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US 5,298,654 AGranted
Method for producing coprecipitated multicomponent oxide powder precursors
AssigneeCase Western Reserve University
InventorsMark R. DeGuire, Warren H. Philipp
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Abstract
Guanidine oxalate is used as a precipitating agent in the coprecipitation of multicomponent oxide powder precursors. A solution of a soluble inorganic salt is combined with a solution of guanidine oxalate. A resultant metal oxalate is precipitated from the solution and can thereafter be subjected to heat to convert the metal oxalate into a multicomponent ceramic powder.
Claims11
A method for coprecipitating metal oxalate precursors for multicomponent metal oxide powders, comprising the steps of:
- synthesizing and isolating guanidine oxalate;
- purifying the isolated guanidine oxalate by recrystallization;
- dissolving purified guanidine oxalate in water at a temperature below about 25.degree. C. to provide a guanidine oxalate solution;
- mixing the guanidine oxalate solution with a solution comprising a soluble metal salt and water to form a resulting solution;
- and
- precipitating a metal oxalate from the resulting solution.
3 more elements
A method for precipitating multicomponent oxide precursors, comprising the steps of:
- synthesizing stoichiometric guanidine oxalate according to a process including a step of adding oxalic acid to a solution of guanidine carbonate;
- purifying the stoichiometric guanidine oxalate;
- adding the purified guanidine oxalate to a solution comprising water or water and alcohol to provide a guanidine oxalate solution;
- mixing the guanidine oxalate solution with an aqueous soluble metal salt solution to form a resultant solution having a temperature of less than about 25.degree. C.;
- precipitating a substantially homogeneous metal oxalate product from said resulting solution.
2 more elements
Dependencies are inferred from the claim text.