Electrical Relaxation in Calcium Fluoride Doped with Thorium and Zirconium.

Abstract

Audio frequency electrical relaxation measurements have been performed on CaF2:Th and CaF2:Zr. The nominal concentrations in both cases are 0.1 and 1.0 mol-%. The measurements have been carried out over the temperature range 0.008 to 400K using a fully automated dielectric spectrometer operating at seventeen frequencies from 10 to 100,000 Hz. The spectrum for the 0.1 mol-% thorium doped material consists of three relatively strong relaxations along with two weak relaxations. For the 1.0 mol-% material, the high temperature relaxation, if it exists, is masked by the DC conductivity. Only small changes in the relaxations are noted with a change in the nominal concentration. For 0.1 mol-% CaF2:Zr, seven relaxations are observed all of which appear to be important as significant changes in the spectrum are observed when the nominal concentration is increased to 1.0 mol-%. Models for some of the complexes responsible for the relaxations are presented. Keywords: Ion conductor; Defect structure.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1986
Accession Number
ADA172366

Entities

People

  • John J. Fontanella
  • Mary C. Wintersgill

Organizations

  • United States Naval Academy

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies
  • Weapons Technologies

DTIC Thesaurus Topics

  • Audio Frequency
  • Chemistry
  • Control Systems
  • Crystal Defects
  • Crystal Lattices
  • Electrical Conductivity
  • Elements
  • Fluorine
  • Frequency
  • High Temperature
  • Low Temperature
  • Materials
  • Military Research
  • Physics
  • Security
  • United States
  • United States Naval Academy

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  • Materials Science and Engineering.