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Optical thermometer based on efficient near-infrared dual-emission of Cr3+ and Ni2+ in magnetoplumbite structure / Qianqian Zhang, Guogang Li, Guangzhi Li [et al.] // Adv. Optical Mater. - 2024. - Vol. 12, Is. 1. - Ст. 2301429, DOI 10.1002/adom.202301429. - Cited References: 22. - This work was financially supported by the National Science and Technology Major Project (2022YFB3503800), the Projects for Science and Technology Development Plan of Jilin Province (20210402046GH), the National Natural Science Foundation of China (NSFC No. 51932009, 51720105015, 51929201, 52072349, 52172166), the Natural Science Foundation of Zhejiang Province (LR22E020004), and the Project funded by China Postdoctoral Science Foundation (2022TQ0365). M.S. Molokeev acknowledges the support by the Ministry of Science and Higher Education of Russian Federation (Project No. FSRZ-2023-0006) . - ISSN 2195-1071
Кл.слова (ненормированные):
energy transfers -- NIR dual emissions -- NIR-LED -- optical temperature sensing
Аннотация: Recently, an optical thermometer based on the dual-emitting fluorescent intensity ratio (FIR) in the visible light (VIS) region has achieved great development. However, there is very little progress in thermometers from NIR light. In this work, a novel optical thermometer based on highly efficient NIR dual-emission of Cr3+ and Ni2+ in LaZnGa11O19 (LZG) with a magnetoplumbite structure is designed. Utilizing energy transfer from Cr3+ to Ni2+, the dual-emission shows a wide coverage in the 650–1600 nm region, covering the NIR I and II windows, respectively. The as-reported LZG:0.3Cr3+ and LZG:0.3Cr3+,0.01Ni2+ phosphors can reach internal/external quantum efficiency (IQE/EQE) of 94%/64% and 77%/53%, respectively. The electroluminescence property and potential applications in spectroscopic analysis, night-vision, and bioimaging of fabricated NIR-LED with LZG:0.3Cr3+,0.01Ni2+ have also been investigated. In addition, the designed ratiometric optical thermometer responds to wide temperature ranges (100-175 K, 200–475 K) and shows a maximum relative sensitivity value (Sr) of 2.4% K−1 at 475 K. The optical performance of absorption in the red region and emission in the NIR region enables the LZG:0.3Cr3+,0.01Ni2+ to become a candidate for NIR optical thermometers in biotechnological applications.

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Держатели документа:
State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei2 30026, China
Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan4 30074, China
Zhejiang Institute, China University of Geosciences, Hangzhou 311305, China
College of Pharmacy, Jiamusi University, Jiamusi, Heilongjiang 154007, P. R. China
International Research Center of Spectroscopy and Quantum Chemistry—IRCSQC, Siberian Federal University, Krasnoyarsk 660041, Russia

Доп.точки доступа:
Zhang, Qianqian; Li, Guogang; Li, Guangzhi; Liu, Dongjie; Dang, Peipei; Qiu, Lei; Lian, Hongzhou; Molokeev, M. S.; Молокеев, Максим Сергеевич; Lin, Jun
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Features of the course of the solid-state reactions in a Sn/Fe/Cu trilayer film system / Yu. Yu. Balashov, V. G. Myagkov, L. E. Bykova [et al.] // Tech. Phys. - 2023. - Vol. 68, Is. 7. - P. 940-944, DOI 10.61011/TP.2023.07.56642.73-23. - Cited References: 18 . - ISSN 1063-7842. - ISSN 1090-6525
Кл.слова (ненормированные):
thin films -- transmission electron microscopy -- energy dispersion spectroscopy -- mass transfer mechanisms
Аннотация: Study of the mechanisms of the solid-state reactions in Sn/Fe/Cu thin films is interesting both from a fundamental point of view and from a view of the importance of emerging intermetallics in the technology of solder joints and thin-film lithium-ion batteries. By the integrated approach, including both X-ray phase analysis and local elemental analysis of the cross-sections of the films, the phase composition and the mutual arrangement of phases were studied, at various stages of the solid-state reaction occurring at different temperatures. The observed sequence of the appearing phases differs significantly from the expected one if the mass transfer took place by a volume diffusion through the forming layers.

