The exposure of sodium beta and beta' alumina tubes to flowing air causes the room temperature resistivities to increase considerably. Nonohmic behavior is observed within 48 h. Measurements indicate that a hydrated surface region is primarily responsible. Heating the tubes to 600°C in dry air is able to reversibly restore the original resistivities. The evolution of CO 2 at higher temperatures suggests that chemical reactions may be occurring during exposure.
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Bruce Dunn (1981) studied this question.
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