1. State Key Laboratory of Superhard Materials International Center of Future Science Jilin University Changchun 130012 P. R. China
2. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of Chemistry Jilin University Changchun 130012 P. R. China
3. Donetsk Institute for Physics and Engineering named after O.O. Galkin NAS of Ukraine Kyiv 03028 Ukraine
4. Taras Shevchenko National University of Kyiv Kyiv 01030 Ukraine
5. Institute of Nanotechnology Karlsruhe Institute of Technology 76021 Karlsruhe Germany
6. Institute of Magnetism NAS of Ukraine and MES of Ukraine Kyiv 03142 Ukraine