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Journal of Nanomaterials
Volume 2010, Article ID 626978, 5 pages
http://dx.doi.org/10.1155/2010/626978
Research Article

Study on the Phase Transformation Kinetics of Sol-Gel Drived Nanoparticles

1Department of Material Science and Engineering, Sharif University of Technology, Tehran 11155-9466, Iran
2Solid State Lasers Research Group, Laser & Optics Research School, NSTRI, Tehran 11365-8486, Iran

Received 11 December 2009; Accepted 13 August 2010

Academic Editor: Jun Liu

Copyright © 2010 H. Mehranpour et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Titanium dioxide nanopowders were synthesized by the diffusion controlled sol-gel process (LaMer model) and characterized by DTA-TG, XRD, and SEM. The prepared nanoparticles have uniform size and morphology, and the phase transformation kinetics of obtained material was studied by interpretation of the X-ray diffraction patterns peaks on the base of Avrami equation. The stating point of anatase-rutile phase transformation temperature in the prepared nanoparticles was found between 100 and . A decreasing trend on the intensity of X-ray peaks of anatase phase was observed up to when the presence of the rutile phase became predominant. Results indicated that the transition kinetics of the diffusion controlled prepared nanoparticles was begun at low temperature, and it can be concluded that the nucleation and growth sites in these particles were more than other. However, it has been found that the nucleation activation energy of rutile phase was 20 kj/mol, and it is the lowest reported activation energy.