利用高精度高频超声技术 ,在室温常压下 ,脉冲回波重合法测定了四方晶系 YVO4 和分别掺质 1at- % ,2 at- % Nd3 + 的 Nd:YVO4 晶体的声速 ,根据声波沿晶体不同对称方向传播的纵波和横波速度 ,得到六个独立的二阶弹性常数 C11,C4 4,C66,C3 3 ,C12 和 C13 ,由此计算了热力学参数德拜温度 ,并比较 Nd3 + 掺入量对它们的影响。还报道了弹性常数 C66的异常变化 ,在一对 (0 10 )面上 ,沿[0 10 ]极化方向施加对顶挤压时 ,相应的横波脉冲回波强度急剧减弱 ,传播时间也发生明显变化 The velocity of the tetragonal YVO4 and the Nd: YVO4 crystals doped with 1at-% and 2 at-% Nd3 + were respectively measured at room temperature under normal pressure and pulse echo by high-precision high-frequency ultrasonic technique. The compressional and shear wave velocities propagating in different symmetry directions of the crystal are obtained, and six independent second-order elastic constants C11, C4 4, C66, C3 3, C12 and C13 are obtained, and the Debye temperature of the thermodynamic parameter is calculated, Influence on them. The abnormal change of the elastic constant C66 was also reported. When a pair of (0 10) planes were applied to the dome extrusion along the [0 10] direction, the intensity of the corresponding shear wave pulse echoes abruptly and the propagation time also became obvious Variety