1. Department of Metallurgical and Materials Engineering, Sivas Cumhuriyet University, 58140, Sivas, Turkey
2. Department of Physics, Faculty of Sciences, Ankara University, 06100 Tandogan, Ankara, Turkey
3. Department of Physics, Sivas Cumhuriyet University, 58140 Sivas, Turkey
4. Department of Physics, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran