Ln(Pr, Nd, Gd, Yb, and Y) manganite cathode materials for SOFC applications

Book · Sun Dec 31 04:00:00 EST 1995

OSTI ID:242499

Wen, T L ^[1]; Sammes, N ^[2]; Yamamoto, O ^[3]

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1. Chinese Academy of Sciences, Shanghai (China). Shanghai Inst. of Ceramics
2. Univ. of Waikato, Hamilton (New Zealand). Centre for Technology
3. 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
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