1. Advanced Materials Research Laboratory, Department of Nanoscience and Nanoengineering, Graduate School of Natural and Applied Sciences, Ataturk University, Erzurum, Turkey
2. Department of Science Teaching, K.K. Education Faculty, Ataturk University, Erzurum, Turkey
3. Department of Min. Engn., Oltu Earth Sci. Fac., Ataturk University, Erzurum, Turkey
4. Department of Basic Sciences, Science Faculty, Erzurum Technical University, Erzurum, Turkey
5. Department of Physics, Science Faculty, Ataturk University, Erzurum, Turkey
6. Department of Elect. & Elect. Engn., Engineering Faculty, Ardahan University, Ardahan, Turkey