Composite oxide for solid oxide fuel cell and method for...

Chemistry of inorganic compounds – Rare earth compound

Reexamination Certificate

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C423S593100, C423S594100, C423S594200, C423S594300, C423S594400, C423S594500, C423S594600, C423S599000, C423S600000, C429S218100, C429S221000, C429S223000, C429S224000, C429S231600, C429S304000, C429S319000

Reexamination Certificate

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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.

REFERENCES:
patent: 6090500 (2000-07-01), Ishihara et al.
patent: 11-335164 (1999-12-01), None
patent: 2000-44340 (2000-02-01), None
patent: 2000-113898 (2000-04-01), None
patent: 2003-7309 (2003-01-01), None
patent: 95/05685 (1995-02-01), None
patent: 98/22392 (1998-05-01), None

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