1. High Pressure Group, Institute of Metal Physics of Russian Academy of Sciences, Urals Division, 18 S. Kovalevskaya Str., GSP- 170, Yekaterinburg 620041, Russia
2. The Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa 277-8581 Chiba, Japan
3. Institut de Minéralogie et de Physique des Milieux Condensés, Université Pierre et Marie Curie Paris 6 − CNRS, 140 rue de Lourmel, 75015 Paris, France
4. Bayerisches Geoinstitut, Universität Bayreuth, Universitätsstrasse 30, D-95447, Bayreuth, Germany