1. European Synchrotron Radiation Facility (ESRF) Grenoble France
2. Instituto de Ciencia de Materiales de Madrid, CSIC Madrid Spain
3. Department of Environmental Engineering Federal University of Campina Grande Pombal Brazil
4. Optical Spectroscopy and Raman Scattering Research Group Federal University of São Carlos São Carlos Brazil
5. São Carlos Institute of Physics University of São Paulo São Carlos Brazil