Journal
MATERIALS LETTERS
Volume 213, Issue -, Pages 58-61Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2017.11.013
Keywords
Ferrite; Perovskite; Mixed conductor; Thermodynamics; Equilibrium constant
Funding
- Russian Science Foundation [17-79-30071]
- Russian Science Foundation [17-79-30071] Funding Source: Russian Science Foundation
Ask authors/readers for more resources
High level of mixed-conductivity and good stability of oxide La0.5Sr0.5FeO3-delta make it promising for the development of functional materials for such energy-related applications as solid oxide fuel cells and membrane reactors for partial oxidation of methane. The oxygen content in La0.49Sr0.5-xBaxFeO3-delta (x = 0, 0.25, 0.5) was measured by means of coulometric titration in the interval of partial oxygen pressure between 10(-20) and 0.5 atm at temperatures 750-950 degrees C. The obtained results were employed for defect structure analysis of oxides. An ideal solution model enabled satisfactory simulation of experimental data for barium-free oxide. A reasonable data description for barium-containing oxides was achieved in the model, assuming that some of the oxygen vacancies are unavailable for oxygen ions. Partial substitution of barium for strontium was found to decrease the oxidation reaction constant of iron ions, resulting in a raised concentration of n-type electronic charge carriers and a reduced concentration of p-type carriers. (C) 2017 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available