1. Fraunhofer Institute for Physical Measurement Techniques IPM
2. Thermoelectric Systems
3. 79110 Freiburg
4. Germany
5. Institute for Materials Science
6. Synthesis and Real Structure
7. Christian-Albrechts-University
8. 24143 Kiel
9. Institute of Inorganic Chemistry
10. 24118 Kiel
11. Max Planck Institute for Solid State Research
12. 70569 Stuttgart