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http://dx.doi.org/10.4150/KPMI.2004.11.6.467

Preparation of Nano-sized Indium Tin Oxide (ITO) Powders and Their Sintering Behavior  

Lee In-Gyu (Department of Materials Engineering, Hankuk Aviation University)
Heo Seung-Moo (Department of Materials Engineering, Hankuk Aviation University)
Publication Information
Journal of Powder Materials / v.11, no.6, 2004 , pp. 467-471 More about this Journal
Abstract
In order to fabricate a high density sintered body of ITO, nano-sized ITO powders were synthesized by coprecipitation methods. Aqueous solutions of indium and tin salts were mixed and coprecipitated by changing their pH. Coprecipitated ITO powders possessed 20-30 nm crystallite size and a relatively high BET value ($35m^2/g$), however, aggregation of particles were occurred. Therefore, a novel recrystallization technique was applied in order to eliminate the aggregates. The recrystallized ITO material consists of a little bit larger needlelike crystals, $20nm{\times}80nm$, and it possesses a higher BET value $(57m^{2}/g)$ compared to the plain coprecipitated material $(35m^{2}/g)$. Metastable phase formation and higher content of aggregated particles were observed in the coprecipitated materials. Densification was 95% to 98% complete after 5 hour sintering at $1500^{\circ}C$ for the recrystallized powders while densities of the coprecipitated powders were below 75%.
Keywords
Indium Tin Oxide; Coprecipitation; Sintering behavour; Recrystallization;
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