QUARTZ CRYSTAL AGING EFFECTS.
Abstract
Aging studies of 3 Mc units were made. Aging rates for cultured and swept cultured resonators were in the range 2 to 4 x 10 to the minus 9th power/wk during a 125 day period. The cultured units possessed a slightly higher average rate, 3.4 x 10 to the minus 9th power/wk, than the swept cultured ones, 2.5 x 10 to the minus 9th power/wk. Two units designated as cultured quartz exhibited frequency shifts of -.000007 when exposed to .0000014 rads of irradiation from a Cs-137 source. Post irradiation aging was at a rate of 2.5 x 10 to the minus 8th power/wk, approximately 8 times the normal rate. These units, because of the frequency shifts appear to be natural quarts improperly designated. Cultures swept units, similarly irradiated, exhibited no appreciable frequency shift or post irradiation aging. One 3 Mc unit of swept cultured quartz exhibited virtually no change in aging rate as a result of continuous drive at a 400 microamp level. An ultrasonic bonding method for welding aluminum ribbon to aluminum plated resonators was developed and gave strain free bonds and resonators of high Q, .0000015, and of low unwanted mode intensity.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1965
- Accession Number
- AD0623703
Entities
People
- R. B. Belser
- W. H. Hicklin
Organizations
- Georgia Tech