Chemistry of inorganic compounds – Rare earth compound
Reexamination Certificate
2008-05-06
2008-05-06
Langel, Wayne A. (Department: 1793)
Chemistry of inorganic compounds
Rare earth compound
C423S593100, C423S594100, C423S594200, C423S594300, C423S594400, C423S594500, C423S594600, C423S599000, C423S600000, C429S218100, C429S221000, C429S223000, C429S224000, C429S231600, C429S304000, C429S319000
Reexamination Certificate
active
07368095
ABSTRACT:
The present invention provides a composite oxide for a high performance solid oxide fuel cell which can be fired at a relatively low temperature, and which has little heterogeneous phases of impurities other than the desired composition. The composite oxide is the one having a perovskite type crystal structure containing rare earth elements, and having constituent elements homogeneously dispersed therein. A homogeneous composite oxide having an abundance ratio of heterogeneous phases of at most 0.3% by average area ratio, and a melting point of at least 1470° C., is obtained by using metal carbonates, oxides or hydroxides, and reacting them with citric acid in an aqueous system.
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Fujie Yoshinori
Furuya Kenji
Hatano Masaharu
Munakata Fumio
Suhara Manabu
Fiorito James
Langel Wayne A.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Seimi Chemical Co. Ltd.
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