Ln(Pr, Nd, Gd, Yb, and Y) manganite cathode materials for SOFC applications
- Chinese Academy of Sciences, Shanghai (China). Shanghai Inst. of Ceramics
- Univ. of Waikato, Hamilton (New Zealand). Centre for Technology
- Mie Univ., Tsu, Mie (Japan)
The ternary oxide system, Ln{sub 1{minus}x}Sr{sub x}MnO{sub 3} (Ln = Pr, Nd, Sm, Gd, Yb and Y, with x {<=} 0.5), was synthesized by means of solid reaction at 1,400 C. The phase composition and structure type of the reaction products were analyzed by X-ray powder diffraction measurement. When Ln = Pr, Nd, Sm, or Gd, which have ionic radii greater than 1.0{angstrom}, Ln{sub 1{minus}x}Sr{sub x}MnO{sub 3} exhibits an orthorhombic-perovskite structure of LaMnO{sub 3}. When Ln = Yb or Y, which have ionic radii smaller than 0.95{angstrom}, the reaction products consist of (Yb,Y)MnO{sub 3} with a hexagonal structure and a second phase of Sr(Yb,Y){sub 2}O{sub 4}. The electrical conductivities of the sintered samples were determined by a standard four probe technique. It was found that the conductivities of (Pr,Nd,Sm){sub 1{minus}x}Sr{sub x}MnO{sub 3} are approximately one order of magnitude higher than La{sub 1{minus}x}Sr{sub x}MnO{sub 3} at high temperatures, and fully dense films, composed of the materials, were formed on a YSZ ceramic substrate by an appropriate procedure.
- OSTI ID:
- 242499
- Report Number(s):
- CONF-950683--; ISBN 1-56677-095-5
- Country of Publication:
- United States
- Language:
- English
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36 MATERIALS SCIENCE
CATHODES
COMPATIBILITY
ELECTRIC CONDUCTIVITY
EXPERIMENTAL DATA
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MANGANESE OXIDES
NEODYMIUM OXIDES
PHASE STUDIES
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SAMARIUM OXIDES
SOLID ELECTROLYTE FUEL CELLS
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