Ultrasonic speed and absorption in oxide beryllium ceramics

The velocity of propagation of ultrasonic waves and absorption of ultrasound in beryllium ceramic samples of various densities, configurations, and sizes, differing in the molding method and degree of texturing of BeO microcrystals, have been investigated at room and low temperatures (about 100 K). It was found that with an increase in the density of the samples, the speed of propagation of ultrasound in them increases. It is shown that the speed of ultrasound in beryllium ceramics without specially introduced impurities weakly depends on the frequency in the range of 5 - 25 MHz. Tab. 5, ill. 1, bibliography: 13 titles.