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Equation of state of Al for compressed and expanded states from first-principles calculations

机译:根据第一性原理计算的压缩和扩展状态的Al状态方程

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摘要

Results of theoretical calculations of equation of state and critical temperature of Al are presented using a three-term EOS model. In this model cold (0 K) term is calculated from first-principles method near normal conditions. Cold curve is extrapolated to ultrahigh pressures using Thomas- Fermi-Dirac model and to expanded states using a soft sphere function. Electron thermal term is calculated using Thomas-Fermi statistical model. Ion-thermal term is calculated using the modified Cowan model. In expanded state, the adjustable parameters of the modified Cowan model are tuned using quantum molecular dynamics (QMD) results. In compressed state, P-ρ and Us-Up Hugoniots derived using our results show good agreement with the reported experimental results. In expanded state, the estimated critical temperature shows good agreement with the reported results and pressure versus internal energy along isochores show reasonably good agreement with the reported experimental results.
机译:利用三项EOS模型,给出了Al的状态方程和临界温度方程的理论计算结果。在此模型中,冷态(0 K)项是根据接近正常条件的第一原理方法计算的。使用Thomas-Fermi-Dirac模型将冷曲线外推到超高压,使用软球函数将冷曲线外推到膨胀状态。电子热项是使用Thomas-Fermi统计模型计算的。使用修正的Cowan模型计算离子热项。在扩展状态下,使用量子分子动力学(QMD)结果调整修改后的Cowan模型的可调整参数。在压缩状态下,使用我们的结果得出的P-ρ和Us-Up Hugoniots与报道的实验结果显示出良好的一致性。在膨胀状态下,估计的临界温度与报告的结果显示出很好的一致性,等压线的压力与内部能量的关系与报告的实验结果显示出了很好的一致性。

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