1. Department of Materials and Components, U.S.T.H.B., Algeria
2. Department of Physics, Dr Tahar Moulay University of Saïda, Saïda, 20000, Algeria
3. Department of Materials Technology U.S.T.O MB, BP 1505, Oran, Algeria
4. Theoretical Physics Laboratory, U.S.T.H.B, Algiers, Algeria