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A strain-rate cycling test during the Blaha effect measurement was carried out at 80–300 K for KCl:Li+ (0.5 mol % in the melt) and KCl: Na+ (0.5 mol % in the melt). We attempted to select the most suitable force-distance relation between a dislocation and the monovalent cation impurity among the three models, which are a square force-distance relation, a parabolic one, and a triangular one taking account of the Friedel relation the groping for the most suitable force-distance relation was conducted by following three relationships: the relation between effective stress and temperature, the dependence of strain-rate sensitivity due to the impurities on temperature, and the proportionality of Δ H(T). The Δ H(T) is the activation enthalpy for the interaction between a dislocation and an impurity as a function of temperature. As a result, the square force-distance relation seemed to be the most suitable of the three for KCl:Na+. However, it was difficult to select the most suitable relation of the three for KCl:Li+. Furthermore, on the three force-distance relations, critical temperature, Tc, and ΔH(Tc) were obtained for both the specimens.