Process for the synthesis of crystalline powders of perovskite c

Details Process for the synthesis of crystalline powders of perovskite c Process for the synthesis of crystalline powders of perovskite c

1996-11-14

1999-05-04

Bos, Steven

Chemistry of inorganic compounds

Rare earth compound

423593, 423598, C01F 1700, C01F 1314, C01G 2300

Patent

active

059002239

ABSTRACT:
A process for the preparation of crystalline perovskite powders consisting essentially of primary particles uniform in nanometer or micrometer size and uniform and near spherical shape and of narrow size distribution, of the general formula A.sub.x (BO.sub.3).sub.y, wherein cation A is at least one metal selected from the group comprising Li.sup.+, Na.sup.+, K.sup.+, Mg.sup.2+, Ca.sup.2+, Sr.sup.2+, Ba.sup.2+ and La.sup.3+ and B in the anion (BO.sub.3) is at least one metal selected from the group consisting of Ti.sup.4+, Zr.sup.4+, Sn.sup.4+, Hf.sup.4+, Nb.sup.5+ and Ta.sup.5+, x is equal to the valence of the anion (BO.sub.3) and y is equal to the valence of cation (A), comprising contacting, under stirring, an aqueous solution (I) containing inorganic or organic salts or organometallic compounds of at least one metal A and of at least one metal B, the ratio (A)/(B) being around the stoichiometric value corresponding to the above general formula, with an aqueous basic solution (II) containing an inorganic or organic base in an amount at least above the stoichiometric amount corresponding to the above general formula, preheated to 70.degree.-100.degree. C., and performing the process at temperatures of from 70.degree. to 100.degree. C. while maintaining the reaction mixture at constant OH.sup.- concentration.

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