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

Personal Author(s) : Halliburton,Larry E ; Martin,Joel J ; Sibley,William A ; Powell,Richard C

PDF Url : ADA184754

Report Date : Jun 1987

Pagination or Media Count : 150

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.

Descriptors :   *QUARTZ, PIEZOELECTRIC CRYSTALS, *GLASS, *DEFECTS(MATERIALS), ALUMINUM, HOLES(ELECTRON DEFICIENCIES), ANNEALING, DOPING, CRYSTAL OSCILLATORS, IONIC CURRENT, INTERSTITIAL, ACOUSTIC PROPERTIES, IONS, LITHIUM, SODIUM, COMPENSATORS, ELECTRON TRANSFER, FLUORIDES, PROTONS, LASER BEAMS, TRAPPING(CHARGED PARTICLES), AGING(MATERIALS), HARDNESS, NEUTRON IRRADIATION

Subject Categories : Electricity and Magnetism
      Ceramics, Refractories and Glass
      Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE