Process for preparation of indium oxide-tin oxide powder

Details Process for preparation of indium oxide-tin oxide powder Process for preparation of indium oxide-tin oxide powder

1993-12-07

1995-05-23

Gorgos, Kathryn

Chemistry: electrical and wave energy

Processes and products

C25B 100

Patent

active

054178169

ABSTRACT:
An indium oxide-tin oxide powder for ITO display devices etc. with only slight variance in properties such as average particle diameter and apparent density is prepared stably with good controllability and at low cost: (1) by electrolyzing indium as an anode, calcining or roasting the indium hydroxide obtained and combining the resulting indium oxide powder with a tin oxide powder; (2) by electrolyzing tin as an anode, calcining or roasting the metastannic acid obtained and combining the resulting tin oxide powder with an indium oxide powder; (3) by simultaneously electrolyzing indium and tin as separate anodes and then calcining or roasting the resulting mixed precipitate of indium hydroxide and metastannic acid to produce an indium oxide-tin oxide powder; or (4) by electrolyzing an alloy of indium and tin as an anode and then calcining or roasting the resulting precipitate of indium hydroxide and metastannic acid to produce an indium oxide-tin oxide powder.

REFERENCES:
patent: 4882014 (1989-11-01), Coyle et al.
patent: 5071800 (1991-12-01), Iwamoto et al.
patent: 5094787 (1992-03-01), Nakajima et al.
patent: 5116468 (1992-05-01), Giersberg et al.
S. B. Saidman, et al., "Stationary and non-stationary Electrochemical Response of Polycrystalline Indium in Alkaline Media", Electrochimica Acta vol. 35 No. 2 pp. 329-338 (1990).

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