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Публикация на русском языке Особенности протекания твердофазных реакций в трехслойной пленочной системе Sn/Fe/Cu [Текст] / Ю. Ю. Балашов, В. Г. Мягков, Л. Е. Быкова [и др.]. - 5 с. // Журн. техн. физ. - 2023. - Т. 93 Вып. 7. - С. 1009-1013

Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB, Russian Academy of Sciences, Krasnoyarsk, Russia
Siberian State University, Krasnoyarsk, Russia

Доп.точки доступа:
Balashov, Yu. Yu.; Балашов, Юрий Юрьевич; Myagkov, V. G.; Мягков, Виктор Григорьевич; Bykova, L. E.; Быкова, Людмила Евгеньевна; Volochaev, M. N.; Волочаев, Михаил Николаевич; Zhigalov, V. S.; Жигалов, Виктор Степанович; Matsynin, A. A.; Мацынин, Алексей Александрович; Galushka, K. A.; Bondarenko, G. N.; Бондаренко, Галина Николаевна; Komogortsev, S. V.; Комогорцев, Сергей Викторович; Nanophysics & Nanoelectronics, International Symposium(27 ; 13-16 March 2023 ; Nizhny Novgorod, Russia)
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    Luminescent studies of flexible [DUT-8 (Zn)] metal-organic frameworks / N. V. Slyusarenko, A. S. Krylov, M. V. Timofeeva [et al.] // Proc. SPIE. - 2023. - Vol. 12920: XVI International Conference on Pulsed Lasers and Laser Applications (10-15 September 2023, Tomsk, Russian Federation). - Ст. 1292014, DOI 10.1117/12.3005774. - Cited References: 10. - The reported study was funded by RFBR and DFG, project 21-52-12018
   Перевод заглавия: Изучение люминесценции гибкого DUT-8 (Zn) металлоорганического каркасного соединения
Кл.слова (ненормированные):
Förster resonance energy transfer -- FRET -- DUT-8 (Zn) -- metal-organic frameworks -- dye -- energy transfer -- efficiency -- steady-state luminescence -- time-resolved luminescence
Аннотация: An approach to the study of the porous structure of metal-organic frameworks (MOF) using guest luminescent molecules with specially selected spectral characteristics as acceptors of electronic excitation energy was suggested. If such molecules are adsorbed in MOF pores with sizes comparable to the Förster radius, Förster resonance energy transfer (FRET) from photoexcited linkers occurs. In this case quenching of luminescence of the linker can serve as analytical signals indicating open pore structure of the MOF. The developed approach was demonstrated by the example of DUT-8(Zn) MOF and Coumarin 1 as guest molecules by time-resolved luminescence methods.

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Держатели документа:
Siberian Federal University, Svobodny Prospect 79, 660041, Krasnoyarsk, Russia
Kirensky Institute of Physics FRC KSC SB RAS, Academgorodok 50/38, 660036, Krasnoyarsk, Russia
ITMO University, School of Physics and Engineering, Kronverksky Prospekt 49, bldg. A, 197101, St. Petersburg, Russia

