Process for the preparation of double metal oxide powders contai

Details Process for the preparation of double metal oxide powders contai Process for the preparation of double metal oxide powders contai

1991-06-10

1993-03-23

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Titanate, zirconate, stannate, niobate, or tantalate or...

423593, 423598, 423600, 501153, C04B 3546

Patent

active

051963884

ABSTRACT:
Disclosed is a process for the preparation of double metal oxide ceramic powders which contain at least one metal of Group IIIA, inclusive of aluminum and gallium, and at least one metal of Group IVB, inclusive of titanium and zirconium. The process involves a first step in which an aqueous solution of mixed metal alkoxides or salts is formed and which also contains a chelating agent, preferably a polycarboxylic acid, and a second step in which a base is added in order to cause precipitation of a mixed metal hydroxyl groups-containing precursor that can be calcined or otherwise converted to the final mixed metal oxide. The invention also pertains to novel double metal hydroxyl carboxylates which are useful intermediates in preparing double metal oxides.

REFERENCES:
patent: 3825653 (1964-07-01), Duerkson et al.
patent: 4266978 (1981-05-01), Prochazka
patent: 4661282 (1987-04-01), Clark
patent: 4946810 (1991-08-01), Heistand, II et al.
patent: 5039636 (1991-08-01), Lukacs, III
patent: 5849371 (1991-09-01), Rinn et al.
P. A. Brugger et al., Journal of Materials Science 21 (1986( 4431-4435.

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