立方晶体Bi12GeO20的三阶弹性常数

摘要

By using of the ultrasonic pulse-echo overlap technique, the dependence of natural rnwave velocity on the hydrostatic pressure and uniaxial stress in cubic crystal Bi12 GeO20 was rnmeasured for various longitudinal and shear elastic modes. From the experimental results, the rnvalues of all independent second- and third-order elastic stiffness constants of Bi12GeO20 crystal rnwere determined by means of the theory proposed by Thurston and Brugger.%用超声脉冲回波重合方法测量了立方晶体Bi12GeO20中九种不同模式纯纵波和rn切变波自然声速值随流体静压力和单轴压力的变化关系，由此实验结果，用Thurstonrn和Brugger的理论，确定了Bi12GeO20晶体全部独立的三阶弹性常数.