Method for production of dielectric powder

Claim 1

A method for the production of a dielectric powder consisting of a solid solution of compounds selected at least one each from the two groups (a) and (b) of compounds indicated below: (a) Compounds of the ABO 3 pervoskite structure and (b) Compounds of the A'(B' 1/2 B" 1/2 )O 3 , A'(B' 1/3 B" 2/3 ) O 3 , or A'(B' 2/3 B" 1/3 )O 3 valency-compensating pervoskite structure, wherein A and A' each denotes a divalent metal, B a tetravalent metal, B' a divalent metal or a trivalent metal, and B" a pentavalent metal or a hexavalent metal, said dielectric powders having a chemical composition represented by the following general formula: [ABO.sub.3 ].sub.1-x [A'(B'.sub.1-y B".sub.y)O.sub.3 ].sub.x (I) wherein x and y satisfy 0<x<1 and 0<y<1 respectively said method comprising dissolving and mixing metal alkoxides having a purity of at 99.9 mol% in at least one organic solvent in proportion such that proportions of the metallic elements of the metal alkoxides conform to the proportions of the metallic elements in said general formula (I); adding water or steam at a temperature of 0°-200° C. mixture to the solution thereby to hydrolyze the metal alkoxides whereupon the hydrolyzed mixture of metal alkoxides precipitates; and separating the precipitate from the liquid and drying the precipitate to obtain said dielectric powder.

Claim 2

A method for the production of a dielectric powder consisting of a solid solution of compounds selected at least one each from the two groups (a) and (b) of compounds indicated below: (a) Compounds of the ABO 3 pervoskite structure and (b) Compounds of the A'(B' 1/2 B" 1/2 )O 3 , A'(B' 1/3 B" 2/3 ) O 3 , or A'(B' 2/3 B" 1/3 )O 3 valency-compensating pervoskite structure, wherein A and A' each denotes a divalent metal, B a tetravalent metal, B' a divalent metal or a trivalent metal, and B" a pentavalent metal or a hexavalent metal, said dielectric powders having a chemical composition represented by the following general formula: [ABO.sub.3 ].sub.1-x [A'(B'.sub.1-y B".sub.y)O.sub.3 ].sub.x (I) wherein x and y satisfy 0<x<1 and 0<y<1 respectively said method comprising dissolving and mixing metal alkoxides having a purity of at 99.9 mol% in at least one organic solvent in proportion such that proportions of the metallic elements of the metal alkoxides conform to the proportions of the metallic elements in said general formula (I); adding water or steam at a temperature of 0°-200° C. mixture to the solution thereby to hydrolyze the metal alkoxides whereupon the hydrolyzed mixture of metal alkoxides precipitates; and separating the precipitate from the liquid and drying the precipitate to obtain said dielectric powder.