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GIBBS: isothermal-isobaric thermodynamics of solids from energy curves using a quasi-harmonic Debye model

机译:GIBBS:使用准谐波德拜模型的能量曲线中固体的等温-等压热力学

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摘要

Given the energy of a solid (E) as a function of the molecular volume Θ(V), the program uses a quasi-harmonic Debye model to generate the Debye temperature (V), obtains the non-equilibrium Gibbs function G(V;p,T), and minimizes G to derive the thermal equation of state (EOS) V(p,T) and the chemical potential G(p,T) of the corresponding phase. Other macroscopic properties are also derived as a function of p and T from standard thermodynamic relations. The program focuses in obtaining as much thermodynamical information as possible from a minimum set of (E,V) data, making it suitable to analyse the output of costly electronic structure calculations, adding thermal effects at a low computational cost. Any of three analytical EOS widely used in the literature can be fitted to the p-V(p,T) data, giving an alternative set of isothermal bulk moduli and their pressure derivatives that can be fed to the Debye model machinery.
机译:给定固体的能量(E)作为分子体积Θ(V)的函数,该程序使用准谐波Debye模型来生成Debye温度(V),获得非平衡Gibbs函数G(V; p,T),并将G最小化以得出状态热方程(EOS)V(p,T)和相应相的化学势G(p,T)。还可以从标准热力学关系中得出其他宏观性质作为p和T的函数。该程序的重​​点是从最少的(E,V)数据集中获取尽可能多的热力学信息,使其适合分析昂贵的电子结构计算的输出,并以较低的计算成本增加热效应。文献中广泛使用的三种分析EOS中的任何一种都可以与p-V(p,T)数据拟合,从而给出另一组等温体积模量及其压力导数,可以将其输入Debye模型机。

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