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对爱因斯坦模型的修正及考虑热效应的三个通用状态方程

DOI: 10.11858/gywlxb.2007.03.009, PP. 269-278

Keywords: 状态方程,高压,热物理性质,热膨胀

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Abstract:

对固体考虑热效应的爱因斯坦模型进行了修正。指出考虑热效应的通用状态方程中不应该包含零点振动项,方程参数不应该直接取为参考温度下的实验值VR,BR,B′R和γGR,而应该取为零温下的数值V0,B0,B′0和γG0;提出了一种从VR,BR,B′R和γGR求解V0,B0,B′0和γG0的方法。将提出的方法应用于三个典型的通用状态方程,包括Baonza、mMNH和Vinet方程。数值结果表明,利用相同的实验参数对三个方程解出的参数,以及预测的零压和低压下的热物理性质差异很小,而且都与实验数据符合很好。这些结果表明,在零压和低压下预测热物理性质的精确度不足以用来判断各种通用状态方程的适用性。

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