法(B3LYP)、赝势基组(Ti采用Lanl2dz基组,N采用6-31G(d)基组),对各种组成的TinNm(n+m≤6)团簇进行几何结构预测,找出可能的同分异构体,并进行了频率计算,以确定是稳定构型。并在稳定构型的基础上分析了电子性质...Abstract Transition-metal nitrides and carbides can easily form non-crystal materials. On one hand, this class of substance exhibits high melting points and ultrahardness-properties typical of covalent compounds; On the other hand it also exhibits metallic properties. It continues to be of considerable experimental and theoretical chemist interest. However the traditional experimental metho...学位:理学硕士院系专业:化学化工学院化学系_物理化学(含化学物理)学号:20032511

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