1. University of Sfax, Faculty of Sciences of Sfax, Laboratory of Materials Science and Environment, P. B. No. 1171-3000, Sfax, Tunisia
2. University of Sfax, Faculty of Sciences of Sfax, Department of Physic, Laboratory of Applied Physic, B. P. No. 802, 3018 Sfax, Tunisia
3. Institute of Crystallography–CNR, Via Salaria Km 29.300, 00016 Monterotondo, Rome, Italy