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考虑热效应的Vinet状态方程及其应用

DOI: 10.11858/gywlxb.2004.02.003, PP. 109-115

Keywords: 状态方程,爱因斯坦模型,热物理性质

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Abstract:

基于爱因斯坦模型将Vinet等人提出的关于金属固体的通用物态方程推广到包括热效应。采用最近邻普遍化Lennard-Jones势描述金属离子之间的有效配对相互作用,将每个离子的势能展开为离子位移的二阶泰勒级数,从而推导出爱因斯坦温度和Grüneisen常数的解析表达式,该表达式只与体积有关而与温度无关。推广方程包括的7个参数只有5个是独立的,在高于德拜温度时,只需要4个参数。对典型金属及两种非金属材料计算的结果与实验符合得很好。

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