Accession Number : AD0748259

Title :   Defect Equilibria in Alkaline Earth Fluorides Containing Rare Earth Ions.

Descriptive Note : Final rept. 1 Aug 70-31 Jul 71,

Corporate Author : NATIONAL BUREAU OF STANDARDS WASHINGTON D C

Personal Author(s) : Franklin,Alan D.

Report Date : MAR 1972

Pagination or Media Count : 58

Abstract : The point defects present in GdF3-doped CaF2, with concentrations ranging from 0.01 to 0.46 mole percent GdF3, have been studied using measurements of density, EPR, and dielectric and anelastic relaxation as a function of concentration and of annealing temperature in an He + HF atmosphere in the range 500C to 1100C. The unit cell contents increased in mass with increasing GdF3 concentration. The role previously suggested for cation vacancies in the annealing behavior appears untenable. The reorientation kinetics of the pair formed by association of the mobile interstitial F(-) ion with the immobile Gd(3+) ion were studied using EPR line-broadening and dielectric relaxation measurements, and some anelastic relaxation measurements were made as well.

Descriptors :   (*ALKALINE EARTH COMPOUNDS, CRYSTAL DEFECTS), (*CALCIUM FLUORIDES, *CRYSTAL DEFECTS), FLUORIDES, GADOLINIUM, DOPING, BAND THEORY OF SOLIDS, PARAMAGNETIC RESONANCE, DIELECTRIC PROPERTIES, EQUILIBRIUM(PHYSIOLOGY), RELAXATION TIME

Subject Categories : Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE