1. G.V. Kurdyumov Institute for Metal Physics, NAS of Ukraine, 36 Bulvar akademika Vernadskogo, Kiev-142 03680, Ukraine
2. G.V. Kurdyumov Institute for Metal Physics, NAS of Ukraine, 36 Bulvar akademika Vernadskogo, Kiev-142 03680, Ukraine and Vasyl Stus Donetsk National University, 21, 600-richya str., Vinnytsia 21021, Ukraine