Ionic Conduction and Diffusion in Single Crystals of SrCl2

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Abstract
This paper reports the results of measurements of electrical conductivity and tracer (90Sr and 36Cl) diffusion in single crystals of SrCl2, both nominally pure and doped with the aliovalent ions Y3+ and Na+, in the temperature region 20° < T < 780°C. The conductivities for nominally pure crystals agree well (within a factor of 1.5) with some for a more limited range (150° to 650°C) recently published by Barsis and Taylor. Moreover, the observed effects of the addition of aliovalent impurities are similar. Some of the detailed conclusions reached are different, however. Insofar as it can be pressed, the analysis of the data leads to the following conclusions. (i) The predominant imperfections are anionic Frenkel defects. (ii) The ionic transport is overwhelmingly anionic under all conditions. (iii) The experimental correlation factors cannot distinguish between an interstitialcy and a vacancy‐transport mechanism but general considerations favor the latter. (iv) The behavior of the diffusion and conductivity at lower temperatures (T < 500°C) indicates that complexes of defects form, but no detailed information is derivable.

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