Method for producing coprecipitated multicomponent oxide powder precursors using guanidine oxalate as precipitating agent

• US 5,252,314 A
• Filed: 11/30/1990
• Issued: 10/12/1993
• Est. Priority Date: 11/30/1990
• Status: Expired due to Fees

• Current Assignee: Case Western Reserve University
• Original Assignee: Case Western Reserve University
• Inventors: Philipp, Warren H., DeGuire, Mark R.
• Primary Examiner(s): Lieberman, Paul
• Assistant Examiner(s): Swope, Bradley A.
• Application Number:
  US07/620,019
• Time in Patent Office: 1,047 Days
• Field of Search: 252/518, 505/1, 505/734, 505/738, 501/1, 501/123, 423/593
• US Class Current: 505/510
• CPC Class Codes: C01B 13/185 Preparing mixtures of oxides
• CPC Class Codes: C01G 29/006 Compounds containing, besides bismuth, two or more other elements, with the exception of oxygen or hydrogen
• CPC Class Codes: C01G 3/006 Compounds containing, besides copper, two or more other elements, with the exception of oxygen or hydrogen
• CPC Class Codes: C01G 49/009 Compounds containing, besides iron, two or more other elements, with the exception of oxygen or hydrogen
• CPC Class Codes: C01P 2006/80 Compositional purity
• CPC Class Codes: Y10S 505/734 From organometallic precursors, e.g. acetylacetonates
• CPC Class Codes: Y10S 505/738 by precipitating

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.

Claims

1. A method for producing an intimate mixture of metal oxide powder suited for preparation of ceramics, comprising the steps of:

synthesizing guanidine oxalate;

providing a guanidine oxalate solution comprising stoichiometric guanidine oxalate, water, and a water soluble alcohol having 1-3 carbon atoms per molecule;

mixing the guanidine oxalate solution with a solution of at least two types of soluble metal salts to produce a resultant solution having a temperature less than approximately 5°

C.;

reacting the guanidine oxalate with the soluble metal salts, resulting in a produce consisting essentially of quantitatively coprecipitated metal oxalates having a uniform composition; and

heating the coprecipitated metal oxalates to produce an intimate mixture of multicomponent metal oxide powder.

2. A method for producing an intimate mixture of metal oxide powder suited for preparation of ceramics, according to claim 1, wherein the soluble metal salts include oxidizing anions.

3. A method for producing an intimate mixture of metal oxide powder suited for preparation of ceramics, according to claim 1, wherein the temperature of the resultant solution is above its freezing point.