Доп.точки доступа:
Slyusarenko, N. V.; Krylov, A. S.; Крылов, Александр Сергеевич; Timofeeva, M. V.; Shipilovskikh, S. A.; Slyusareva, E. A.; International Conference on Pulsed Lasers and Laser Applications(16 ; 2023 : 10-15 Sept. ; Tomsk, Russian Federation)
}
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Effect of complexation with closo-decaborate anion on photophysical properties of copolyfluorenes containing dicyanophenanthrene units in the main chain / A. A. Yakimanskiy, K. I. Kaskevich, T. G. Chulkova [et al.] // Micro. - 2023. - Vol. 3, Is. 4. - P. 930-940, DOI 10.3390/micro3040063. - Cited References: 23. - This work was supported by the Russian Science Foundation, grant no. 23-43-00060 . - ISSN 2673-8023
Кл.слова (ненормированные):
CAM-B3LYP -- charge transfer -- copolyfluorene -- energy transfer -- hole-electron distribution -- nitrilium derivatives of closo-decaborate anions -- lambda-diagnostic -- luminescence -- phenanthrene-9,10-dicarbonitrile -- TD-DFT
Аннотация: The functionalization of copolyfluorenes containing dicyanophenanthrene units by closo-decaborate anion is described. Target copolyfluorenes were analyzed using SEM, UV-vis, luminescence, NMR, and Fourier-transform infrared (FTIR) spectroscopy. The effect of complexation with the closo-decaborate anion on the photophysical properties was studied both experimentally and theoretically. The PL data indicate an efficient charge transfer from fluorene to the dicyanophenanthrene units coordinated to the closo-decaborate. The coordination of closo-decaborate clusters to the nitrile groups of copolyfluorenes provides an important route to new materials for sensors and light-emitting devices while, at the same time, serving as a platform for further study of the nature of boron clusters.

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Держатели документа:
Institute of Macromolecular Compounds, RAS, Bolshoi Prospect of Vasilyevsky Island 31, Saint Petersburg 199004, Russia
Department of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russia
Kurnakov Institute of General and Inorganic Chemistry, RAS, Moscow 119991, Russia
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
Laboratory for Digital Controlled Drugs and Theranostics, Federal Research Center KSC SB RAS, Krasnoyarsk 660041, Russia

Доп.точки доступа:
Yakimanskiy, Anton A.; Kaskevich, Ksenia I.; Chulkova, Tatiana G.; Krasnopeeva, Elena L.; Savilov, Serguei V.; Voinova, Vera V.; Neumolotov, Nikolay K.; Zhdanov, Andrey P.; Rogova, Anastasia V.; Рогова, Анастасия Владимировна; Tomilin, F. N.; Томилин, Феликс Николаевич; Zhizhin, Konstantin Yu.; Yakimansky, Alexander V.
}
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Dynamics of asphaltene aggregates under high-pressure CO2 revealed by pulsed-field gradient NMR / E. V. Morozov, S. N. Trukhan, I. V. Kozhevnikov [et al.] // Energy & Fuels. - 2023. - Vol. 37, Is. 22. - P. 17215-17226, DOI 10.1021/acs.energyfuels.3c02862. - Cited References: 90. - The present research was performed with the financial support of the Russian Science Foundation (project no. 21-13-00171, http://rscf.ru/project/21-13-00171/) using the equipment of the Krasnoyarsk Regional Center of Research Equipment of the Federal Research Center “Krasnoyarsk Science Center SB RAS” . - ISSN 0887-0624. - ISSN 1520-5029
Аннотация: The work demonstrates the results of the first experimental PFG NMR study in situ of the complex phase behavior of asphaltenes in the presence of high-pressure CO2. To perform the experiments, a series of sealed, thick-walled quartz capillaries were prepared with a mixture of CO2 and asphaltenes dissolved either in chloroform or benzene at different initial concentrations. Then, the temperature dependence of the diffusion coefficients of the asphaltene aggregates was measured for each sample after the mixture reached its equilibrium state, at which, in accordance with the solubility limit, only part of the initial asphaltenes remained dissolved. Despite quite low residual asphaltene concentrations in solution, experimental data clearly demonstrated the presence of aggregated structures (up to 70–80 wt %) attributed solely to nanoaggregates, with no signs of the presence of macroaggregates in the samples. Temperature dependencies of aggregate diffusivity clearly showed that the scenario, according to which the evolution of the asphaltene aggregates will develop, strongly depends on the initial asphaltene concentration, mass fraction of CO2 loaded into the system, and chemical nature of the solvent used. In particular, the most diluted asphaltene solution, expected to be the most resistive to the aggregation processes in a high-pressure CO2 environment, revealed the most pronounced aggregation-dependent translational dynamics as compared to those with a moderate initial asphaltene concentration. Contrarily, the concentrated asphaltene solution may not show drastic aggregation processes if the mass fraction of the CO2 loaded will not appear to be so high. Finally, the experimental results provide evidence that the temperature-triggered structural transformation of asphaltene aggregates due to the noncovalent bond breakup is not hindered under high-pressure CO2, but instead becomes more emphasized. The results obtained shed new light on asphaltene aggregate dynamics and brought new knowledge about the fundamental behavior of asphaltene in high-pressure CO2 conditions.

