Effect of hydrolysis catalysts(HCl and C_(5)H_(8)O_(2))on structural evaluation of gelderived nanocrystalline TiO_(2) powders was studied.Crystallization temperature of the HCl catalyzed gel is about 200K lower than that of the C_(5)H_(8)O_(2) catalyzed one.But in the later gel the anatase phase transforms to rutile at a lower temperature,and the transformation is completed in a much more narrow temperature range.
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