Method for preparing cerium carbonate powder

Chemistry of inorganic compounds – Rare earth compound

Reexamination Certificate

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C423S419100, C051S309000

Reexamination Certificate

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07976810

ABSTRACT:
In a method for preparing cerium carbonate powder by mixing a cerium precursor solution with a carbonate precursor solution and carrying out a precipitation reaction, wherein cerium carbonate is controlled to have an orthorhombic crystal structure, a hexagonal crystal structure or an orthorhombic/hexagonal mixed crystal structure, by using at least one type of organic solvent comprising at least two hydroxyl groups (OH) in molecular formula as a solvent for either or both the cerium precursor solution and the carbonate precursor solution, and varying a number of carbons or hydroxyl groups (OH) included in the molecular formula of the organic solvent. The method can easily and inexpensively obtain cerium carbonate powder with a desired crystal structure without the danger by high-temperature high-pressure and the need for an expensive system in hydrothermal synthesis.

REFERENCES:
patent: 5879715 (1999-03-01), Higgins et al.
patent: 2008/0132403 (2008-06-01), Nho et al.
patent: 07-144915 (1995-06-01), None
patent: 07-172826 (1995-07-01), None
patent: 2000-159521 (2000-06-01), None
patent: 10-2000-0069823 (2000-11-01), None
patent: 10-2003-0093193 (2003-12-01), None

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