Preparation and Characterization of Cr2O3 Nano-Powders by Sol-Gel Method
Cr2O3 nano-powders were successfully fabricated with using chromium nitrate and aqueous ammonia as starting material and urea as dispersant agent by sol-gel method. The formation of crystalline phase during heat treatment of dry gel was characterized by differential thermogravimetry (DTG) and X-ray diffraction (XRD) techniques and the temperature of calcination was determined as 400°C. Scanning electron microscopy (SEM) was utilized to observe the morphology of the as-fabricated Cr2O3 particles. The results showed that Cr2O3 particles are spherical or square with little agglomeration and a diameter of about 30 nm. The specific surface area of Cr2O3 particles was measured as 44.23 m2/g by Brunauer-Emmett-Teller (BET).
Yu Zhou, Shan-Tung Tu and Xishan Xie
C. C. Zhu et al., "Preparation and Characterization of Cr2O3 Nano-Powders by Sol-Gel Method", Key Engineering Materials, Vols. 353-358, pp. 2111-2114, 2007