Abstract
Recently measurements have been published on the temperature dependence of the attenuation and velocity of ultrasonic shear waves in fused silica, at frequencies of 66 and 201 kc/sec1 and also at 10 mc/sec.2 They show a very pronounced peak in attenuation which lies at approximately 35°K and a flat minimum in velocity at about 65°K for the frequencies 66 and 201 kc/sec. The measurements of McSkimin at 10 mc/sec have a gap in the temperature range between 4.2°K–77.3°K, thus preventing the exact location of the extrema. To complete this, measurements were made at 20 mc/sec in the temperature range from 1.6°K–80°K. The results show a peak in attenuation at about 45°K and a minimum in velocity at about 75°K. This shift with frequency indicates a relaxation phenomenon as the cause for the very high increase in attenuation between 30° to 50°K. This may be due to sidewise vibrations of the oxygens in the Si–O–Si bonds. These vibrations should not occur for quartz crystals for which the oxygens are in minimum energy positions.
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