In_2O_3微粉末の合成とその2段階焼結

概要

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Fine powders of In_2O_3 were obtained by thermal decomposition of the precipitates, which were prepared by an oxalate method in ethanol solution. The sinterability of the powders was improved considerably, compared with that of commercial powders. The maximum density reached 82% of the theoretical value by sintering at 1450℃. Furthermore, the relative density increased as high as 90.9% by a new two-step sintering process, which includes a presintering step at a relatively low temperature and a final sintering step at 1450℃ under atmospheric condition. The electrical resistivity of sintered In_2O_3 was strongly dependent on the relative density and increased in proportion to the measurement temperature, showing metallic conduction behavior. The temperature coefficient (α) in the linear relationship was ascribed to an electron scattering effect due to porosities. The residual resistivity (ρ_r) of 0.0038 Ω・cm, which was estimated by extrapolation to 0 K, agreed with the value reported for the single crystal grown from vapor phase.
社団法人日本セラミックス協会の論文
2001-12-01