The samples of nano-meter alumina of uniform partical diameter were prepared by an improved Sol-Gel method. The infrared spectra were measured in the same instrument conditions. The influence of the temperature, pH value of the precursor and dispersing agent on IR spectra of nano-meter alumina were studied. The results show that the change of the position and intensity of IR absorption are related to the preparing conditions and the grain size. Decrease in the particle diameter and increase in the atom number on the surface led to an intesified tendency for the spectra band intensity related to longitudinal phonon transfer of nano-meter alumina to increase.

Key words: ALUMINIUM OXIDE, NANOPHASE MATERIALS, INFRARED SPECTROPHOTOMETRY, SOL-GEL PROCESS, SPECIFIC SURFACE, PARTICLE DIAMETER