1. Syktyvkar State University, Oktyabrsky Prospect 55, Syktyvkar 167001, Russia
2. Department of Crystallography, Institute of Earth Science, Saint Petersburg State University, University Emb. 7/9, St. Petersburg 199034, Russia
3. St. Petersburg State University, Universitetsky pr. 26, St. Petersburg 198504, Russia
4. Institute of Physics and Mathematics of the Komi Science Center UB RAS, Oplesnina st. 4, Syktyvkar 167982, Russia
5. Institute of Solid State Physics RAS, Chernogolovka, Moscow District 142432, Russia
6. Institute of Chemistry of the Komi Science Center UB RAS, Pervomaiskaya st. 48, Syktyvkar 167982, Russia