金属アルコキシド溶液を用いる透光性TiO_2多結晶体の作製

概要

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Translucent and polycrystalline TiO_2 monolith was pre pared by heating a gel at 500℃. Clear Ti0_2 gel as a precursor was formed through the controlled hydroly sis of a Ti n butoxide/cyclohexane solution ill a vessel covered with a plastic film having pin holes. Upon heat ing, the amorphous gel crystallized to anatase at 200℃ and converted into rutile at 600℃. In the temperature range from room temperature to 600℃, a large volume change which may cause a crack in the gel occurred with decomposition of residual organic materials. Transparency of the gel was retained up to 550℃ ex cept in the decomposition temperature range of organ ic materials (160 330℃). The TiO_2 monolith obtained from a crak free gel after heating to 500℃ at a rate of 20℃/h was a translucent porous material (apparent porosity : 42% and pore diameter : 7-30 nm) and con sisted of fine anatase grains.
社団法人日本セラミックス協会の論文
1994-06-01