1. Vienna University of Technology, Institute of Materials Chemistry, Getreidemarkt 9/165-AC, A-1060 Vienna, Austria
2. Ivoclar Vivadent AG, Bendererstrasse 2, FL-9494 Schaan, Principality of Liechtenstein
3. University of Trento, Department of Materials Engineering and Industrial Technologies, Via Mesiano 77, I-38123 Trento, Italy
4. University of Stuttgart, Institute of Physical Chemistry, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
5. Saarland University, Inorganic Solid State Chemistry, Am Markt Zeile 3, D-66125 Saarbrücken, Germany