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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Volova T. G., Golubev A. I., Nemtsev I. V., Lukyanenko A. V., Dudaev A. E., Shishatskaya E. I.
Заглавие : Laser processing of polymer films fabricated from phas differing in their monomer composition
Коллективы : "Biotechnology of new materials - environment - quality of life", International scientific conference, "Биотехнология новых материалов - окружающая среда - качество жизни", международная научная конференция
Место публикации : Биотехнология новых материалов - окружающая среда - качество жизни: материалы IV Международной научной конференция : Красноярск, 10–13 октября 2021 г. - Красноярск, 2021. - С. 51-54
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zhandun V. S., Zamkova N. G., Draganyuk O. N., Shinkorenko A. S., Wiedwald, Ulf, Ovchinnikov S. G., Farle M.
Заглавие : The effect of the composition and pressure on the phase stability and electronic, magnetic, and elastic properties of M2AX (M = Mn, Fe; A = Al, Ga, Si, Ge; X = C, N) phases
Коллективы : Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR); Government of Krasnoyarsk Territory; Krasnoyarsk Regional Fund of Science [20-42-240004]; Government of the Russian Federation [075-152019-1886]; Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)German Research Foundation (DFG) [405553726 -TRR 270]
Место публикации : Phys. Chem. Chem. Phys. - 2021. - Vol. 23, Is. 46. - P.26376-26384. - ISSN 1463-9076, DOI 10.1039/d1cp03427h. - ISSN 1463-9084(eISSN)
Примечания : Cited References: 40. - The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science to the research project no. 20-42-240004: "The effect of the composition, pressure, and dimension on the magnetic, electronic, optical, and elastic properties of the magnetic Mn+1AXn (M = Cr, Mn; Fe, A = Al, Ga, Si, Ge, P, In; X = C, N; n = 1-3) MAX-phases'' and by the Government of the Russian Federation (agreement no. 075-152019-1886). The calculations were performed with the computer resources of "Complex modeling and data processing research installations of mega-class'' SRC "Kurchatovsky Institute'' (http://ckp.urcki.ru).The ternary phase diagrams for the calculation of formation enthalpies were taken from Materials Project (https://materialsproject.org).U.W.and M. F. also thank the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) -Project-ID 405553726 -TRR 270 for funding
Предметные рубрики: MAX PHASE
Аннотация: The magnetic properties of M2AX (M = Mn, Fe; A = Al, Ga, Si, Ge; X = C, N) phases were studied within DFT-GGA. The magnetic electronic ground state is determined. The investigation of the phase stability of M2AX phases is performed by comparing the total energy of MAX phases to that of the set of competitive phases for calculation of the phase formation enthalpy. As the result of such an approach, we have found one stable compound (Mn2GaC), and seven metastable ones. It is shown that several metastable MAX phases (Mn2AlC, Fe2GaC, Mn2GeC, and Mn2GeN) become stable at a small applied pressure (1.5–7 GPa). The mechanical, electronic and elastic properties of metastable MAX phases are studied.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Boldyrev K. N., Burlakov V. M., Gudim I. A., Gavrilkin S. Y., Popova M. N.
Заглавие : Regulation of the phase transition temperature and hysteresis width by changing the composition of solid solution
Место публикации : Phys. Rev. Mater. - 2021. - Vol. 5, Is. 9. - Ст.094414. - ISSN 24759953 (ISSN), DOI 10.1103/PhysRevMaterials.5.094414
Примечания : Cited References: 52. - This work is supported by the Russian Science Foundation under Grant No. 19-12-00413
Аннотация: A detailed study of the structural phase transition in Eu1–xLaxFe3(BO3)4 mixed crystals as a function of composition is reported. By analyzing a frequency shift of an electronic f-f transition in high-resolution optical spectra of Eu3+ ions, we detected a decrease in the phase transition temperature Ts from 87.05 to 12.2 K (upon cooling) and a simultaneous increase in thermal hysteresis ΔTs from 0.29 to 4.7 K with increasing x from x=0 to x=0.12. A rectangular hysteresis loop was observed. The experimental Ts(x) and ΔTs(x) dependences are described within the developed analytical model utilizing linear decrease in Ts with x and treating the increase in ΔTs in terms of the impurity-related decrease in the interaction between some local order parameters. We argue that R1−xR′xFe3(BO3)4 solid solutions, where R and R′ are different rare-earth elements, can be used to implement optical storage devices and switches operating at any chosen temperature between 0 and 450 K. It is found that the changes in the composition and, correspondingly, structural phase transition parameters do not affect the magnetic phase transformation. Eu0.88La0.12Fe3(BO3)4 demonstrates the structural phase transition at about 12 K, well below the Néel temperature TN=32K.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Denisova E. A., Chekanova L. A., Komogortsev S. V., Iskhakov R. S.
