Characterization of La-Doped TiO_2 Nanopowders by Raman Spectroscopy

• Authors: M. Šćepanović , S. Aškrabić , V. Berec , A. Golubović , Z. Dohčević-Mitrović , A. Kremenović , Z. Popović
• Languages of publication: EN

Abstracts

EN

Titanium dioxide (TiO_2) nanopowders doped with 0.65, 1, 2, 3 and 4 wt.% of lanthanum ions (La^{3+}) were synthesized by sol-gel technology. Dependence of structural and morphological characteristics of nanopowders on La^{3+} content and synthesis conditions is investigated by the Raman spectroscopy. Very intensive modes observed in the Raman spectra of all nanopowder samples are assigned to anatase phase of TiO_2. Additional Raman modes of extremely low intensity can be related to the presence of certain amount of highly disordered brookite phase in nanopowders. Dependence of the intensity ratio of the Raman modes which originate from anatase and brookite on doping conditions is specially analyzed. In order to estimate the variation of nanocrystallite size with dopant content, shift and asymmetrical broadening of the most intensive E_g Raman mode of anatase are analyzed by phonon confinement model. The obtained results are compared with the results of X-ray diffraction spectroscopy. Special attention is dedicated to the changes in the Raman spectra of pure and La-doped TiO_2 nanopowders observed after high temperature treatment.

Keywords

EN

81.20.Fw; 81.07.Wx; 78.30.-j; 07.05.Tp

Discipline

• 81.07.Wx: Nanopowders
• 81.20.Fw: Sol-gel processing, precipitation(for reactions in sol-gels, see 82.33.Ln; for sol-gels as disperse system, see 82.70.Gg)
• 78.30.-j: Infrared and Raman spectra(for vibrational states in crystals and disordered systems, see 63.20.-e and 63.50.-x, respectively; for Raman spectra of superconductors, see 74.25.nd)
• 07.05.Tp: Computer modeling and simulation

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2009
• Volume: 115
• Issue: 4
• Pages: 771-774

Dates

published

2009-04

Contributors

author

M. Šćepanović

• Center for Solid State Physics and New Materials, Institute of Physics, Pregrevica 118, 11080 Belgrade, Serbia

author

S. Aškrabić

• Center for Solid State Physics and New Materials, Institute of Physics, Pregrevica 118, 11080 Belgrade, Serbia

author

V. Berec

• Center for Solid State Physics and New Materials, Institute of Physics, Pregrevica 118, 11080 Belgrade, Serbia

author

A. Golubović

• Center for Solid State Physics and New Materials, Institute of Physics, Pregrevica 118, 11080 Belgrade, Serbia

author

Z. Dohčević-Mitrović

• Center for Solid State Physics and New Materials, Institute of Physics, Pregrevica 118, 11080 Belgrade, Serbia

author

A. Kremenović

• Faculty of Mining and Geology, Laboratory for Crystallography, University of Belgrade, Djušina 7, 11000 Belgrade, Serbia

author

Z. Popović

• Center for Solid State Physics and New Materials, Institute of Physics, Pregrevica 118, 11080 Belgrade, Serbia

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Identifiers

DOI

10.12693/APhysPolA.115.771