Radiation Effects on Quartz Crystals and Oscillators, and Growth of Doped Quartz Crystals.
Annual scientific rept. 1 Dec 69-30 Nov 70,
HEBREW UNIV JERUSALEM (ISRAEL) DEPT OF PHYSICS
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Quartz crystals were grown by the hydrothermal method in NaOH solutions. Rates of growth in the AT and Z directions were measured for undoped and doped quartz Mg2, Ga3, V5, using various temperature gradients. All dopants, except Mg2, gave rates of growth lower than undoped quartz. Oscillators made of various synthetic and natural Brazilian crystals were irradiated with 5 MeV electrons and effects of irradiation on frequency and on Q-values were measured over the temperature range 77-550 degrees K. Frequency changes and reductions in Q appeared at various temperature ranges. For a High-Q SARP crystal 5 MHz in 5th harmonic the frequency change by irradiation with about 1,000,000 rads reached about 700 Hz, and appeared mainly below 200 degrees K, just where the strongest thermoluminescence appeared. With the same crystal Q-values at a few temperature ranges were found to be sensitive to irradiation, and in these ranges the crystal even ceased oscillating after irradiation. Most effects of irradiation were canceled by heating to about 500 degrees K. Other crystals exhibited similar radiation effects. Author
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