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Приходько, Кирилл Евгеньевич

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Цель ИЯФиТ и стратегия развития - создание и развитие научно-образовательного центра мирового уровня в области ядерной физики и технологий, радиационного материаловедения, физики элементарных частиц, астрофизики и космофизики.

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Приходько

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Кирилл Евгеньевич

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Только метаданные
Application of Electron Energy-Loss Spectroscopy for Analysis of the Microstructure of Reactor Materials
(2021) Dement'eva, M. M.; Prikhod'ko, K. E.; Приходько, Кирилл Евгеньевич
© 2021, Pleiades Publishing, Inc.Abstract: It is shown by the example of hydrogen (in hydrides ZrH), helium (in pores after implantation), and nickel (in G-phase precipitates) that the application of electron energy-loss spectroscopy within the scanning transmission electron microscopy method makes it possible to analyze the distribution of different chemical elements in the microstructure of reactor materials. The advantages of electron energy-loss spectroscopy (in comparison with energy-dispersive spectroscopy) for studying irradiated materials and important experimental conditions of the formation of energy loss spectra are discussed.
Только метаданные
Creation of Thin Films of NbN at Room Temperature of the Substrate
(2021) Gurovich, B. A.; Goncharov, B. V.; Kutuzov, L. V.; Stolyarov, L. V.; Prikhod'ko, K. E.; Приходько, Кирилл Евгеньевич
© 2021, Pleiades Publishing, Ltd.Abstract: Magnetron sputtering is used for preparing thin NbN films. The films are deposited on sapphire substrates at temperatures from 20 to 300°C. The superconducting transition temperature for various samples is in the range of 8–14 K depending on the substrate temperature during deposition. The critical current density jc is in the range of 0.8–8 MA/cm2, which makes it possible to use these films to create multilayer structures due to the absence of anneals, which each underlying layer of structures is subjected to during the deposition of each subsequent layer.
Только метаданные
Creation of Elements from NbN for Logical Devices of Classical Cryo-Computers
(2021) Gurovich, B. A.; Prikhodko, K. E.; Kutuzov, L. V.; Goncharov, B. V.; Приходько, Кирилл Евгеньевич
A method is described that allows one to reduce the critical current and switching power of a short nanowire from a superconducting state to a normal state by embedding a section of a normal metal into the nanowire. This effect results from the local heating of the superconducting wire due to the heat released in the normal metal. An integrated resistor is created from the original NbN using ion irradiation through a mask. The obtained values of switching powers allow designing multilayer logical elements without galvanic coupling for classical cryo-computers.
Открытый доступ
Advanced structure research methods of amorphous Co69Fe4Cr4Si12B11 microwires with giant magnetoimpedance effect: Part 1 – Crystallization kinetics and crystal growth
(2021) Svetogorov, R. D.; Chernavskii, P. A.; Lukyanchuk, A. A.; Shutov, A. M.; Elmanov, G. N.; Kozlov, I. V.; Irmagambetova, S. M.; Prikhodko, K. E.; Елманов, Геннадий Николаевич; Козлов, Илья Владимирович; Ирмагамбетова, Сауле Муханбетовна; Приходько, Кирилл Евгеньевич
© 2021 Elsevier B.V.The initial stage processes of nucleation and growth of crystalline phases in Co-based amorphous microwires in a glass shell were studied by processing kinetic curves using various theoretical models. The results of X-ray diffraction for research of the microstructure evolution at Synchrotron Radiation Source and High Resolution Transmission Electron Microscopy were considered. The study of the crystallization process kinetics was carried out by a non-conventional method, in particular based on data of sample magnetization changes over time and with temperature at a unique in situ vibromagnetometer. The analysis of the kinetic curves for isothermal and non-isothermal crystallization process led to the similar conclusions and made it possible to establish the values of the Avrami exponent for the initial stage of surface and bulk crystallization, to establish the dimensionality of crystal growth, and to conclude that there was no nucleation in the process of crystal growth. Based on the analysis of kinetic curves by three methods, the activation energy of the primary crystallization process was determined, its high value is associated with the presence of chromium in the alloy, which determines its nanocrystallization. The microstructure and shape of crystals were analyzed.
Открытый доступ
Advanced structure research methods of amorphous Co69Fe4Cr4Si12B11 microwires with giant magnetoimpedance effect: Part 3 – Cluster growth and crystal nucleation
(2024) Kozlov, I. V.; Elmanov, G. N.; Lukyanchuk, A. A.; Shutov, A. S.; Prikhodko, K. E.; Козлов, Илья Владимирович; Елманов, Геннадий Николаевич; Приходько, Кирилл Евгеньевич
Открытый доступ
ВЛИЯНИЕ ОСОБЕННОСТЕЙ НАНОСТРУКТУРЫ НА МАГНИТНЫЕ СВОЙСТВА АМОРФНЫХ СПЛАВОВ НА ОСНОВЕ КОБАЛЬТА
(НИЯУ МИФИ, 2023) Козлов, И. В.; Елманов, Г. Н.; Приходько, К. Е.; Гудошников, С. А.; Приходько, Кирилл Евгеньевич; Козлов, Илья Владимирович; Елманов, Геннадий Николаевич
