1. Faculty of Physics, University of Białystok, Lipowa 41, 15-424 Białystok, Poland
2. Institute of Non Ferrous Metals in Gliwice, J. Sowińskiego 5, 44-100 Gliwice, Poland
3. Institute of Chemistry, University of Białystok, Hurtowa 1, 15-399 Białystok, Poland
4. Faculty of Materials Science and Engineering, Warsaw University of Technology, Wołoska 141, 02-507 Warszawa, Poland