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Chemical Interactions between La‐Sr‐Mn‐Fe‐O‐Based Perovskites and Yttria‐Stabilized Zirconia
Author(s) -
Kindermann Lutz,
Das Dasarathi,
Bahadur Dhirendra,
Wei Reinhard,
Nickel Hubertus,
Hilpert Klaus
Publication year - 1997
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1997.tb02921.x
Subject(s) - yttria stabilized zirconia , orthoferrite , materials science , cubic zirconia , monoclinic crystal system , solid solution , electrolyte , perovskite (structure) , oxide , mineralogy , inorganic chemistry , crystallography , crystal structure , ceramic , chemistry , metallurgy , physics , magnetization , electrode , quantum mechanics , magnetic field
Orthoferrite‐based perovskites are of interest as materials for the cathode in solid oxide fuel cells (SOFCs). Therefore, the chemical compatibility between perovskites of the composition (La 1−x Sr x ) z Fe 1−y Mn y O 3−δ (0 # x # 0.3; 0.2 # y # 1; z = 0.90, 0.95, 1.00) and the solid electrolyte zirconia (ZrO 2 ) doped with 8 mol% yttria (Y 2 O 3 ) (8YSZ) has been investigated. Powder mixtures of the two materials have been annealed at different temperatures. The formation of monoclinic ZrO 2 at 1000°C, as well as of La 2 Zr 2 O 7 and SrZrO 3 at 1400°C, has been determined in some samples. The reactions that are observed are discussed, with respect to the thermodynamic activities, tolerance factor, and oxygen‐ion migration energies. Some perovskite compositions seem to be compatible with Y 2 O 3 ‐stabilized ZrO 2 (YSZ), thereby offering the possibility to use orthoferrite‐based perovskites in SOFCs with a solid electrolyte made of YSZ.