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Importance of dispersion in density functional calculations of cesium chloride and its related halides

机译:分散度在氯化铯及其相关卤化物的密度泛函计算中的重要性

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摘要

The ionic compound cesium chloride adopts a cubic crystal structure bearing the same name. However, ab initio electronic structure calculations based on density functional theory methods using generalized gradient approximation functionals do not predict that cesium chloride adopts this phase. In this paper we apply semiempirical methods (density functional theory plus a pairwise dispersion correction) to account for missing van der Waals interactions within cesium chloride. The C_6 and R_0 dispersion parameters for cesium are established within Grimme's DFT + D2 formalism. Inclusion of the dispersion corrections is found not only to improve the quality of structures in comparison to experiment for all cesium halides, but also leads to the correct prediction of the ground-state phase under ambient conditions.
机译:离子化合物氯化铯采用名称相同的立方晶体结构。但是,基于密度泛函理论方法并使用广义梯度逼近泛函的从头算电子结构计算不能预测氯化铯采用该相。在本文中,我们应用半经验方法(密度泛函理论加成对色散校正)来说明氯化铯中缺少的范德华相互作用。铯的C_6和R_0分散参数是在Grimme的DFT + D2形式主义中建立的。与所有卤化铯的实验相比,发现包括色散校正不仅可以改善结构质量,而且可以正确预测环境条件下的基态相。

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  • 来源
    《Physical review》 |2013年第5期|054112.1-054112.7|共7页
  • 作者单位

    Nanochemistry Research Institute, Department of Chemistry, Curtin University, P.O. Box U1987, Perth, Western Australia 6845, Australia;

    Nanochemistry Research Institute, Department of Chemistry, Curtin University, P.O. Box U1987, Perth, Western Australia 6845, Australia;

    Material Science and Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA;

    Material Science and Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA;

    Nanochemistry Research Institute, Discipline of Physics and Astronomy, Curtin University, P.O. Box U1987, Perth, Western Australia 6845, Australia;

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  • 正文语种 eng
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  • 关键词

    inorganic compounds; crystal binding; cohesive energy; electron density of states and band structure of crystalline solids;

    机译:无机化合物晶体结合内聚能态固体的电子密度和能带结构;

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