Abstract

The first detailed conductivity measurements on single crystals of H 3O + beta alumina are discussed in this paper. The conductivity of single crystal H 3O + beta alumina at 20°C is 10 −11 (ohm cm) −1. From 20 to about 200°C it increases in an Arrhenius relationship with an activation energy of 18 kcal/mole. Between 200 and 300°C H 3O + beta alumina undergoes a partial and reversible dehydration in which approximately 50% of its H 3O + content is converted to H +. The resulting composition, H +H 3O + beta alumina has a much lower conductivity at 300° than H 3O + beta alumina. H +H 3O + beta alumina has a conductivity of 10 −6 (ohm cm) −1 at 500°C, which varies between 300 and 550° in an Arrhenius expression with an activation energy of 29 kcal/mole.

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