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Chromium oxides mixtures in PLD films investigated by Raman spectroscopy

O. MONNEREAU1, L. TORTET1, C. E. A. GRIGORESCU2,* , D. SAVASTRU2, C. R. IORDANESCU2, F. GUINNETON1, R. NOTONIER3, A. TONETTO3, T. ZHANG4, I.N. MIHAILESCU5, D. STANOI5, H.J. TRODAHL6

Affiliation

  1. Laboratoire Chimie Provence and 3 SCM, Universite de Provence, Marseille, France
  2. National Institute R&D Optoelectronics INOE 2000, P.O. Box MG-5, Str Atomistilor No 409, Magurele, Judet Ilfov, 77125, Romania
  3. SCM, Universite de Provence, Marseille, France
  4. Renishaw plc, Old Town, Wotton-under-Edge, Gloucestershire GL12 7DW United Kingdom
  5. NILPRP, Str Atomistilor No 409, Magurele, Judet Ilfov, 77125 Romania
  6. Victoria University, PO Box 600, Wellington, New Zealand

Abstract

The composition of Pulsed Laser Deposited thin films from Cr8O21 targets has been investigated by Raman spectroscopy. To this purpose we have prepared the chromium oxides Cr8O21, Cr2O5, CrO2 and Cr2O3 in bulk form to provide standard Raman spectra for characterisation of the samples. The range of oxides has been prepared by thermal decomposition of CrO3 following the thermo-gravimetric analysis. CrO2 was obtained by two other specific ways, i.e. hot pressing of Cr8O21 and hydrothermal synthesis. Structural characterization was performed by X-ray diffraction, SEM, IR and Raman spectroscopy. Raman investigation is demonstrated to have the capacity to identify CrO2 as well as trace concentrations of secondary phases in the PLD thin films. The Raman measurements have led us also to the conclusion that PLD of Cr8O21 targets yields in thin films containing either mixtures of (Cr2O5, CrO2 and Cr2O3) or, under particular conditions of oxygen pressure and substrate temperature, of (CrO2 and Cr2O3) only..

Keywords

Chromium oxides, PLD, Thin films, Raman spectroscopy, Chemical synthesis.

Submitted at: July 14, 2010
Accepted at: Aug. 12, 2010

Citation

O. MONNEREAU, L. TORTET, C. E. A. GRIGORESCU, D. SAVASTRU, C. R. IORDANESCU, F. GUINNETON, R. NOTONIER, A. TONETTO, T. ZHANG, I.N. MIHAILESCU, D. STANOI, H.J. TRODAHL, Chromium oxides mixtures in PLD films investigated by Raman spectroscopy, Journal of Optoelectronics and Advanced Materials Vol. 12, Iss. 8, pp. 1752-1758 (2010)