NMR relaxation, ionic conductivity and the self-diffusion process in barium fluoride
- 14 January 1977
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 11 (1) , 55-73
- https://doi.org/10.1088/0022-3719/11/1/017
Abstract
Reports measurements of the electrical conductivity and 19F nuclear magnetic resonance (NMR) relaxation times T1, T2, T1 rho and T1D in BaF2 single crystals over a temperature range 300K-1200K. The dominant process responsible for the 19F spin relaxation is self-diffusion. The magnitude and temperature dependence of the relaxation times are satisfactorily interpreted using the Wolf theory. Absolute values of diffusion coefficients calculated from NMR relaxation data assuming a vacancy diffusion process are in excellent agreement (within 15%) with those calculated from ionic conductivity data using the Nernst-Einstein relation. From the temperature dependence studies, the diffusion parameters were determined. The formation enthalpy for a Frenkel pair was found to be 1.91 eV and migration enthalpies for free F- vacancies and F- interstitialcies were found to be 0.57 and 0.76 eV respectively.Keywords
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