Accession Number:

ADA172366

Title:

Electrical Relaxation in Calcium Fluoride Doped with Thorium and Zirconium.

Descriptive Note:

Interim rept.,

Corporate Author:

NAVAL ACADEMY ANNAPOLIS MD DEPT OF PHYSICS

Personal Author(s):

• Fontanella,John J.
• Wintersgill,Mary C.

Report Date:

1986-09-01

Pagination or Media Count:

17.0

Abstract:

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.

Descriptors:

• *ELECTRICAL CONDUCTIVITY
• *RELAXATION
• *CALCIUM FLUORIDES
• AUTOMATION
• CONDUCTIVITY
• HIGH TEMPERATURE
• DIELECTRICS
• ELECTRICAL PROPERTIES
• CRYSTAL DEFECTS
• ZIRCONIUM
• DOPING
• DIRECT CURRENT
• LOW STRENGTH
• SPECTROMETERS
• IONIC CURRENT
• THORIUM

Subject Categories:

• Crystallography
• Solid State Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE