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密度泛函理论研究(MgO)n团簇吸附Ag原子的结构和电子性质

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摘要 采用密度泛函理论中的广义梯度近似(GGA)对(MgO)n吸附银原子的几何构型进行优化,并对能量、电荷分布和电子性质进行了计算.结果表明,当n≥4,银原子吸附在空位的结构是最低能量结构,随着银原子数的增加,增加的银原子易与原来的银原子形成银团簇.电荷布局数分析表明,银原子与(MgO)n团簇的相互作用主要是来自较弱的原子极化,吸附的银原子导致其近邻的原子电荷重新分布.通过与纯的氧化镁团簇对比发现,银原子的吸附对氧化镁团簇的成键特性和结构影响比较小.一阶能量差分、分裂能和电子亲和势表明Ag(MgO)4和Ag(MgO)6团簇是稳定的.
出处 《中国科学(G辑)》 CSCD 北大核心 2009年第4期592-599,共8页
基金 石河子大学高层次人才启动基金资助项目(编号:RCZX200747)
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