1. Institute of Particle Technology, Friedrich-Alexander University Erlangen-Nuremberg, Cauerstrasse 4, 91058 Erlangen, Germany
2. Institute of Materials Chemistry, Vienna University of Technology, Veterinärplatz 1/GA, 1210 Vienna, Austria
3. University Service Center for Transmission Electron Microscopy, Vienna University of Technology, Wiedner Hauptstrasse 8-10/052, 1040 Vienna, Austria
4. Institute of Inorganic Chemistry I, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany
5. Materials Chemistry, University Salzburg, Hellbrunnerstrasse 34, 5020 Salzburg, Austria