Accession Number : ADA138327

Title :   Study of Defects Produced by the Growth, Post Treatment and Fabrication of Quartz.

Descriptive Note : Final technical rept. 15 Apr 80-30 Jun 83,


Personal Author(s) : Halliburton,L E ; Martin,J J ; Sibley,W A

PDF Url : ADA138327

Report Date : Oct 1983

Pagination or Media Count : 128

Abstract : In order to better understand the electrodiffusion process, we have systematically investigated various aspects of sweeping. Current-versus-time curves show an initial decay followed by a steady current. We believe that this steady current represents the migration of only one species of ion through the crystal. Once this steady state is reached, the temperature is slowly lowered and the ionic conductivity is measured versus temperature to obtain the activation energy. Alkalis show activation energies between .76 and 1.24 eV, while hydrogen shows an activation energy of 1.5 to 1.9 eV. Low-temperature IR absorption spectra, ESR spectra, and acoustic loss measurements were used to characterize the effects on the point defects of alkali and hydrogen electrodiffusion. Four-point bend fracture tests were carried out on a series of At-cut samples as a function of etching and hydrogen sweeping. Etched samples from hydrogen-swept bars showed a greater fracture strength (i.e, were more difficult to fracture) than etched samples from similar unswept bars.

Descriptors :   *Quartz, *Crystal defects, *Radiation damage, Crystal growth, Radiation absorption, Infrared radiation, Electrolysis, Diffusion, Electric current, Steady state, Ions, Conductivity, Activation energy, Electron spin resonance, Point defects, Acoustic measurement, Losses, Fabrication, Fracture(Mechanics), Strength(Mechanics), Holes(Electron deficiencies), Aluminum, Lithium, Sodium, Mobility, Thermoluminescence

Subject Categories : Crystallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE