Abstract: Nano-titania was prepared by Ti(OC₄Hg)₄ hydrolysis precipition approach, its particle sizeand agglomeration can be controlled by adjusting some parameters of the process. Reflect spectrarevealed that the series limit of nano-titania was influenced by its particle size and crystal structureas well. Titania compact with a grain size about 200um and 93.3% relative density was obtainedvia hot-pressure sintering.

Key words: nano-titania, reflect spectrum, series limit, hot-pressure sintering