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 (<TEX>$35m^2/g$</TEX>), 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, <TEX>$20nm{\times}80nm$</TEX>, and it possesses a higher BET value <TEX>$(57m^{2}/g)$</TEX> compared to the plain coprecipitated material <TEX>$(35m^{2}/g)$</TEX>. 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 <TEX>$1500^{\circ}C$</TEX> for the recrystallized powders while densities of the coprecipitated powders were below 75%.
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