1. Department of Inorganic Chemistry, Physical Chemistry and Electrochemistry, Faculty of Chemical Engineering and Biotechnologies, National University of Science and Technology POLITEHNICA Bucharest, 1-7 Gh. Polizu St., District 1, 011061 Bucharest, Romania
2. National Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, Romania
3. Faculty of Physics, University of Bucharest, Atomistilor 405, 077125 Magurele, Romania