Complex metal oxide powder and method for the production of the same
AssigneeSumitomo Chemical Company, Limited
InventorsMasahide Mohri, Hironobu Koike, Tetsu Umeda
Life of this patent
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Abstract
A complex metal oxide powder having at least two metal elements, which contains polyhedral particles each having at least 6 planes, a number average particle size of from 0.1 to 500 .mu.m, and a D.sub.90 /D.sub.10 ratio of 10 or less in which D.sub.10 and D.sub.90 are particle sizes at 10% and 90% accumulation, respectively from the smallest particle size side in a cumulative particle size curve of the particles, and an yttrium-aluminum garnet powder containing polyhedral particles each having at least 6 planes, and a number average particle size of 20 to 500 .mu.m. These complex metal oxides contain less agglomerated particles, and have a narrow particle size distribution and a uniform particle shape.
Claims23
A method for producing a complex metal oxide powder comprising at least two metal elements, which method comprises calcining a mixture of at least two metal oxide powders and/or metal oxide precursor powders, or a metal oxide precursor powder comprising at least two metal elements in an atmosphere containing at least one gas selected from the group consisting of:
- (1) a hydrogen halide,
- (2) a component prepared from a molecular halogen and steam and
- (3) a molecular halogen.
Dependencies are inferred from the claim text.