1. Department of Chemistry, Moscow State University, 119899 Moscow, Russia, LMGP, UMR 5628 CNRS, ENSPG, BP 46, 38402 St. Martin d'Hères, France, and National Centre for HREM, Laboratory of Materials Science, Delft University of Technology, Rotterdamseweg 137, 2628 AL Delft, The Netherlands