The activation volume for type-I dipoles in lanthanum-doped strontium fluoride
- 30 June 1980
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 13 (18) , 3449-3455
- https://doi.org/10.1088/0022-3719/13/18/013
Abstract
The audio-frequency complex dielectric constant has been measured for lanthanum-doped strontium fluoride at pressures up to 0.4 GPa over the temperature range 240-260K. Consequently the reorientation of a Type-I dipole (substitutional rare-earth and nearest-neighbour interstitial fluorine charge compensator) has been studied. The activation volume for the motion is found to be 3.26 cm3 mol-1. For comparison, a theoretical value of 3.29 cm3 mol-1 is calculated using Flynn's dynamical diffusion model (1972). In addition, the thermal expansion coefficient of the activation volume is found to be negative and the compressibility is about an order of magnitude larger than that of the bulk material.Keywords
This publication has 8 references indexed in Scilit:
- Activation volume for interstitial motion in strontium fluoridePhysical Review B, 1980
- Activation Volume for Vacancy Motion in Calcium FluoridePhysica Status Solidi (b), 1980
- Electric dipoles in rare-earth-doped Sr. Relaxation parameters and dipole-dipole interactionPhysical Review B, 1978
- Calculation of the migration volume of vacancies in ionic solids from macroscopic parametersPhysica Status Solidi (a), 1978
- Ionic-thermocurrent study of the dipole relaxation and equilibrium in Gd-doped SrPhysical Review B, 1977
- Pressure and Temperature Derivatives of the Low-Frequency Dielectric Constants of the Alkaline-Earth FluoridesPhysical Review B, 1972
- Optical and dielectric properties and lattice dynamics of some fluorite structure ionic crystalsProceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1970
- Interstitial Atomic Diffusion CoefficientsPhysical Review B, 1949