锗酸铋晶体的超声特性  

ULTRASONIC PROPERTIES OF Bi_(12)GeO_(29) CRYSTAL

作　　者：张谦琳[1] 

机构地区：[1]中国科学技术大学

出　　处：《声学学报》1989年第3期220-225,共6页Acta Acustica

摘　　要：本文采用超声脉冲回波法在4.2K—300K温区内测试了锗酸铋晶体[110]和[111]晶向的超声纵波衰减与温度的关系,结果在50K附近均出现由于激活弛豫过程所引起的大的异常衰减峰;本文还用脉冲回波重合法精密测定了[100],[110]和[111]晶向的超声纵波和横波的声速,并由此计算出弹性常数C_(11),C_(44)和C_(12)。Temperature dependences of ultrasonic longitudinal wave attenuation have been measured for bismuth germanium oxide in th [110] and [111] directions from 4.2 K to 300 K using ultrasonic pulse echo technique. There is a large anomalous absorption peak in the vicinity of 50 K in the [110] and [111] directions. This behavior indicates an activated relaxation process of Bi12GeO20 crystal itself.The sound velocities of longitudinal and shear waves in Bi12GeO20 crystal have accurately been measured in the [100] , [110] and [111] directions with pulse-echo-overlap (PEO) technique anh the elastic constants C11,C44 and C12 have been determined.

关 键 词：锗酸铋 晶体 超声特性 超导体 

分 类 号：TM262.014[一般工业技术—材料科学与工程]