Abstract
Simultaneous measurements of the anion self-diffusion coefficient and of the ionic conductivity have been carried out in the intrinsic range (440–630°C) of pure Sr Cl 2 single crystals. The microtome sectioning method using the radiotracer 36Cl has been successfully applied to this difficult matrial. Accurate values of the correlation factor have thus been derived by applying the Nerst-Einstein relation. Results suggest that the Frenkel defects are predominant in the anion sub-lattice with the enthalpy and entropy of formation of 2.98 eV and 22 K, respectively. The chloride anions diffuse via the vacancy mechanism to which is added to a lesser extent an exchange mechanism where the ions successively occupy lattice and interstitial sites.
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