Заглавие : Magnetic properties of 3-d metal rods with gradients of composition produced by electroless deposition
Коллективы : Trends in MAGnetism Conference
Место публикации : Trends in MAGnetism (TMAG2020). - 2021
Примечания :
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Moshkina E. M., Krylov A. S., Kokh D., Shabanova K., Molokeev M. S., Bovina A. F., Plyaskin M., Rostovtsev N., Bezmaternykh L. N.
Заглавие : Multicomponent flux growth and composition control of Cu2MnBO5:Ga ludwigites
Место публикации : CrystEngComm. - 2022. - Vol. 24, Is. 19. - P.3565-3575. - ISSN 14668033 (ISSN), DOI 10.1039/d2ce00258b
Примечания : Cited References: 26. - This study was supported by the Russian Science Foundation (Grant No. 21-72-00130). The Raman, X-ray, and EDX data were obtained using the analytical equipment of the Krasnoyarsk Regional Center of Research Equipment of the Federal Research Center “Krasnoyarsk Science Center SB RAS”
Аннотация: To reach the concentration phase boundary between antiferromagnetic Cu2GaBO5 and ferrimagnetic Cu2MnBO5 ludwigites, solid solutions Cu2Mn1−xGaxBO5 (x = 0.05, 0.1, 0.15, 0.175) were grown by the flux technique using a multi-component solvent based on Bi2Mo3O12 with the addition of Na2B4O7 which significantly influenced the crystal formation and cation composition of the studied compounds. The content of the flux system was corrected taking into account the earlier established relationship of the partition coefficients of Mn2O3 and Ga2O3. The influence of the solvent components on the ludwigite crystallization was analyzed. The maximum size of the grown crystal was 1 × 1 × 4 mm3. The structure and cation composition of the grown compounds were studied using X-ray (X-ray diffraction, EDX (energy-dispersive X-ray spectroscopy)) and vibrational (Raman) spectroscopy techniques. The phase boundary of Cu2MnBO5–Cu2GaBO5 was found to be in the concentration range of x = 0.15–0.175, corresponding to a change in the monoclinic axis direction and a leap in the lattice parameters. The symmetry evolution of metal–oxygen octahedra for four nonequivalent cation positions was analyzed, and the unique crystal structure of Cu2MnBO5 demonstrated high rigidity relative to the introduction of Ga3+ cations. The polarized Raman spectra of monoclinic ludwigites were obtained and studied for the first time. A comparison of the spectra of the studied samples in both phases and orthorhombic ludwigites was made. A number of spectral features due to the monoclinic distortions in the crystal were found. In agreement with the Raman experiment, the concentration phase boundary was close to 0.15.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Denisova E. A., Chekanova L. A., Komogortsev S. V., Satsuk S. A., Nemtsev I. V., Iskhakov R. S., Semenov S. V.
Заглавие : Magnetic properties of three-dimensional metal rods with composition gradients produced by electroless deposition
Место публикации : IEEE Magn. Lett. - 2022. - Vol. 13. - Ст.6103405. - ISSN 1949307X (ISSN), DOI 10.1109/LMAG.2022.3163015
Примечания : Cited References: 30. - This work was supported in part by the Russian Foundation for Basic Research (RFBR), Krasnoyarsk Territory and in part by the Krasnoyarsk Regional Fund of Science under Grant 20-43-240003. The authors thank the Center of Collective Use of the Federal Research Center Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences for the equipment. Sergey V. Komogortsev thank the RFBR, Krasnoyarsk Region and the Krasnoyarsk Regional Science Foundation (Project 20-42-240001) for the support in the contribution of numerical simulation. The authors also thank V. S. Plotnikov and V. V. Tkachev for electron microscopy images
Аннотация: A comparative study of the magnetic properties of arrays of Co–Ni rods with different composition gradients (smooth or step-like) along the rod axes was carried out. Ordered arrays of Co–Ni nanorods with diameters up to 400 nm and 8 µm length were prepared by electroless plating into a porous nuclear-track-etched polycarbonate membrane. The gradient in Co and Ni composition was confirmed by energy-dispersive X-ray analysis. The variation of Co–Ni contents along the long axis of the rods correlates with the gradient of the magnetization within the rod. Magnetization reversal was studied by analyzing the angular dependence of coercivity and using micromagnetic simulations. For both types of gradient rods, reversal occurs by curling. The local magnetic anisotropy field of rods with a step-type gradient is significantly higher than that for rods with a smooth gradient.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gordienko, A., I, Malikov A. G., Volochaev M. N., Panyukhina A. D.
