【摘要】 由等温体积弹性模量的定义及其与压强关系的假设出发,导出了一个新的适用于高压下碱卤晶体的三参量等温状态方程。计算了室温下NaCl晶体在0~30 GPa压强范围内、CsCl晶体在0~40 GPa压强范围内的相对体积以及NaCl晶体在0~30 GPa压强范围内的等温体积弹性模量,计算结果与实验值一致。对等温体积弹性模量及其对压强的一阶、二阶导数与压强的关系进行了讨论,指出压强趋于无穷大时的等温体积弹性模量是常数。更多还原

【Abstract】 From the definition of isothermal bulk modulus and an assumption of its relationship with the pressure,an isothermal three-parameter equation of state has been proposed,which is found to be applicable at high pressure.The proposed equation of state has been used to compute the pressure-volume behavior of NaCl crystal in the pressure range 0~30GPa and CsCl crystal in the pressure range(0~40GPa.)The isothermal bulk modulus in the pressure range 0~30GPa of NaCl crystal were also calculated.The results are in very good agreement with the experimental data.The pressure dependence of the isothermal bulk modulus B_T and its first-and second-order pressure derivative are discussed,and the bulk modulus increases continuously with the increasing pressure and has a finite value as p→∞.更多还原