Indium oxide powder and method for producing same
AssigneeDowa Mining Co., Ltd.
InventorsMakoto Watanabe, Tatsumi Inamura, Yoshio Moteki
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Abstract
At least one basic precipitant selected from the group consisting of NaOH, KOH, NH4OH, NH3, NH4HCO3 and (NH4)2CO3 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° 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° C. in an non-oxidizing atmosphere which contains ammonia gas and water vapor.
Claims10
A method for producing an indium oxide powder, the method comprising the steps of:
- adding a basic precipitant to an indium salt solution to produce a precipitate;
- separating the precipitate by a solid-liquid separation;
- drying the separated precipitate;
- and
- calcining the dried precipitate in a non-oxidizing atmosphere.
An indium oxide powder having a mean particle diameter D50 of 0.05 to 0.7 micrometers, a maximum particle diameter Dmax of 0.05 to 1.2 micrometers, and a BET specific surface area of 7 to 18 m2/g, wherein a ratio of a compacted density of the indium oxide powder to a bulk density thereof is not less than 7.
Dependencies are inferred from the claim text.