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Держатели документа:
Institute of Chemistry and Chemical Technology, Federal Research Center “Krasnoyarsk Science Center of Siberian Branch of the Russian Academy of Sciences”, Akademgorodok 50/24, Krasnoyarsk 660036, Russia
Kirensky Institute of Physics, Federal Research Center “Krasnoyarsk Science Center of Siberian Branch of the Russian Academy of Sciences”, Akademgorodok 50/38, Krasnoyarsk 660036, Russia
Federal Research Center “Krasnoyarsk Science Center of Siberian Branch of the Russian Academy of Sciences”, Akademgorodok 50, Krasnoyarsk 660036, Russia
Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, Ak. Lavrentieva 5, Novosibirsk 630090, Russia

Доп.точки доступа:
Morozov, E. V.; Морозов, Евгений Владимирович; Trukhan, Sergey N.; Kozhevnikov, Ivan V.; Peterson, Ivan V.; Martyanov, Oleg N.
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Описание изобретения к патенту 2801388


    Устройство для передачи электрической энергии на промышленной частоте через проводящий экран / Н. М. Боев, С. Д. Крёков, И. В. Подшивалов [и др.]. - № 2022129187 ; Заявл. 10.11.2022 ; Опубл. 08.08.2023 // Изобретения. Полезные модели : офиц. бюл. Фед. службы по интеллектуал. собственности (Роспатент). - 2023. - № 22
   Перевод заглавия: Device for transmitting electrical energy at industrial frequency through conductive screen
Аннотация: Изобретение относится к области электротехники, предназначено для беспроводной передачи электромагнитной энергии через проводящие экраны на промышленной частоте и может быть использовано в беспроводных зарядных устройствах, в системах энергоснабжения устройств, находящихся в частично или полностью замкнутых металлических экранах. Устройство для передачи электрической энергии на промышленной частоте через проводящий экран включает передатчик электрической энергии с передающей катушкой, приемник электрической энергии с приемной катушкой, новым является то, что между передающей и приемной катушками расположен проводящий электрический ток экран, толщина которого меньше глубины скин-слоя в нем для заданной рабочей частоты, параллельно передающей и приемной катушкам подключены конденсаторы, при этомкатушки и конденсаторы образуют связанные колебательные контуры, а передача электрической энергии осуществляется на одной из резонансных частот, на которой разница междуфазами токов, текущих в приемной и передающей катушках, находится в диапазоне от 160° до 180°. Техническим результатом является обеспечение возможности передачи электрической энергии на промышленной частоте (50/60 Гц) через проводящий электрический ток экран. 17 ил.

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Держатели документа:
Институт физики им. Л. В. Киренского СО РАН

