1. Institute of Materials Science; TU Bergakademie Freiberg; Gustav-Zeuner-Straße 5, 09599 Germany
2. Institute of Ceramic, Glass and Construction Materials; TU Bergakademie Freiberg; Agricolastraße 17, 09599 Germany
3. Institute of Experimental Physics; TU Bergakademie Freiberg; Leipziger Straße 23, 09599 Germany
4. Institute of Theoretical Physics; TU Bergakademie Freiberg; Leipziger Straße 23, 09599 Germany