1. Christian Albrechts University Kiel, Institute for MaterialsScience, Synthesis and Real Structure, Kaiserstr. 2, 24143 Kiel, Germany
2. University of Siegen, Inorganic Chemistry I, Adolf‐Reichwein‐Straße 2, 57068 Siegen, Germany, Fax: +49‐271‐740‐2555
3. Department of Chemistry, Northwestern University, 2145 Sheridan Rd, Evanston, IL 60208, USA
4. Max Planck Institute for Solid State Research, Heisenbergstraße 1, 70569 Stuttgart, Germany
5. German Aerospace Center, Linder Höhe, 51147 Köln, Germany