Bagatskii Mikhail Ivanovich

Bagatskii Mikhail Ivanovich is Leading researcher, Doctor of Physics & Mathematics in Department of Thermal properties and structure of Solids and nanosystems of B.I. Verkin Institute for Low Temperature Physics and Engineering of National Academy of Sciences of Ukraine. Bagatskii M.I. was born 16th September, 1939. He graduated in 1962 from Kharkov State University (renamed in V.N.Karazin Kharkiv National University). Since 1962 he has working at the Institute for Low Temperature Physics and Engineering of NAS of Ukraine in the Department of Thermal Properties of Molecular Crystals. Since 1962, Bagatskii M.I. has been engaged in calorimetric investigations at low temperatures. Bagatskii M.I. got the degree of Candidate of Physical and Mathematical Sciences (01.04.09–Low Temperature Physics) in 1972. Since 2001, he is a Doctor of Physical and Mathematical Sciences (01.04.09–Low Temperature Physics). He is an author and co-author of over 100 scientific publication and investigations.

Professional activity:

B.I. Verkin Institute of Low Temperature Physics and Engineering, NAS of Ukraine, Department of Thermal Properties and Structure of Solids and Nanosystems.

  • 1962 - 1966 — engineer
  • 1966 – 1972 — senior engineer
  • 1972 – 1978 — junior research fellow
  • 1978 – 2003 –— senior research fellow
  • 2003 - to the present –— leading research fellow

Research interests:

Physical properties of new promising carbon-based nanomaterials; Functionalization of nanomaterials, Carbon nanotubes, Fullerite, Heat capacity and calorimetry, Low- temperature dynamics of one-dimensional adsorbate chains and matrix isolated molecules, Quantum and dimensional effects, Physics of glasses and amorphous solids, Orientationally-disordered systems.

Adiabatic calorimetry

Bagatskii M.I. with co-workers have developed and constructed a unique adiabatic colorimeter permitting investigations of thermal effect in crystals and the heat capacity of quantum and classical molecular crystals (cryocrystals) in temperature interval of 0.4 300 К. Phase transitions, lattice dynamics of quantum molecular crystals (H2, HD, D2, CH4) and their solution, classical cryocrystals (Ne, Ar, Kr, Xe, N2, CO2, CO, ND3, NH3, CH4, CD4, CCl4, SF4, and so on) and their solytions, dynamic of disordered systems, impacts of various factor on heat transfer in a system with superfluid helium were investigated. The second adiabatic calorimeter setup for the study of the heat capacity of nanomaterials in the temperature range from 2 to 300 K was constructed in 2011. The adsorption pump removes helium vapor from the bath. The calorimeter can be cooled up to 2 K by pumping helium vapor from 4He bath of the cryostat. Samples can be dopped by gases in the calorimeter cell. The calorimetric cell (see Fig. above) is placed into a vacuum chamber of calorimeter. The adiabatic conditions of the experiment are maintained by controlling the temperature of the adiabatic shield [Low Temp. Phys. 37, 424 (2011)].

Adiabatic calorimeter was designed in ILTPE NASU so that allows precision measurements of the heat capacity of carbon nanomaterials and 1D chains of adsorbed gas impurities on the outer surface of bundles of single-walled carbon nanotubes. Measurements of heat capacity provide information about the specific phase transitions and quantum phenomena in solids including temperature behaviour of heat capacity, heats of phase transition, conversion, quantum diffusion (configuration relaxation). [Low Temp. Phys.42, 788 (2016)]. Scatch of the Low-temperature adiabatic calorimeter for studying the heat capacity of solids and nanomamterials is shown in Fig. above.

Heat capacity of 1D chains of Xe atoms adsorbed in the grooves of c- SWСNTs bundles

The article "Experimental heat capacity of 1D chains of Xe atoms adsorbed in the grooves of c- SWСNTs bundles: contributions of vibrations and spatial redistribution of atoms" [Low Temp. Phys. 49(8), 979 (2023)] was awarded on the Final scientific conference of the B.I. Verkin Institute of Low Temperature Physics and Engineering, NAS of Ukraine in 2023.

Scientific cooperation:

The group maintains a continuous scientific information exchange with researchers in different countries in the frame of the regular International seminars "Heat Capacity and Thermal Conductivity of Solids at Low Temperatures". On cooperation bases with the Department of Experimental Physics Umea University (Sweden) have been performed complex of study of the heat capacity of fullerite C60 (pure and doped with various gases). Some principal results about the heat capacity of the carbon nanotubes were obtained in cooperation with the co-authors from Institute of Low Temperature and Structure Research PAS (Wroclaw, Poland).

Some principal results obtained by calorimetric group:

The specific heat of thermally reduced graphene oxide (trGO) was studied in the temperature range from 0.3 to 275 K. It has been established that in the temperature range of 0.3–6 K there is an anomalous behavior of the temperature dependence of the heat capacity of trGO is due to the influence of impurities and defects, structural features in trGO. [Low Temp. Phys. 50(2), 185-187 (2024)].

The influence of defects and geometric sizes of multi-walled carbon nabotubes on their heat capacity was experimentally studied. The heat capacity of MWCNTs modified by grinding and oxidation with different average outer diameters demonstate the effects of size and dimensionality. Therefore, the character of the temperature dependences of the specific heat of ground and ground-oxidized MWCNTs with various diameters differs fundamentally below ≈140 K [Thermal Science and Engineering Progress, 26, 101097 (2021)].

Awards:

Dr. M.I. Bagatskii received the Honorary Certificate of the National Academy of Sciences of Ukraine in 2009 for professional achievements.

Network and memberships:

International Conference “Condensed Matter & Low-Temperature Physics”

Members of the calorimetric group are involving in the reviewing the abstracts on the International Conference “Condensed Matter & Low-Temperature Physics”. Dr. Barabashko M.S. was the member of the Organizing Committee of the International Conference “Condensed Matter & Low-Temperature Physics” (since 2011).

Scientific Council "Molecular Physics, Physics of Cryogenic Liquids and Crystals" in the B. Verlin ILTPE NASU

Prof. Bagatskii M.I. and Sumarokov V.V are members of the Scientific Council "Molecular Physics, Physics of Cryogenic Liquids and Crystals" in the B. Verkin ILTPE of NASU.

Thermal Kharkiv Seminars: "Heat Capacity and Thermal Conductivity of Solids at Low Temperatures"

Dr. Barabashko M.S. is the member of the Kharkiv Local Organizing Committee of regular International seminars "Heat Capacity and Thermal Conductivity of Solids at Low Temperatures". Partners & Co-organizers of the seminars: V.N.Karazin Kharkiv National University (Kharkiv, Ukraine), Institute of Low Temperature and Structure Research PAS (Wroclaw, Poland), Osaka University (Osaka, Japan), Universidad Autónoma de Madrid (Madrid, Spain).

Journal Fizyka Nyzkykh Temperatur

Members of the calorimetric group are regularly involving in the reviewing the articles to the journal Fizyka Nyzkykh Temperatur. Dr. Barabashko M.S was coorganizer of the III International Advanced Research Workshop “Thermal Conductivity of Solid States at Low Temperatures” (online), Kharkiv, Ukraine October 25, 2023. The articles of the presented results on this event were published in the Issue 5 Volume 50 of the journal Fizyka Nyzkykh Temperatur [Low Temp. Phys. 50, 361–363 (2024)].