ULTRASONIC ATTENUATION AND VELOCITY MEASUREMENTS IN QUARTZ
METAL HYDRIDES INC BEVERLY MASS
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The frequency dependence of the attenuation of compressional waves in X-cut quartz obeys an approximate square law consistant with the dislocation damping theory which predicts a square-law frequency dependence up to a resonant frequency. The behavior of the attenuation as a function of temperature below 100 K is in AGREEMENT WITH THAT PREDICTED BY A PHONONPHONON PROCESS. Above 40 K the thermal conductivity varies approximately as 1T while the specific heat increases linearly with the temperature between 40 and 150 K. The temperature dependence of the velocity measured in this experiment indicates that it remains constant at a value of 5.75 X 10 to the 6th power cmsec to within or - 0.02. In the region where the attenuation is rapidly changing there is apparently no associated velocity change.