Oxygen tracer diffusion in polycrystalline calcium-doped lanthanum chromites
- Tokyo Gas Co., Ltd. (Japan). Fundamental Technology Research Lab.
Acceptor-doped lanthanum chromites have been considered as one of the most promising materials for interconnectors in solid-oxide fuel cells (SOFCs). Oxygen tracer diffusion in polycrystalline (La,Ca)CrO{sub 3{minus}{delta}} was studied by the gas-solid isotope exchange reaction in combination with a depth-profiling technique using secondary-ion mass spectroscopy, which allowed determination of coefficients of lattice and grain-boundary diffusion separately. A significant contribution of fast grain-boundary diffusion was confirmed. The lattice diffusion coefficient increased with increased acceptor content and decreased oxygen partial pressure, which was consistent with the currently established point defect model and, thereby, suggested that the lattice oxide ions diffused by a vacancy mechanism.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 605751
- Journal Information:
- Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 12 Vol. 80; ISSN 0002-7820; ISSN JACTAW
- Country of Publication:
- United States
- Language:
- English
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