Abstract
The electrical properties of were studied as a function of both oxygen partial pressure and water vapor partial pressure in the temperature range of 500-800°C, and the partial conductivities of protons, holes, and oxygen vacancies were calculated from the proposed defect model. P-type conduction was dominant in an oxidative atmosphere. It was shown that, in a wet atmosphere, is a mixed conductor of protons, holes, and oxygen ions. A conduction transition from protons to holes and/or oxygen ions was found as temperature increased. The calculated activation energy of oxygen ion transport was 0.67 eV; standard solution enthalpy of water dissolution was −164 kJ/mole, which is larger than that of The effect of dopants on the conduction mechanism is explained by a hopping mechanism. © 2003 The Electrochemical Society. All rights reserved.
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