Patent Number: 7,820,138

Title: Indium oxide powder and method for producing same

Abstract: At least one basic precipitant selected from the group consisting of NaOH, KOH, NH.sub.4OH, NH.sub.3, NH.sub.4HCO.sub.3 and (NH.sub.4).sub.2CO.sub.3 is added to an indium salt solution, which contains 0.1 to 3 M of indium, in an adding time of not longer than 24 hours, while the solution is maintained at a temperature of 5 to 95.degree. C. until the equivalent of the basic precipitant reaches an equivalent of 0.5 to 3. Then, a precipitate obtained from the solution by a solid-liquid separation is dried and calcined at a temperature of 570 to 780.degree. C. in an non-oxidizing atmosphere which contains ammonia gas and water vapor.

Inventors: Watanabe; Makoto (Honjo, JP), Inamura; Tatsumi (Honjo, JP), Moteki; Yoshio (Honjo, JP)

Assignee: Dowa Mining Co., Ltd.

International Classification: C01G 15/00 (20060101); C01G 19/02 (20060101)

Expiration Date: 2018-10-26 0:00:00