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利用“脉冲回波重合法”精密地测定了熔石英的2,3阶弹性模量C11,C44;C123,C144,C456,由应变能对应变的级数展开,获得了由2,3,4阶弹性模量表示系数的熔石英超声状态方程。计算到3阶弹性模量的状态方程,与Bridgman的实验值比较,在压力增加时偏离增加。但当计入4阶弹性模量效应后,在熔石英发生状态改变前的区域,则两者之间符合得很好。By making use of the "ultrasonic pulse echo overlap technique", the second and third oder elastic modulus of fused quartz had been measured. From the series expansion of strain energy, where the coefficients are expressed by the second, third, fourth order elastic modulus etc., the ultrasonic equation of state for isotropic fused quartz is derived. This equation of state fit the P-V data measured by Bridgman quite well.
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