Journal
RUSSIAN JOURNAL OF ELECTROCHEMISTRY
Volume 53, Issue 7, Pages 761-768Publisher
PLEIADES PUBLISHING INC
DOI: 10.1134/S1023193517070023
Keywords
perovskite; oxoanion doping; protonic conductivity; chemical stability
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Funding
- Russian Foundation for Basic Research [16-33-00323 mol_a]
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Conductivity of perovskite phosphate-substituted solid solutions of Ba4Ca2Nb2 P-x O-x(11) (0.0 <= x <= 0.5) was studied as a function of temperature, partial pressure of oxygen and water vapors. It is proved that the studied systems are protonic conductors at the temperatures below 600 degrees C in the atmosphere with elevated content of water vapors (pH(2)O = 1.92 x 10(-2) atm). Introduction of the tetrahedral [PO4] group in the complex oxide matrix of Ba4Ca2Nb2O11 results in an increase in the oxygen-ionic (dry air, pH(2)O = 1.91 x 10(-4) atm) and protonic conductivities (wet air, pH(2)O = 1.92 x 10(-2) atm). Is it found that the doping causes a considerable increase in chemical stability of phases with respect to carbon dioxide.
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