Fabrication of low-porosity indium tin oxide ceramics in air from hydrothermally prepared powder

Compositionally homogeneous indium tin oxide (ITO) ceramics with low porosi ty were obtained successfully by sintering hydrothermally prepared powders. The fabrication technique began with the preparation of microcrystalline, homogeneously tin-doped (5 wt%) indium oxyhydroxide powder, under hydrother mal conditions. Low-temperature (similar to 500 degreesC) calcination of th e hydrothermally derived powder led to the formation of a substitutional-va cancy-type solid solution of In2Sn1-xO5-y, and further heating of this phas e at temperatures of >1000 degreesC resulted in the formation of the tin-do ped Indium oxide phase, which had the C-type rare-earth-oxide structure. Th e sintering of uniformly packed, calcined powder compacts at 1450 degreesC for 3 h in air resulted in low-porosity (similar to0.7%) ITO ceramics.