1. Department of Physics, Faculty of Art and Science, Süleyman Demirel University, 32260 Isparta, Turkey
2. Department of Materials Science and Engineering, Faculty of Engineering, Afyon Kocatepe University, 03200 Afyonkarahisar, Turkey
3. Department of Physics, Faculty of Art and Science, Ömer Halisdemir University, 51200 Nigde, Turkey