The two‐ and four‐probe conductivities of single‐crystal sodium beta‐alumina ( Na 2 O · 8 Al 2 O 3 ) were investigated over the range of 25°–300°C. After pretreating with liquid sodium at 300°C, the two‐probe conductivity, above 140°C, was given by KT = 3300 thinsp ; exp thinsp ; ( − 3650 / RT ) . The conductivity at 180°C remained essentially constant up to about 140 mA/cm 2 .
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Fielder et al. (1975) studied this question.