1. Bulent Ecevit University, Metallurgical and Materials Engineering Department, 67100, Zonguldak, Turkey
2. Istanbul Technical University, Metallugical and Materials Engineering Department, 34469, Istanbul, Turkey
3. Istanbul Technical University, Physics Engineering Department, 34469, Istanbul, Turkey
4. Gebze Institute of Technology, Department of Physics, 41400 Gebze, Kocaeli, Turkey