Antoni Kania 1, Adrian Niewiadomski 1, Seweryn Miga 2, Godefroy Kugel 3, Mustapha Hafid 4, Jan Dec 2
1 A. Che?kowski Institute of Physics, University of Silesia, Katowice, Poland, 2 Institute of Materials Sciemce, University of Silesia, Chorzow, Poland, 3 University of Metz, Supelec Metz, Metz, France, 4 Faculty of Science, Ibn Tofail University, Kenitra, Morocco