Sintering mechanisms and thermal expansion behavior for stoichiometric doped lanthanum chromites under reducing environment

Book · Sun Dec 31 00:00:00 EST 1995

OSTI ID:242546

Mori, Masashi; Yamamoto, Tohru; Itoh, Hibiki; Abe, Toshio ^[1]

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1. Central Research Inst. of Electric Power Industry, Yokosuka, Kanagawa (Japan). Chemical Energy Engineering Dept.

Sintering mechanisms and thermal expansion behavior of Mg, Ca or Sr doped LaCrO{sub 3} in a reducing environment have been investigated. In the case of Mg doped LaCrO{sub 3} under Ar-CO atmosphere, MgO particles are deposited in the grain-boundary during the sintering process, and then a solid state densification proceeds in the form of lanthanum chromite with a chromium deficit. For the Ca or Sr substitution, a liquid phase with a Ca or Sr-rich composition would percolate from the particles during the liquid phase sintering process. For all these materials, a difference of the thermal expansion coefficients between air and hydrogen was observed. Especially, after being measured in air, the thermal expansion slope showed a remarkable change during the first heating cycle under a hydrogen atmosphere. The temperatures were 465 C for the Ca-doped sample and 614 C for the Sr-doped one.

• OSTI ID: 242546
• Report Number(s): CONF-950683-; ISBN 1-56677-095-5; TRN: IM9626%%374
• Resource Relation: Conference: 4. international symposium on solid oxide fuel cells, Yokohama (Japan), 18-23 Jun 1995; Other Information: PBD: 1995; Related Information: Is Part Of Proceedings of the fourth international symposium on solid oxide fuel cells (SOFC-IV). Proceedings Volume 95-1; Dokiya, M. [ed.] [National Inst. of Materials and Chemical Research, Tsukuba, Ibaraki (Japan)]; Yamamoto, O. [ed.] [Mie Univ., Tsu, Mie (Japan)]; Tagawa, H. [ed.] [Yokohama National Univ., Yokohama, Kanagawa (Japan)]; Singhal, S.C. [ed.] [Westinghouse Electric Corp., Pittsburgh, PA (United States)]; PB: 1188 p.
• Country of Publication: United States
• Language: English

Related Subjects

30 DIRECT ENERGY CONVERSION
36 MATERIALS SCIENCE
SOLID ELECTROLYTE FUEL CELLS
BATTERY SEPARATORS
LANTHANUM OXIDES
SINTERING
THERMAL EXPANSION
CHROMIUM OXIDES
MAGNESIUM OXIDES
CALCIUM OXIDES
STRONTIUM OXIDES
DOPED MATERIALS
ARGON
CARBON MONOXIDE
OXYGEN
PARTIAL PRESSURE
PHASE STUDIES
EXPERIMENTAL DATA