1. São Carlos Institute of Physics, University of São Paulo, PO Box 369, São Carlos, SP 13560-970, Brazil
2. Grupo de Materiais Inorgânicos Multifuncionais, Institute of Chemistry, Rio de Janeiro State University, Rio de Janeiro, RJ 20550-013, Brazil
3. Institute of Chemistry, São Paulo State University (UNESP), Araraquara, SP 14801-970, Brazil