Магнитные свойства аморфных сплавов в значительной степени зависят от состава и технологических параметров их изготовления. При необходимости магнитные характеристики могут быть изменены за счет влияния на процесс эволюции аморфной фазы. Тонкая структура и магнитные свойства аморфных кобальтовых сплавов претерпевают значительные изменения при их нагреве до температур заметно ниже температуры кристаллизации, происходит упорядочение атомных областей. Аморфные сплавы со значительной степенью упорядоченных термически индуцированных атомных областей (кластеров) в объеме материала зачастую проявляют повышение магнитных свойств. В настоящей работе было изучено влияние таких термически индуцированных атомных областей (кластеров и нанокристаллов) в аморфной матрице на характер петель гистерезиса, поле анизотропии (Ha) и коэрцитивную силу (HC) микропроводов в стеклянной оболочке состава Co69Fe4Cr4Si12B11, полученных методом Улитовского-Тейлора.
Только метаданные
The Influence of Integrated Resistors Formed under Ion Irradiation on the Superconducting Transitions of Niobium Nitride Nanoconductors
(2020) Gurovich, B. A.; Goncharov, B. V.; Dement'eva, M. M.; Kutuzov, L. V.; Prikhod'ko, K. E.; Приходько, Кирилл Евгеньевич
© 2020, Pleiades Publishing, Ltd.Abstract: The influence of integrated resistors formed under irradiation in a nanowire on its superconducting transitions has been investigated. Niobium nitride nanowires with widths of 75–20 000 nm fabricated from a 5-nm-thick NbN film on single-crystal silicon substrates coated with a 0.3-μm-thick thermal silicon oxide layer and on sapphire substrates have been considered. The influence of a built-in resistive region on the critical current of transition from the superconducting to normal state is described.
Открытый доступ
The evolution of structure and magnetoimpedance characteristics of amorphous Co69Fe4Cr4Si12B11 microwires under heat treatment
(2020) Kutuzov, L. V.; Svetogorov, R. D.; Mashera, V. S.; Gorelikov, E. S.; Kozlov, I. V.; Elmanov, G. N.; Prikhodko, K. E.; Tarasov, B. A.; Mikhalchik, V. V.; Козлов, Илья Владимирович; Елманов, Геннадий Николаевич; Приходько, Кирилл Евгеньевич; Тарасов, Борис Александрович; Михальчик, Владимир Валерьевич
© 2019 Elsevier B.V.Amorphous Co69Fe4Cr4Si12B11 glass-coated microwires after heat treatment in the temperature range of 250–600 °C during 30 min were investigated. Changes of microstructure, phase composition, fracture morphology, and giant magnetoimpedance (GMI) properties were shown. It is confirmed that a significant increase in the GMI effect was possible not only due to the structural relaxation, but also as a result of phase transformations at the temperature close to the onset of crystallization. It is shown that at the very initial stage of the nucleation of Co nanocrystals, a sharp increase in circumferential diagonal GMI component was observed, a further increase in the amount of the crystalline Co phase was accompanied by degradation of this effect. The most significant GMI ratio was obtained for microwires annealed at 430 °C. At 450 °C and above, an irreversible decrease of the GMI ratio took place. It was caused by the formation of Co crystals, decrease in amount and composition change of the amorphous phase during primary and secondary crystallization. At the final stage of the Co crystals segregation the secondary crystallization of the residual amorphous phase occurred with formation of a metastable τ-phase with a Me23B6 type structure. Thermal stability of the τ-phase was analyzed.
Только метаданные
Integrated cryogenic resistors formed from NbN thin film under ion beam irradiation
(2019) Gurovich, B. A.; Goncharov, B. V.; Dementyeva, M. M.; Kutuzov, L. V.; Prikhodko, K. E.; Приходько, Кирилл Евгеньевич
© Published under licence by IOP Publishing Ltd.Niobium nitride ultrathin films were synthesized by cathode sputtering technique. The cryogenic resistors built in the superconducting nanowire were formed using the radiation technology developed in National Research Centre "Kurchatov Institute". This technique was based on the transformation of NbN superconducting film to a normal state (at 4.2K) under the composite ion beam irradiation through the resistive mask. The formation of the cryogenic resistors in the broad range of values was demonstrated.
Только метаданные
Activator segregation and micro-luminescence properties in GAGG:Ce ceramics
(2021) Dosovitskiy, G.; Dubov, V.; Karpyuk, P.; Volkov, P.; Prikhodko, K.; Приходько, Кирилл Евгеньевич
© 2021ввCeramic scintillators are promising due to their potentially low cost. Here, we report on our study of Ce-doped ceramics. Typical garnet-type ceramics Gd2.97Ce0.03Al2Ga3O12 was fabricated for the study from co-precipitated powders by high-temperature sintering in air. Its structure and composition are characterized using Scanning Electron Microscope (SEM) imaging, Transmission Electron Microscopy (TEM), Electron Energy Loss Spectroscopy (EELS), Electron Backscattered Diffraction (EBSD) mapping, X-Ray Diffraction (XRD) and X-ray Absorption Near Edge Structure (XANES) measurements. The spatial distribution of luminescence properties at the micro-level is studied using scanning confocal microscopy. Cerium segregation at the grain boundaries was revealed by compositional characterization and is in line with enhanced Ce3+ photoluminescence observed at the boundaries. Meanwhile, no excess partitioning of Ce4+ ions at the grain boundaries is observed. It is found that most of Ce ions in the ceramics are stabilized in the state Ce3+, what is encouraging in view of the further development of GAGG:Ce ceramics as a promising luminescence material for lighting and scintillator application.