1. Department
of Chemistry, University of Basel, Basel, Switzerland
2. Laboratory
for High Performance Ceramics, Empa, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland
3. Department
of Physics, Budapest University of Technology and Economics, P.O. Box H-1521, Budafoki út 8, Budapest, Hungary
4. MTA Research Centre for Natural Sciences, Budapest, Hungary
5. MTA-ELTE
Theoretical Physics Research Group, Eötvös Loránd University, Budapest, Hungary