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基于第一性原理的平面波赝势方法(PWP)的局域密度近似(LDA)/广义梯度近似(GGA)计算了β-CaSiO3的几何结构、能带结构、态密度和光学性质.其晶胞参数优化结果与实验相比,LDA/GGA的相对误差为-3.62%/1.91%.对优化后的β-CaSiO3晶体进行能带结构分析表明,β-CaSiO3晶体为间接带隙结构,禁带宽度Eg(LDA)=5.53eV,Eg(GGA)=5.18eV.对态密度图及Mulliken电荷分布的分析表明,Ca的d轨道有电子分布,即Ca的s、P、d轨道均参与了成键.β-CaSiO3晶体中Ca与SiO3基团之间形成的化学键主要是离子键,而Si与O之间的化学键是共价键.

参考文献

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