Frequency change and elastic constants of quartz irradiated by 1 MeV electrons

The fractions of frequency change Δf/f for quartz resonator plates exposed to 1 MeV electrons are measured as a function of electron fluence up to 2x1017 electrons/cm2, from which the adiabatic elastic constants of c44, c14 and c66 are determined. The ratio of these fractional changes is found to have a correlation of Δc44/c44:Δ/c14///c14/:Δc66/c66=1.3:3.1:1.0. The Δf/f values against fluence are calculated for various cut angles. The result indicates that the frequency in AT-cut resonators decreases a little and then increases ( -- 10-5), but in BT- and Y-cut resonators a drastic increase and then a decrease (10-3 -- 10-2) are expected. (auth.)