Defect Characterization in Quartz and Related Materials.
Abstract
The substitutional aluminum ions present in all quartz require charge compensation. In as grown synthetic quartz, interstitial alkalis serve as the charge compensators. Irradiation at temperatures above 200-K replaces the alkali with either a proton or a hole trapped on an adjacent oxygen. Electrodiffusion (sweeping) can be used to replace the alkali with either a proton or another specific alkali. A study of the acoustic loss of a series of 5-MHz fifth overtone AT-cut resonator blanks as a function of sweeping and irradiation has been completed. No acoustic loss peaks were observed at temperatures less than 100 C which could be attributed to either the Al Li or AL-OH centers. Na-swept samples showed the expected large loss peak at 53 K while unswept samples had only very small 53 K peaks. This result shows that in as-grown quartz, lithium is the primary charge compensating ion. Irradiation removed the 53 K peak and introduced new peaks at 23, 100 and 135 K. During anneal, these peaks were found to track witht the AL-hole center.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1987
- Accession Number
- ADA184754
Entities
People
- Joel J. Martin
- Larry E. Halliburton
- Richard C. Powell
- William A. Sibley
Organizations
- Oklahoma State University–Stillwater