Indium tin oxide fine powder and method for preparing the same

Details Indium tin oxide fine powder and method for preparing the same Indium tin oxide fine powder and method for preparing the same

1998-10-26

2000-08-01

Griffin, Steven P.

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

423 92, 423115, 423593, 423624, C01G 1702

Patent

active

060962852

ABSTRACT:
Herein disclosed is 6 indium tin oxide (ITO) fine powder whose crystal form is a corundum type one and which has a true specific gravity of not less than 6.5 g/cc, a green density of not less than 3.0 g/cc, and a Seebeck coefficient of less than 30 .mu.V/cc at ordinary temperature and less than 80 .mu.V/cc after heating at 200.degree. C. The ITO fine powder can be prepared by a method which comprises the steps of neutralizing an aqueous solution containing an indium salt and a tin salt with ammonia to thus control the pH of the reaction solution to the range of from 6.8 to 7.5; separating the resulting neutralized precipitates through filtration; drying and washing the precipitates; calcining the precipitates in the air at a temperature ranging from 550 to 700.degree. C.; and then reducing-burning at a temperature ranging from 350 to 450.degree. C. in a reducing atmosphere.

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