Journal
SOLID OXIDE FUEL CELLS 12 (SOFC XII)
Volume 35, Issue 1, Pages 2077-2084Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1.3570198
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Funding
- EC FP7 NASA-OTM project
- DoE [DE-AC02-05CH11231]
- National Science Foundation (NSF)
- Battelle Energy Alliance, LLC (DoE) [DE-AC07-05ID14517]
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The structural disorder and lattice stability of complex perovskite (Ba,Sr)(Co,Fe)O-3, a promising cathode material for solid oxide fuel cells and oxygen permeation membranes, is explored by means of first principles DFT calculations. It is predicted that Ba and Sr ions easily exchange their lattice positions (A-cation disorder) similarly to Co and Fe ions (B-cation disorder). The cation antisite defects (exchange of A-and B-type cations) have a relatively high formation energy. The BSCF is predicted to exist in an equilibrium mixture of several phases and can decompose exothermically into the Ba- and Co-rich hexagonal (Ba,Sr)CoO3 and Sr- and Fe-rich cubic (Ba,Sr)FeO3 perovskites.
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