1. Institute of Physics and Chemistry, Federal University of Itajuba (UNIFEI), Itajubá, MG, 37500-903, Brazil
2. LSQM – Laboratory of Chemical Synthesis of Materials – Department of Materials Engineering, Federal University of Rio Grande do Norte, P.O. Box 1524, Natal, RN 59078-900, Brazil
3. CDMF-LIEC, UFSCar, P.O. Box 676, São Carlos, SP 13565-905, Brazil
4. Departamento de Física, Universidade Federal de São Carlos, São Carlos, São Paulo, 13565-905, Brazil