1. Fraunhofer Institute for Silicate Research ISC
2. 97082 Wuerzburg
3. Germany
4. Department of Chemical Technology of Materials Synthesis
5. University of Wuerzburg
6. Netherlands Organisation for Applied Scientific Research TNO
7. NL-5612 AP Eindhoven
8. The Netherlands
9. Carl Padberg Zentrifugenbau GmbH
10. 77933 Lahr