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Research Letters in Materials Science
Volume 2007, Article ID 48962, 5 pages
http://dx.doi.org/10.1155/2007/48962
Research Letter

Synthesis and Characterization of Ceramic Nanoparticles System Based on Anatase-Doped Hematite

1Physics Department, Bayer Center, Duquesne University, Pittsburgh, PA 15282-0321, USA
2Department of Materials Science, National Institute for Materials Physics, P.O. Box MG/7, Bucharest 77125, Romania

Received 18 October 2007; Accepted 12 December 2007

Academic Editor: Kevin Knowles

Copyright © 2007 Monica Sorescu 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

The xTiO2-(1x)α-Fe2O3 ceramic nanoparticles system has been obtained by mechanochemical activation for x = 0.1 and 0.5 and for ball milling times ranging from 2 to 12 hours. Structural and morphological characteristics of the anatase-doped hematite system were investigated by X-ray diffraction (XRD), Mössbauer spectroscopy, and transmission electron microscopy (TEM) combined with electron diffraction (ED). In the XRD patterns, we could evidence the dissolution of anatase in hematite, more pronounced for x = 0.1. The Rietveld structure of the XRD patterns yielded the dependence of the particle size and lattice constants on the amount x of Ti substitutions and as function of the ball milling time. For x = 0.1, we observed line broadening of the Mössbauer resonances and corresponding fit with several subspectra. For x = 0.5, it can be observed that the central doublet corresponding to superparamagnetic particles becomes more prominent. The ball milling route allowed us to reach nanometric particle dimensions, which would make the materials very promising for catalytic and gas sensing applications.