Temperature dependence of Frenkel-defect formation energy deduced from diffusion of sodium in silver chloride

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Abstract
The anomalously large excess ionic conductivity displayed by AgCl at high temperatures has been variously interpreted in terms of the onset of a second type of cation interstitialcy mechanism, or alternatively as due to a decrease in the Frenkel-defect formation energy with increasing temperature. A detailed measurement of the temperature dependence of the diffusivity of substitutional sodium-ion tracer in AgCl is here shown quantitatively to confirm the latter of these possibilities.