1. Institute of Materials Chemistry and Research
2. University of Vienna
3. A-1090 Vienna
4. Austria
5. Institute of Physical Chemistry
6. Institute of Physics of Materials
7. Academy of Sciences of the Czech Republic
8. 61662 Brno
9. Czech Republic
10. Institute of Solid State Physics
11. TU Wien
12. A-1040 Vienna
13. Christian Doppler Laboratory for Thermoelectricity
14. Institute of Mineralogy and Crystallography