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DFT-Calculations of Thermodynamic Parameters of ZnTe, ZnSe, ZnS Crystals

机译:ZnTe,ZnSe,ZnS晶体热力学参数的DFT计算

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Based on the analysis of the crystal and electronic structure of semiconductors ZnX (X=Te,Se,S) in cubic phase there have been built the cluster model for calculation of the geometric and thermodynamic parameters. The method of consideration of the boundary conditions for the proposed cluster models has been presented. Based on the results of ab initio quantum-chemical calculations of the crystal structure of molecular clusters the temperature dependence of formation energy ?E, formation enthalpy ?H, Gibbs free energy ?G, entropy ?S, specific heat capacity at constant volume CV have been defined. Computer calculations of the thermodynamic parameters were carried out with the help of density functional theory (DFT), using hybrid valence base set B3LYP. Also, in the work have been derived analytical expressions of temperature dependences of the presented thermodynamic parameters, which have been approximated by a quantum-chemical calculation data using mathematical package Maple 14.
机译:基于对立方相半导体ZnX(X = Te,Se,S)的晶体和电子结构的分析,建立了用于计算几何和热力学参数的簇模型。提出了考虑所提出的聚类模型的边界条件的方法。根据分子团簇晶体结构的从头算化学结果,在恒定体积CV下,形成能?E,形成焓?H,吉布斯自由能?G,熵?S,比热容的温度依赖性为:被定义。利用混合价基集B3LYP,借助密度泛函理论(DFT)对热力学参数进行了计算机计算。此外,在工作中还得出了所提出的热力学参数与温度的关系的解析表达式,已使用数学软件包Maple 14通过量子化学计算数据对其进行了近似。

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