The polarization impedance of NaCl both pure and doped with 2.2-4.4*10 -4 mole fraction of SrCl 2 was measured in the frequency range 10 2 -2*10 4 Hz for temperatures between 480 degrees C and 790 degrees C, using rubbed graphite electrodes. Results depend on the thermal history but are relatively reproducible on cooling from 790 degrees C for the first time. Even then they do not agree overall with the linearized electrode blocking theory of Friauf (1954) and Macdonald (1953) which has been partially satisfactory for KCl. The discrepancies are difficult to explain in terms of the effects of gaps between crystal and electrode proposed by Miliotis and Yoon (1969) but this may be because of the lack of an adequate mathematical formulation of their model.
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Allnatt et al. (1972) studied this question.
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