1. Institute of Advanced Ceramics, Hamburg University of Technology, Denickestrasse 15, D-21073 Hamburg, Germany
2. Department of Mechanical Engineering, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
3. Institute of Physical Chemistry, University of Hamburg, Grindelallee 117, 20146 Hamburg, Germany
4. Institute of Material Systems Modeling, Helmholtz-Zentrum Hereon, Max-Planck Straße 1, 21502 Geesthacht, Germany