1. Institute of Particle Technology, University of Erlangen-Nuremberg, Cauerstr. 4, 91058 Erlangen, Germany
2. Department of Materials Science WW-4 LKO, University of Erlangen-Nuremberg, Martensstr. 7, 91058 Erlangen, Germany
3. Department of Chemistry and Pharmacy, Inorganic & General Chemistry, University of Erlangen-Nuremberg, Egerlandstrasse 1, 91058 Erlangen, Germany