Abstract
This research was funded by the Science Committee of the Ministry of Education and Science of the Republic of Kazakhstan (No. BR18574135). In addition, M. K and A.I.P. were supported by EUROfusion Enabling Research Project ENR-MAT.02.ISSP-UL- \u201CNew dielectric functional materials and interfaces (DFMI) \u2013 Theoretical and Experimental analysis.\u201D This work has been carried out within the framework of the EUROfusion Consortium, funded by the European Union via the Euratom Research and Training Programme (Grant Agreement No 101052200 \u2014 EUROfusion). Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or the European Commission. Neither the European Union nor the European Commission can be held responsible for them. The research was performed in the Center of Excellence of the Institute of Solid-State Physics, University of Latvia, supported through European Unions Horizon 2020 Framework Programme H2020-WIDESPREAD-01-2016-2017-TeamingPhase2 under grant agreement No. 739508, project CAMART2.