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Title: Relationship of crystal structure, lattice parameters and thermal expansion to nonstoichiometry in La{sub 1{minus}x}MnO{sub 3+d} and La{sub 1{minus}x}Sr{sub x}MnO{sub 3+d} determined by high-temperature X-ray diffraction under controlled oxygen partial pressures

Abstract

To elucidate the phase change and volume variation of SOFC cathode materials, La{sub 1{minus}y}MnO{sub 3+d} (y = 0, 0.05) and La{sub 1{minus}x}Sr{sub x}MnO{sub 3+d}, with temperature and oxygen nonstoichiometry, high temperature X-ray diffraction analysis was made in the atmosphere of the controlled oxygen partial pressure. The structure above 800 C was found to be rhombohedral R{bar 3}C for the composition with x = 0 and 0.1, irrespective of the oxygen content. Both the lattice volume and thermal expansion coefficient increase with decreasing the oxygen content. For x{>=}0.3, the structure above 800 C was essentially cubic. The variation in the lattice parameter with P(O{sub 2}) at P(O{sub 2}) > 10{sup {minus}4} atm became smaller with the increase in Sr content, x, due to the smaller oxygen excess nonstoichiometry for the larger x in La{sub 1{minus}x}Sr{sub x}MnO{sub 3+d}.

Authors:
 [1]; ; ;  [2];  [3];  [4]
  1. Tohoku Univ., Sendai (Japan). Research Inst. for Scientific Measurements
  2. Yokohama National Univ. (Japan). Inst. of Environmental Science and Technology
  3. Kyocera Corp., Kagoshima (Japan). Central Research Lab.
  4. Univ. of Tokyo (Japan)
Publication Date:
OSTI Identifier:
242498
Report Number(s):
CONF-950683-
ISBN 1-56677-095-5; TRN: IM9626%%326
Resource Type:
Book
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
Subject:
36 MATERIALS SCIENCE; 30 DIRECT ENERGY CONVERSION; SOLID ELECTROLYTE FUEL CELLS; CATHODES; LANTHANUM OXIDES; CRYSTAL STRUCTURE; THERMAL EXPANSION; MANGANESE OXIDES; STRONTIUM OXIDES; CORRELATIONS; PHASE TRANSFORMATIONS; PARTIAL PRESSURE; OXYGEN; TEMPERATURE DEPENDENCE; EXPERIMENTAL DATA

Citation Formats

Mizusaki, Junichiro, Nambu, Hidetaka, Nakao, Chitose, Tagawa, Hiroaki, Minamiue, Hidehiro, and Hashimoto, Takuya. Relationship of crystal structure, lattice parameters and thermal expansion to nonstoichiometry in La{sub 1{minus}x}MnO{sub 3+d} and La{sub 1{minus}x}Sr{sub x}MnO{sub 3+d} determined by high-temperature X-ray diffraction under controlled oxygen partial pressures. United States: N. p., 1995. Web.
Mizusaki, Junichiro, Nambu, Hidetaka, Nakao, Chitose, Tagawa, Hiroaki, Minamiue, Hidehiro, & Hashimoto, Takuya. Relationship of crystal structure, lattice parameters and thermal expansion to nonstoichiometry in La{sub 1{minus}x}MnO{sub 3+d} and La{sub 1{minus}x}Sr{sub x}MnO{sub 3+d} determined by high-temperature X-ray diffraction under controlled oxygen partial pressures. United States.
Mizusaki, Junichiro, Nambu, Hidetaka, Nakao, Chitose, Tagawa, Hiroaki, Minamiue, Hidehiro, and Hashimoto, Takuya. Sun . "Relationship of crystal structure, lattice parameters and thermal expansion to nonstoichiometry in La{sub 1{minus}x}MnO{sub 3+d} and La{sub 1{minus}x}Sr{sub x}MnO{sub 3+d} determined by high-temperature X-ray diffraction under controlled oxygen partial pressures". United States.
@article{osti_242498,
title = {Relationship of crystal structure, lattice parameters and thermal expansion to nonstoichiometry in La{sub 1{minus}x}MnO{sub 3+d} and La{sub 1{minus}x}Sr{sub x}MnO{sub 3+d} determined by high-temperature X-ray diffraction under controlled oxygen partial pressures},
author = {Mizusaki, Junichiro and Nambu, Hidetaka and Nakao, Chitose and Tagawa, Hiroaki and Minamiue, Hidehiro and Hashimoto, Takuya},
abstractNote = {To elucidate the phase change and volume variation of SOFC cathode materials, La{sub 1{minus}y}MnO{sub 3+d} (y = 0, 0.05) and La{sub 1{minus}x}Sr{sub x}MnO{sub 3+d}, with temperature and oxygen nonstoichiometry, high temperature X-ray diffraction analysis was made in the atmosphere of the controlled oxygen partial pressure. The structure above 800 C was found to be rhombohedral R{bar 3}C for the composition with x = 0 and 0.1, irrespective of the oxygen content. Both the lattice volume and thermal expansion coefficient increase with decreasing the oxygen content. For x{>=}0.3, the structure above 800 C was essentially cubic. The variation in the lattice parameter with P(O{sub 2}) at P(O{sub 2}) > 10{sup {minus}4} atm became smaller with the increase in Sr content, x, due to the smaller oxygen excess nonstoichiometry for the larger x in La{sub 1{minus}x}Sr{sub x}MnO{sub 3+d}.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1995},
month = {12}
}

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