Заглавие : Influence of chemical composition and thermomechanical treatment of low-carbon steels on the microstructure and mechanical properties of their laser welded joints
Коллективы : [FWRW-2021-0009]; [121030900259-0]
Место публикации : Mater. Sci. Eng. A. - 2022. - Vol. 839. - Ст.142845. - ISSN 0921-5093, DOI 10.1016/j.msea.2022.142845. - ISSN 1873-4936(eISSN)
Примечания : Cited References: 38. - Microstructural studies and mechanical tests of laser welds were performed according to the Government research assignment for ISPMS SB RAS, project FWRW-2021-0009. Part of the research related to the selection of optimal laser welding parameters for low carbon steels was carried out within Basic State Project No. 121030900259-0
Предметные рубрики: AUSTENITE GRAIN-SIZE
HEAT-AFFECTED ZONE
MARTENSITE START TEMPERATURE
Аннотация: The paper reports microstructures (revealed by transmission electron microscopy) in various zones of laser welds of the X70 and X80 low-carbon steels with different initial microstructures, as well as chemical and phase compositions. In the X70 steels with 0.13% C, the microstructure refinement has been achieved through helical rolling at temperatures of 920 °C and 850 °C (designated as X70-920 and X70-850, respectively). For all studied cases, both initial steel microstructures and phase compositions have determined the formation of different microstructures with various microhardness levels in the weld metal and heat-affected zones. For the X70-850 steel with a more dispersed and homogeneous microstructure (dF = 3.3 μm), a lower microhardness level of 340 HV has been observed in the weld metal, compared with the X70-920 one (dF = 5.5 μm, 370 HV). The reason has been the formation of both bainite and martensite laths in the X70-850 weld metal, while only lath and lamellar martensite has formed in the X70-920 one. For the X80 steel (0.55% C), lowering the carbon content and additional microalloying with chromium, molybdenum and nickel have enabled to decrease the microhardness level down to 295 HV in the weld metal due to the degenerate upper bainite formation and the carbon level reduction in martensite. The dispersed and homogeneous initial microstructures of the X70-850 and X80 steels has provided the formation of granular ferrite-bainite microstructures in the intercritical heat-affected zone. They have possessed a lower proportion of residual austenite regions and small sizes of twinned martensite areas. The welded X80 steel specimen has been characterized by higher ductile properties compared to both X70 ones.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sorokin P. B., Avramov P.V., Yakobson B.I., Chernozatonskii L.A.
Заглавие : Magnesium Boride Nanotubes: Relative Stability and Atomic and Electronic Structure
Место публикации : J. Phys. Chem. C. - 2010. - Vol. 114, Is. 11. - P.4852-4856. - MAR 25. - ISSN 1932-7447, DOI 10.1021/jp9112014
Примечания : Cited Reference Count: 38. - Гранты: P.B.S. and B.I.Y. acknowledge support by the Basic Energy Sciences division of the Department of Energy, award DE-SC0001479. L.A.C. was supported by the Russian Academy of Sciences, program No. 21. P.V.A ad P.B.S. also acknowledge the collaborative RFBR-JSPS grant No. 09-02-92107-R Phi. We are grateful to the Joint Supercomputer Center of the Russian Academy of Sciences for the possibility of using a cluster computer for quantum chemical calculations. The geometry of all presented structures was visualized by commercial ChemCraft software (http://www.chemcraftprog.com).Финансирующая организация: Basic Energy Sciences division of the Department of Energy [DE-SC0001479]; Russian Academy of Sciences [21]; RFBR-JSPS [09-02-92107-RPhi]
Предметные рубрики: BORON
PSEUDOPOTENTIALS
FULLERENES
SIMULATION
FORM
Ключевые слова (''Своб.индексиров.''): basic composition--bending behavior--comparative studies--diborides--energy analysis--energy minima--magnesium atom--magnesium boride--mgb2--relative stabilities--semiconducting behavior--small-diameter--staggered configuration--sub-lattices--bending (forming)--borides--boron--electronic properties--electronic structure--energy management--magnesium--nanotubes--density functional theory
Аннотация: A comparative study of file energies and the electronic structure of MgBx nanotubes is performed within the framework of the density functional theory. Different basic compositions (x = 2 for diboride and x = 3 for triboride) and different diameters (3 angstrom D 18 angstrom), as well the exterior, interior, and staggered placement of magnesium atoms, are considered. Energy analysis reveals a nontrivial bending behavior of the MgB2 sheets. such that the tubes with exterior and staggered configurations display the energy minima at certain small diameters (of the boron cage sublattice). The semiconducting behavior of narrow MgB2 nanotubes with exterior Mg position was observed.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zhila N. O., Sapozhnikova K. Yu., Kiselev E. G., Vasiliev A. D., Nemtsev I. V., Shishatskaya E. I., Volova T. G.
