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Controlling the material properties under extreme conditions and in the vicinity of phase transitions


Work number - P 14 FILED

Presented van Franko National University of Lviv

Authors:
Bryk T.M., Kozlovskii M.P., Peletminskii O.S., Plevachuk Yu.O., Rud O.D., Sklyarchuk V.M., Slyusarenko Yu.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 under extreme thermodynamic conditions, carrid out in the national and foreign laboratories.

The authors grounded theoreticaly a method for controlling the group velocity of light in a Bose condensate using an external magnetic field, which is the basis for the creation of atomic lasers, supersensitive optical switches, devices for focusing and accumulation of energy in solar panels during cloudy 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-based eutectic systems are the basis for non-polluting and environmentally safe lead-free solders used in the electronic industry and household appliances. A separate application area is nuclear and nuclear power engineering, where the materials studied can be used as a variety of sensors and coolants. 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.

Number of publications: 185, incl. 11 monographs (3 - published abroad), 174 articles (164 - in English-language magazines with impact factor). The total number of the publication citations to / h-index of the work according to the databases are respectively: Web of Science - 2026/23, Scopus - 2130/23, Google Scholar - 2966/27. Six (6) doctoral and twenty three (23) PhD theses were defended on this subject.

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