Electrical Relaxation in Calcium Fluoride Doped with Thorium and Zirconium.
NAVAL ACADEMY ANNAPOLIS MD DEPT OF PHYSICS
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Audio frequency electrical relaxation measurements have been performed on CaF2Th and CaF2Zr. 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- CaF2Zr, 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.
- Solid State Physics