Заглавие : Properties of degradable polyhydroxyalkanoates (PHAs) synthesized by a new strain, Cupriavidus necator IBP/SFU-1, from various carbon sources
Место публикации : Polymers. - 2021. - Vol. 13, Is. 18. - Ст.3142. - ISSN 20734360 (ISSN), DOI 10.3390/polym13183142
Примечания : Cited References: 78. - This work was financially supported by Project “Agropreparations of the new generation: a strategy of construction and realization” (Agreement No 075-15-2021-626) in accordance with Resolution No 220 of the Government of the Russian Federation of 9 April 2010, “On measures designed to attract leading scientists to the Russian institutions of higher learning” (strain isolation, polymer synthesis and investigation), and by the State Assignment of the Ministry of Science and Higher Education of the Russian Federation No. FSRZ-2020-0006 (study of film properties)
Аннотация: The bacterial strain isolated from soil was identified as Cupriavidus necator IBP/SFU-1 and investigated as a PHA producer. The strain was found to be able to grow and synthesize PHAs under autotrophic conditions and showed a broad organotrophic potential towards different carbon sources: sugars, glycerol, fatty acids, and plant oils. The highest cell concentrations (7–8 g/L) and PHA contents were produced from oleic acid (78%), fructose, glucose, and palm oil (over 80%). The type of the carbon source influenced the PHA chemical composition and properties: when grown on oleic acid, the strain synthesized the P(3HB-co-3HV) copolymer; on plant oils, the P(3HB-co-3HV-co-3HHx) terpolymer, and on the other substrates, the P(3HB) homopolymer. The type of the carbon source influenced molecular-weight properties of PHAs: P(3HB) synthesized under autotrophic growth conditions, from CO2, had the highest number-average (290 ± 15 kDa) and weight-average (850 ± 25 kDa) molecular weights and the lowest polydispersity (2.9 ± 0.2); polymers synthesized from organic carbon sources showed increased polydispersity and reduced molecular weight. The carbon source was not found to affect the degree of crystallinity and thermal properties of the PHAs. The type of the carbon source determined not only PHA composition and molecular weight but also surface microstructure and porosity of the polymer films. The new strain can be recommended as a promising P(3HB) producer from palm oil, oleic acid, and sugars (fructose and glucose) and as a producer of P(3HB-co-3HV) from oleic acid and P(3HB-co-3HV-co-3HHx) from palm oil.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Карпов И. В., Ушаков А. В., Лепешев, Анатолий Александрович, Дёмин В. Г., Федоров Л. Ю., Гончарова Е. А., Зеер Г. М., Жарков, Сергей Михайлович, Абкарян А. К.
Заглавие : Исследование микроструктурных особенностей, фазового состава и магнитных свойств композитов на основе YBCO и добавок несверхпроводящего компонента СuО, полученного в плазме дугового разряда низкого давления
Место публикации : Материаловедение. - 2020. - № 6. - С. 27-32. - ISSN 1684-579X, DOI 10.31044/1684-579X-2020-0-6-27-32
Примечания : Библиогр.: 12
Аннотация: Разработан метод, позволяющий формировать на поверхности дисперсных частиц порошка ВТСП-керамики несверхпроводящего покрытия, состоящего из самоорганизующихся кристаллов CuO, размеры которых менее длины когерентности, т.е. в пределах нескольких десятков нанометров. Показано, что сочетание самоорганизующихся структур в виде «усов» и наночастиц, появляющихся в результате совместного спекания порошков YBa2Cu3O7-x и электродуговых нанопорошков CuO, приводит к существенному увеличению плотности тока и появлению пик-эффекта в области сильных магнитных полей. Очень высокая плотность тока возникает из сложного пиннинга вихрей, где дефекты в виде «усов» обеспечивают большую энергию пиннинга, а наночастицы подавляют крип потока. Регулирование морфологии подобных структур возможно простым изменением концентрации нанодисперсных добавок. Показано, что наиболее оптимальной является добавка CuO в количестве 20% (мас.).A method has been developed, that allows one to form a non-superconducting coating on the surface of dispersed particles of an HTSC ceramic powder consisting of self-organizing CuO crystals whose sizes are less than the coherence length, i.e. within a few tens of nanometers. It was found out that the combination of self-organizing structures in the form of «whiskers» and nanoparticles resulting from the joint sintering of YBa2Cu3O7-x powders and CuO nanocrystals led to a significant increase in current density and the appearance of a peak effect in the region of strong magnetic fields. A very high current density arises from complex pinning of vortices, where defects in the form of «whiskers» provide a large pinning energy, and nanoparticles suppress creep flux. Morphology of such structures can be regulated by a simple change in the concentration of nanodispersed additives. It was determined that the addition of CuO in an amount of 20 wt.% was the most optimal.
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