1. Taras Shevchenko National University of Kyiv; 01601 64/13 Volodymirska st. Kyiv Ukraine
2. STC “Institute for Single Crystals” NAS of Ukraine; 60 Lenina ave. Kharkiv 61001 Ukraine
3. A.V. Bogatsky Physico-Chemical Institute; National Academy of Sciences of Ukraine; 86, Lustdorfskaya doroga 65080 Odessa Ukraine