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J. Korean Ceram. Soc. > Volume 40(9); 2003 > Article
Journal of the Korean Ceramic Society 2003;40(9): 827.
doi: https://doi.org/10.4191/kcers.2003.40.9.827
On the Chemical Diffusion Coefficient of H2O in AB1-xBxO(3-x/2)-type Perobskites
Hyun-Deok Baek, Anil V. Virkar1
Department of Materials Science and Engineering, Hong-ik University
1Department of Materials Science and Engineering, 122S Central Campus drive University of Utah
ABSTRACT
In proton-conducting perovskites, oxygen ions and protons make a diffusion pair for a chemical diffusion and thus lead to the transport of $H_2O$ under its chemical potential gradient. The present manuscript develops relationships between the chemical diffusion coefficient of $H_2O$ and the diffusion coefficients of protons and oxygen vacancies with an emphasis on the thermodynamic behavior of the oxygen vacancies. Depending on the degree of hydration X, two different expressions of the chemical diffusion coefficient were obtained : equation omitted and equation omitted.
Key words: Chemical diffusion coefficient, Degree of hydration, Thermodynamic factor, Perovskite
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