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Advances in Materials Science and Engineering
Volume 2009, Article ID 502437, 4 pages
Research Article

Structural and Raman Vibrational Studies of - Oxide System

1Laboratoire Matériaux et Environnement LME, Faculté des Sciences, Université Ibn Zohr, BP 8106, Cité Dakhla, 80000 Agadir, Morocco
2Institut Matériaux Microélectronique et Nanosciences de Provence, IM2NP, UMR CNRS 6242, Université du Sud Toulon-Var, BP 20132, 83957 La Garde Cedex, France

Received 10 August 2009; Accepted 1 November 2009

Academic Editor: Peter Majewski

Copyright © 2009 L. Bourja 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.


A series of ceramics samples belonging to the - phase system have been prepared via a coprecipitation route. The crystallized phases were obtained by heating the solid precursors at for 6 hours, then quenching the samples. X-ray diffraction analyses show that for a solid solution with fluorine structure is formed. For x ranging between 0.25 and 0.7, a tetragonal phase coexisting with the FCC solid solution is observed. For x ranging between 0.8 and 0.9, a new tetragonal phase appears. The phase is postulated to be a superstructure of the phase. Finally, close to , the classical monoclinic structure is observed. Raman spectroscopy confirms the existence of the phase changes as x varies between 0 and 1.