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The equilibrium between water vapour, protons, and oxygen vacancies in rare earth oxides

✍ Scribed by Yngve Larring; Truls Norby

Publisher: Elsevier Science
Year: 1997
Tongue: English
Weight: 550 KB
Volume: 97
Category: Article
ISSN: 0167-2738
DOI: 10.1016/s0167-2738(97)00086-6

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✦ Synopsis

The electrical conductivity of Nd O and Sm O doped with 1 and 2 mol % CaO respectively, and LaGdO doped with 5 2 3 2 3 3 mol % BaO has been measured as a function of p(O ), p(H O) and temperature. Computer fitting of the data to a simple 2 2

model allows determination of entropy and enthalpy terms for the defect equilibrium between water vapour, oxygen vacancies and protons, together with the pre-exponential term and the activation enthalpy of the charge carrier mobilities. The entropies and enthalpies for these and other rare earth sesquioxides are compared to those of perovskites.

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