Abstract:

Nanocrystalline titania was prepared directly from industrial titanium hydroxide by NH₄NO₃ decomposition at 573K. DTA-TG, XRD, TEM and BET were employed to character the sample.The DTA-TG curves were measured by differential thermal balance to detect the phase transformation temperature of samples. Using α-Al₂O₃ as the standard substance. XRD was used to determine the phase composition of titania powders on a diffractometer (RIGUKU, Cu K_α=0.15406 nm, 40 kV). Crystallite sizes were determined from line broadening measurements by using Scherrer formula. TEM image of sample was obtained on a Phillips EM420 microscope, operating at l00kV and the special surface and pore volume are examined by BET method.