1. Nottingham Trent University
2. School of Science and Technology
3. Nottingham, UK
4. University of Ioannina
5. Department of Materials Science and Engineering
6. 45110 Ioannina, Greece
7. University of Durham
8. G. J. Russell Microscopy Facility
9. Durham, UK
10. Aristotle University of Thessaloniki
11. Department of Physics
12. 54124 Thessaloniki, Greece
13. Sheffield Hallam University
14. Materials and Engineering Research Institute