期刊
RUSSIAN JOURNAL OF ELECTROCHEMISTRY
卷 45, 期 5, 页码 586-592出版社
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1134/S1023193509050176
关键词
double perovskite; Ba4Ca2Nb2O11; oxygen vacancies; water vapor pressure; protonic conductivity
The conductivity of the Ba4Ca2Nb2O11 phase and its solid solutions of the formulas Ba4.4Ca1.6Nb2O11 and Ba3.4Ca2.6Nb2O11 is studied as a function of the partial pressure of the water vapor at 2 x 10(-2)-3 x 10(-5) atm (log P-H2O = -1.7...-4.5) and temperatures of 400-600 degrees C. A model, which is based on the model of structural oxygen vacancies, is proposed for the quasichemical description, providing an adequate explanation of the experimental dependences log sigma(tot) = f(log P-H2O). It is shown that in the region dominated by the proton transport the log dependences of the conductivity on P-H2O have the slope of 1/3. Proton transport numbers are calculated at the given temperatures and pressures of the water vapor.
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