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Registration Number

0221U102158, 0120U000117 , R & D reports

Title

Control of the magnetocaloric effect in metal-oxygen perovskites by external factors

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Head

Liedienov Mykyta O,

Registration Date

28-01-2021

Organization

Galkin Donetsk Institute of Physics and Technology of the National Academy of Sciences of Ukraine

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 The first stage of work is devoted to obtaining new nanopowder and bulk ceramic materials and the study of their structural, magnetic, magnetothermal and magnetocaloric properties under the influence of external factors. The purpose of this stage was to obtain promising materials based on metal-oxygen perovskites with improved magnetic properties, as well as their management due to external factors. To achieve this goal, various chemical methods of sampling, X-ray diffraction method on Rigaku D / max-2500, scanning electron microscopy on FEI Magellan 400 and transmission electron microscopy on JEOL JEM-2200FS, as well as magnetic method on LDJ-9500 and Quantum Design SQUID were used. MPMS 3 magnetometers. The influence of methods of obtaining samples, particle and grain size, as well as the degree of doping on the functional properties of perovskites was established. For the first time, an additional contribution of superparamagnetism to the magnetocaloric effect was revealed with the establishment of the nature of its appearance in rare-earth manganites. Multifunctional materials have been synthesized that can be used in non-volatile devices for recording and storing information, as electrocatalysts in air batteries, in magnetic cooling devices with temperature stabilization, as well as for local magnetic hyperthermia in medicine. Keywords: perovskite structure, nanopowder, ceramics, Curie temperature, magnetization, entropy, magnetocaloric effect, the specific power of losses.

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Bodnaruk Andriy V
Kuchuk Olena I
Liedienov Mykyta O

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2021-01-28