Abstract
The temperature dependence of the electrical conductivity of polycrystalline alkali nitrates between room temperature and their melting temperatures has been studied. The lg σ =f(1/T) dependence is a discontinuous line consisting of regions of impurity and intrinsic conductivity. The conductivity changes discontinuously at a first-order phase transition, during the transition from a structure with lower symmetry to one with higher symmetry, and vice versa. The activation energy for ionic migration in the series of alkali nitrates is at a minimum for potassium nitrate.
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Kolomin, L.G., Protsenko, P.I. Electrical conductivity of polycrystalline alkali nitrates in stable states and at phase transitions. Soviet Physics Journal 11, 105–109 (1968). https://doi.org/10.1007/BF00822477
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DOI: https://doi.org/10.1007/BF00822477