1. Chemistry Department, Moscow State University, 119991 Moscow,
Russia
2. Laboratoire de Crystallographie, École Polytechnique Fédérale de Lausanne, BSP, CH-1015 Lausanne, Switzerland
3. Phase Solutions Ltd., CH-1012 Lausanne,
Switzerland
4. Institute of Solid State Physics, 142452 Chernogolovka, Russia
5. Laboratoire CRISMAT, UMR 6508 CNRS ENSICAEN, 6bd Maréchal Juin, 14050
Caen, France
6. EMAT, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium