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A survey is given of the existing theories of the ionic conductivity in crystals. The experimental log x ‐ 1/T curves usually consist of two straight parts with different slopes. This shape can be explained by several mechanisms ( Smekal, Jost and others). For the conductivity of mixed crystals, where the solute introduces additional vacancies, we derived a formula (formula III) which gives the conductivity as a function of the concentration of the solute and of the temperature. This formula also explains the kink in the conductivity curve. A method has been given which makes it possible to choose between the explanations for the kink in the conductivity curve in a given case. It is based on an analysis of the transition region between the two straight parts of the curves, and was applied to the conductivity of Li‐halides and LiHl‐MgHl 2 mixed crystals. It was found that in this case the kink in the conductivity curves could be described by formula III and not by the mechanisms proposed by others.
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Y. Haven (1950) studied this question.
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