ULTRASONIC ATTENUATION OF SHEAE WAVES IN AMOEPHOUS PdSiAg ALLOY

With the pulse-echo technique the ultrasonic attenuation of shear waves in amorphous PdSiAg alloy has been measured as a function of frequency and temperature. At room temperature an approximate f-squared frequency dependence was obtained between 10 and 240 MHz. Below 150 K, at fixe d frequency there is a slow increase of attenuation with decreasing temperature and a small ultrasonic absorption peak at 35 K. The linear dependence of the relative variation of the sound velocity is observed from 35 to 300K; the temperature coefficient of sound velocity is -1.58×10^-4/K.