Ionic conductivity measurements as a function of temperature between 100 and 800°C have been performed for NaCl, KCl, KI, and CsI monocrystals. The specimens were either chemically pure or doped with Ca2+, Sr2+, and Mg2+. An ac method using a careful electrode design and a precise temperature control was applied. The experimental data were submitted to an overall theoretical analysis based on the Schottky-Stasiw-Teltow model. In this way coherent results have been obtained. Precipitation of Sr in NaCl was observed and its perturbing effect eliminated. In CsI, the dominanace of anion motion was confirmed and additional influence of interstitial migration detected. Other mechanisms which appear to play a role in crystalline non perfect specimens or in the upper temperature range are discussed in relation with the usual theortical model.
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Nadler et al. (1973) studied this question.