1. Syktyvkar State University, Oktjabrskij prospect, 55, Syktyvkar, Komi Republic 167001, Russia
2. Department of Crystallography, Institute of Earth Sciences, Saint-Petersburg State University, University Emb. 7/9, 199034 St. Petersburg, Russia
3. Institute of Chemistry of the Komi Science Center UB RAS, Pervomaiskaya st. 48, Syktyvkar, Komi Republic 167982, Russia
4. Institute of Solid State Physics RAS, Chernogolovka, Moscow District 142432, Russia