1. Institute of Physics, Montanuniversitaet Leoben, Franz-Josef-Str. 18, A-8700 Leoben, Austria
2. Department of Materials Science, Montanuniversitaet Leoben, Franz-Josef-Str. 18, A-8700 Leoben, Austria
3. Institute of Structural and Functional Ceramics, Montanuniversitaet Leoben, Peter-Tunner-Str. 5, A-8700 Leoben, Austria