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Controlling the physical effects at extreme conditions and in vicinity of phase transitions for emerging future technologies


Work number - P 16

IvanFranko National Universityof Lviv,

Ministry of Education and Science of Ukraine

 

BrykT.M., KovalevskyM.Yu., KozlovskiiM.P., PeletminskiiO.S.,

PlevachukYu.O., SklyarchukV.M., SlyusarenkoYu.V., Sotnikov A.G.

 

The aim of the work is to describe and analyze the phase states, which arise in materials under extreme conditions and demonstrate new and unusual properties, in particular in the vicinity of the phase transformation points, in order to obtain new knowledge about materials and their possible application in qualitatively new technologies of the future. The work cycle covers an intercompatible study of different types of phase transformations in complex physical systems, in wide ranges of control parameters such as temperature, pressure and external field.

The novelty and reliability of the results are based on the complex nature of the research, which is to combine the three main methods of knowledge of physical phenomena: (i) microscopic theories, (ii) techniques of first-principle computer modeling, (iii) precision experimental research in extreme thermodynamic conditions in domestic and foreign laboratories.

The authors grounded theoreticaly a method of controlling the group velocity of electromagnetic waves and a description of the phenomena of strong slow-down of the stop and filtering of light in systems with Bose condensate. Effects and phenomena can be used to create atomic lasers, supersensitive optical switches, devices for focusing and accumulation of energy in solar panels in dark weather. Investigated tellurium and selenium based materials, which reveal a metal-nonmetal phase transition during temperature and concentration changes, are suitable for use in metallurgy, instrumentation, engineering, space engineering, nuclear power engineering or as a matrix of dispersion mixtures in semiconductor instrumentation. The practical value of investigation of the monothectic systems consistes in their suitability for materials with finely divided mixtures, in particular self-lubricating, low-friction and wear-friction bearings for the automotive industry. Tin (Sn) eutectic systems are the basis for non-polluting and environmentally safe lead-free solders used in the electronic industry and household appliances. In the framework of developed techniques of first-principle molecular dynamics, the properties of iron at ultrahigh pressure (about 12 GPa) are explained, which is important for geophysics. Areas of applicability of the properties of high-spin magnetics are associated with the need miniaturization of devices and the growth of requirements for the parameters of magnetic materials.

The work contains 157 publications, including 7 monographs, a chapter in a collective monograph, reviews and articles in scientific periodicals published by the authors in journals cited by SCOPUS, as well as 2 popular scientific works. According to ISI Web of Knowledge, the scientific works included in the cycle received about 1600 quotes, and their h-factor is 22 (the total number of citations of the authors of the cycle is 3062, the total h-factor is 75). On the subject of the cycle 6 doctoral and 18 candidate's theses are defended.

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