Download - Radiation effects in natural quartz. Phonon-phonon interaction changes and annealing out of defects
500 ACTA METALLURGICA, VOL. 10, 1962
Radiation effects in natural quartz. Phonon-phonon interaction changes and annealing out of defects*
In-reactor irradiation measurements on single crystal natural quartz have been interpreted in terms of ultrasonic attenuation and velocity. Dif- ferences in attenuation before and after such irradiation have also been made as a function of both ultrasonic
frequency (up to 1500 Mc/sec) and temperature (down to 1.5-2.O”K). Phonon-phonon interaction at 500 Mc/sec is described with particular regard to
--_____. .- l Abstract of Paper 3 presented at the Conference on Internal
Friction held on 10 and 11 July, 1961 at Cornell University.
changes brought about by irradiation. Such attenu- ation-frequency and attenuation-temperature measu-
rements are again made after most of the defects have been annealed out as shown by attenuation-tem- perature measurements made up to about 510°C. It is also shown that quartz can be taken well above the a-+? transition temperature at 575°C without destroying the piezoelectric behavior when the tem- perature is again lowered below the transition tem- perature.
Metals Research Laboratory . THOMAS FITZGERALD
Brown University, ROHN TRUELL
Providence, Rhode Island