Accession Number:

ADA184754

Title:

Defect Characterization in Quartz and Related Materials.

Descriptive Note:

Final rept. Apr-Dec 83,

Corporate Author:

OKLAHOMA STATE UNIV STILLWATER DEPT OF PHYSICS

Report Date:

1987-06-01

Pagination or Media Count:

150.0

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.

Subject Categories:

  • Electricity and Magnetism
  • Ceramics, Refractories and Glass
  • Electrical and Electronic Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE