Accession Number : ADP001511
Title : Characterization of Alkali Impurities in Quartz,
Corporate Author : ROME AIR DEVELOPMENT CENTER HANSCOM AFB MASS SOLID STATE SCIENCES DIV
Personal Author(s) : Euler,Ferdinand ; Lipson,Herbert G. ; Kahan,Alfred ; Armington,Alton F.
Report Date : 1982
Pagination or Media Count : 8
Abstract : We report acoustic loss measurements from room temperature to above 500 degrees of C on resonator disks fabricated from high-grade as-grown and swept synthetic quartz, containing both Li(+) and Na(+) alkali impurities. As-grown quartz disks showed an exponential rise of acoustic loss 1/Q with temperature T, starting above 200 degrees of C. Swept samples show the onset of a rise above 400 degrees of C and show high-temperature losses which increase irreversibly with time and are tentatively attributed to the presence of residual alkali. Loss peaks above 300 degrees of C were found in the swept disks. Some of these disappear after exposure to temperatures above 400 degrees of C.
Descriptors : *Frequency, *Control, *Symposia, *Quartz, *Impurities, Classification, Alkali metal compounds, Quartz resonators, Disks, Synthetic materials, Crystal growth, High rate, Crystal defects, Crystals, Resonators
Distribution Statement : APPROVED FOR PUBLIC RELEASE