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Optical Properties of the High-Pressure Phases of SnO_ 2: First-Principles Calculation

机译:SnO_ 2高压相的光学性质2:第一性原理计算

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We present a detailed investigation on the optical properties, including dielectric function, reflectivity,absorption, refractive index, and electron energy-loss spectrum, of the high-pressure phase SnO_2 in the rutile,pyrite, fluorite, and cotunnite structures by using the density functional theory (DFT) plane-wave pseudopotential method. The results indicate that with the increasing of pressure the band gaps become larger, the density of states are broader, so the curves of optical properties have a little blue shift. Except that the fluorite phase has some metallic properties, the other three phases exhibit excellent dielectric behavior. Interestingly, the fluorite and cotunnite SnO_2 phases always have some special characteristics, such as higher plasma frequency, which need further fundamental and application research.
机译:我们通过使用密度来详细研究金红石,黄铁矿,萤石和铜矿结构中高压相SnO_2的光学性质,包括介电函数,反射率,吸收率,折射率和电子能量损失谱。泛函理论(DFT)平面波伪势方法。结果表明,随着压力的增加,带隙变大,态的密度变宽,因此光学性能的曲线几乎没有蓝移。除萤石相具有某些金属性质外,其他三个相均表现出优异的介电性能。有趣的是,萤石和辉石SnO_2相始终具有一些特殊的特性,例如较高的等离子体频率,这需要进一步的基础和应用研究。

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