Method for producing barium titanate powder

• US 6,352,681 B1
• Filed: 12/29/1999
• Issued: 03/05/2002
• Est. Priority Date: 05/20/1998
• Status: Expired due to Fees

• Current Assignee: TOHO Titanium Company Limited (ENEOS Holdings, Inc.)
• Original Assignee: TOHO Titanium Company Limited (ENEOS Holdings, Inc.)
• Inventors: Horikawa, Matsuhide, Sakai, Hideki, Kagohashi, Wataru
• Primary Examiner(s): BOS, STEVEN J
• Application Number:
  US09/446,826
• Time in Patent Office: 797 Days
• Field of Search: 423/598, 501/137
• US Class Current: 423/598
• CPC Class Codes: C01G 23/006 Alkaline earth titanates
• CPC Class Codes: C01P 2002/34 perovskite-type (ABO3)
• CPC Class Codes: C01P 2004/32 Spheres
• CPC Class Codes: C01P 2004/52 highly monodisperse size distribution
• CPC Class Codes: C01P 2004/62 Submicrometer sized, i.e. from 0.1-1 micrometer

Abstract

A process for production of a barium titanate powder, the process comprises adding an aqueous solution of a titanium compound and an aqueous solution of a barium compound and an alkali metal hydroxide into an alkaline solution under stirring, thereby contacting the aqueous solutions with each other while controlling the molar ratio of the titanium compound to the barium compound to be within the range of 0.8 to 1.2.

Claims

1. A process for production of a barium titanate powder, the process comprising adding 1) a first aqueous solution of a titanium compound selected from the group consisting of halides, hydroxide, nitrate, sulfate, acetate, perchlorate and oxalate, and 2) a second aqueous solution of a barium compound and an alkali metal hydroxide into an alkaline aqueous solution under stirring, thereby contacting the first and second aqueous solutions with each other in the alkaline solution, while controlling the molar ratio of the titanium compound to the barium compound to be within the range of 0.8 to 1.2.

2. A process for production of a barium titanate powder according to claim 1, wherein the barium compound is at least one compound selected from the group consisting of halides, hydroxide, nitrate, sulfate, acetate, perchlorate, oxalate and alkoxides.

3. A process for production of a barium titanate powder according to claim 1, wherein the titanium compound is a titanium halide.

4. A process for production of a barium titanate powder according to claim 1, wherein the titanium compound is titanium tetrachloride.

5. A process for production of a barium titanate powder according to claim 1, wherein the barium compound is at least one of barium chloride and barium hydroxide.