Total number
Full text
Total number
Full text
Number of local repositories
Full text
0225U005205,
(0121U108687)
,
A theory of phase transformations, kinetic and diffusion phenomena in condensed media
Дослідження властивостей низькорозмірних взаємодіючих електрон та фононних систем і фазових переходів в них. Розмірні ефекти і кінетика енергетичної релаксації квазічастинок в тонкоплівкових структурах.
Bakai Oleksandr S.,
27-12-2025
National Science Center "Kharkiv Institute of Physics and Technology"
Development of theoretical and computer models to describe phase transformations and states, including nucleation theory in amorphous and multicomponent materials; kinetic and diffusion phenomena in condensed and disordered media; the emergence of dynamic chaos; study of memory effects in diffusion and their impact on equilibrium and nonequilibrium phase transformations; stability study and interactions of chemical reaction systems in a heterogeneous medium and in a medium with phase transformations; study of thermodynamic properties of interacting electron systems and phonons in nanostructures. Perform MD modeling of the influence of compositional ordering on martensitic transformations in binary NiAl alloy. Describe the properties of quark – gluon matter.
The first section of the report describes in detail the results of research for 2025. A method for statistical description of quantum Fermi and Bose systems with an arbitrary even small number of particles is proposed. The distribution functions of Fermi and Bose particles are obtained, which transform into standard Fermi-Dirac and Bose-Einstein distribution functions in the case of a large volume. For the Fermi gas filling the space inside cubic and spherical cavities of a fixed volume, based on the method developed in, at arbitrary temperatures and number of particles, thermodynamic characteristics are calculated, namely: entropy, thermodynamic potential, energy, pressure, heat capacities and thermodynamic coefficients. The discrete structure of energy levels is taken into account and size effects at low temperatures are studied. Within the framework of the semi-phenomenological three-temperature approach based on the kinetic Boltzmann equations, the temperature dynamics of electrons, phonons and magnons in a layered heterostructure consisting of a thin film of a normal metal (NM), a layer of a ferromagnetic insulator (FI) and a massive dielectric substrate were considered. The dependence of the constant and variable voltage components of the reverse spin Hall effect on the thickness of the FI layer during periodic heating of the NM was found. From the agreement between the obtained theoretical results and experiments on Pt/YIG heterostructures, the values of a number of microscopic parameters characterizing the interaction of electrons and phonons with magnons were found. The second section presents the most important results obtained during the period of implementation of the topic (2021-2025). Based on the results of the research, 2 monographs, 98 articles in scientific periodicals were published. 28 reports were presented at conferences.
Petro O. Mchedlov-Petrosian
Yurii M. Poluektov
Anatolii A. Turkin
Oleksii O. Soroka
Mykola P. Lazariev
Halyna M. Lavrova
Oleksii V. Chechkin
Oleksandr O. Borysenko
Yurii P. Stepanovskyi
Leonid M. Davydov
Oleksandr S. Abyzov
Oleksii I. Bezuhlyi
Mykola V. Alekseiechkin
Volodymyr V. Kotliar
2025-12-27
Updated: 2025-12-28
Saving a scientific data set occurs in two stages:
1.) Creating a data set
Enter the name of the set, a brief description of the set (annotation), and click the “Create set” button. After that, a draft data set will be automatically created, which you can save for further work with the set. The system will redirect you to the “Data set information” page.
2.) Filling in the data
On the “Data set information” page, you need to fill in all the fields related to the data set and upload the files.
Please note! Each file is uploaded separately. This is done to ensure the stable operation of the system.
Once you have filled in the information about the scientific data set and added the necessary files, you can save the draft or send the data to the system.
Please note! Once the data has been sent, you cannot change it.
Drafts are necessary for storing the data set and editing it before sending.
All accounts on the NRA website go through a standard registration procedure and are verified. However, in order to obtain additional features, such as publishing open reviews of academic texts, verification by affiliation is required.
To obtain the status “verified”, you must change your primary email address to a corporate one, which is tied to a scientific or educational institution.
For example: user@ukrintei.ua, user@nas.gov.ua
After confirming your corporate email address, your account will be automatically verified by affiliation.
If your email address is corporate, but your account does not have a verification mark, you need to write to us at the email address NRAT@ukrintei.ua. After verification, we will add your address to the database, and your account will be verified.
After completing the verification procedure for affiliation, you can change the primary email address to a convenient one for you, without losing your status during the current verification.
You only need to verify for affiliation once.
* We use corporate addresses from the Unified State Database on Education and the State Register of Scientific Institutions Supported by the State
To search for news published on the official website of NRАT in the “News” section, you need to enter one word, several words, or an exact phrase in the search field. Different terms are separated by spaces.
The search is performed everywhere – in the title and the news text.
For a more comprehensive result, it is recommended to use word stems (parts of words without endings).
When using multiple words for the search, they are combined using one of the logical methods described below.
By default, the logical connector “and” is used. In this case, search results will include all news releases that contain the specified words, even if they are located separately from each other and are in different parts of the text.
Example: Search phrase: OECD report. Search result: all news containing the words “report” and “OECD” in the text and in the title, both together and separately.
If a phrase or phrase is enclosed in quotation marks (“), the results will include all publications where this exact phrase or phrase is found.
Example: Search phrase: “OECD report.” Search result: all news containing the exact phrase “OECD report.”
If you know the publication date of the news or are interested in a specific time frame in which they were published on the website, you can select such a date or date range in the additional field that looks like a calendar. The date is entered in the format year-month-day and confirmed by clicking on the corresponding date in the calendar dropdown. You can enter a date or choose one by browsing through the calendar by months and years. By default, the interval starts from the oldest date (2018-01-23) and ends with the current date.
You can also use one or more hashtags, which are located under the search field on the right side of the “News” page.
Please note: The search for academic texts is carried out in a separate search window at the following link https://nrat.ukrintei.ua/searchdb.
