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高压下声速温度系数的一种新算法

DOI: 10.11858/gywlxb.2000.04.001, PP. 241-246

Keywords: 高温高压,声速,声速的温度偏微商,顽火辉石

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Abstract:

从声速的定义出发,由热力学基本关系给出了声速温度系数(偏微商)的一种计算方法,以顽火辉石为例,计算结果显示,在40~140GPa压力范围内,其纵波、剪切波和体波的温度系数随压力的增大而逐渐减小,分别由40GPa时的-0.386、-0.251、-0.255m/(s·K)降至80GPa时的-0.298、-0.188、-0.204m/(s·K),120GPa时的-0.244、-0.148、-0.175m/(s·K)和140GPa时的-0.197、-0.131、-0.162m/(s·K)。将这一规律内推至零压得到(dK/dT)0=-0.0279GPa·K-1,与静高压下的实验值吻合很好。

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