Patent ID: 7897128
Filing Date: 2011-03-01
Classification: C01B,C01G,C01P

Abstract:
1. A process for making a complex metal oxide comprising the formula wherein the process comprising the steps of: (a) reacting in a solution at a temperature of between about 75° C. to about 100° C. at least one water-soluble salt of A, at least one water-soluble salt of B and a stoichiometric amount of a carbonate salt or bicarbonate salt required to form each mole of a carbonate precipitate represented by the formula wherein the reacting is conducted in a substantial absence of carbon dioxide to form the carbonate precipitate and wherein the molar amount of carbonate salt or bicarbonate salt is at least three times the stoichiometric amount of carbonate or bicarbonate salt required to form each mole of the carbonate precipitate, and wherein the carbonate salt or bicarbonate salt is selected from the group consisting of NaHCO 3 , KHCO 3 , CsHCO 3 , Na 2 CO 3 , and K 2 CO 3 ; and (b) reacting the carbonate precipitate with an oxygen containing gas at a temperature of from between about 650° C. to about 1,200° C. to form the complex metal oxide.