1. Institute of Metal Physics of Russian Academy of Sciences, Urals Division, 18 S. Kovalevskaya Str., Yekaterinburg 620990, Russia
2. Bayerisches Geoinstitut, Universität Bayreuth, Universitätsstr. 30, Bayreuth D-95447, Germany
3. Institute for Solid State Chemistry of Russian Academy of Sciences, Urals Division, 91 Pervomayskaya Str., Yekaterinburg 620049, Russia