Доп.точки доступа:
Боев, Никита Михайлович; Boev, N. M.; Крёков, Сергей Дмитриевич; Подшивалов, Иван Валерьевич; Podshivalov, I. V.; Соловьев, Платон Николаевич; Solovev, P. N.; Изотов, Андрей Викторович; Izotov, A. V.; Негодеева, Ирина Александровна; Александровский, Александр Сергеевич; Aleksandrovsky, A. S.; Федеральный исследовательский центр "Красноярский научный центр Сибирского отделения Российской академии наук"; Федеральная служба по интеллектуальной собственности (Роспатент); Федеральный институт промышленной собственности
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Novel Janus 2D structures of XMoY (X, Y = O, S, Se, Te) composition for solar hydrogen production / E. V. Sukhanova, N. Sagatov, A. S. Oreshonkov [и др.] // Int. J. Hydrog. Energy. - 2023. - Vol. 48, Is. 38. - P. 14226-14237, DOI 10.1016/j.ijhydene.2022.12.286. - Cited References: 97. - The authors acknowledge financial support from Russian Science Foundation (№ 21-73-20183). The authors are grateful to the Joint Supercomputer Center of the Russian Academy of Sciences and to the Information Technology Centre of Novosibirsk State University for providing access to the cluster computational resources . - ISSN 0360-3199. - ISSN 1879-3487
Кл.слова (ненормированные):
Photocatalytic water splitting -- Novel materials -- Transition metal dichalcogenides -- H2 generation
Аннотация: The successful fabrication of H-phase Janus transition metal dichalcogenides (TMDs) has received considerable interest due to its great potential in photocatalytic applications. Here, new A′-XMoY (X/Y = O, S, Se, Te) Janus-type structures belonging to the family of TMDs were theoretically investigated for the first time in terms of photocatalytic water splitting via DFT calculations. For all compounds, the Raman spectra were calculated. The SMoO, SeMoO, SMoSe, SMoTe and SeMoTe compounds are dynamically stable and are semiconductors. Among all considered structures SMoTe is the most promising candidate for solar hydrogen production because valence and conduction bands perfectly engulf the redox potentials of water at both neutral and acidic media, opposite to SMoSe, SMoO, SeMoO suitable only in the acidic media, and SeMoTe – in the neutral media. Moreover, A′-SMoTe demonstrates the outstanding values of the solar-to-hydrogen (STH) conversion efficiencies of 54.0 and 67.1 for neutral and acidic media.

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Держатели документа:
Emanuel Institute of Biochemical Physics of Russian Academy of Sciences, 119334 Moscow, Russia
Sobolev Institute of Geology and Mineralogy, Siberian Branch of Russian Academy of Sciences, prosp. acad. Koptyuga 3, 630090 Novosibirsk, Russia
Laboratory of Molecular Spectroscopy, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 660036 Krasnoyarsk, Russia
School of Engineering and Construction, Siberian Federal University, 660041 Krasnoyarsk, Russia
Novosibirsk State University, Pirogova 2, 630090 Novosibirsk, Russia

Доп.точки доступа:
Sukhanova, E.V.; Sagatov, N.; Oreshonkov, A. S.; Орешонков, Александр Сергеевич; Gavryushkin, P.N.; Popov, Z.I.
}
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    Thermokinetic study of aluminum-induced crystallization of a-Si: The effect of Al layer thickness / S. M. Zharkov, V. V. Yumashev, E. T. Moiseenko [et al.] // Nanomaterials. - 2023. - Vol. 13, Is. 22. - Ст. 2925, DOI 10.3390/nano13222925. - Cited References: 70. - This work was supported by the Russian Science Foundation under grant #22-13-00313 . - ISSN 2079-4991
   Перевод заглавия: Термокинетическое исследование кристаллизации a-Si, индуцированной алюминием: влияние толщины слоя Al
Кл.слова (ненормированные):
amorphous silicon -- Al/Si -- nanolayer -- multilayer film -- metal-induced crystallization -- aluminum-induced crystallization -- kinetics -- activation energy -- enthalpy -- simultaneous thermal analysis (STA)
Аннотация: The effect of the aluminum layer on the kinetics and mechanism of aluminum-induced crystallization (AIC) of amorphous silicon (a-Si) in (Al/a-Si)n multilayered films was studied using a complex of in situ methods (simultaneous thermal analysis, transmission electron microscopy, electron diffraction, and four-point probe resistance measurement) and ex situ methods (X-ray diffraction and optical microscopy). An increase in the thickness of the aluminum layer from 10 to 80 nm was found to result in a decrease in the value of the apparent activation energy Ea of silicon crystallization from 137 to 117 kJ/mol (as estimated by the Kissinger method) as well as an increase in the crystallization heat from 12.3 to 16.0 kJ/(mol Si). The detailed kinetic analysis showed that the change in the thickness of an individual Al layer could lead to a qualitative change in the mechanism of aluminum-induced silicon crystallization: with the thickness of Al ≤ 20 nm. The process followed two parallel routes described by the n-th order reaction equation with autocatalysis (Cn-X) and the Avrami–Erofeev equation (An): with an increase in the thickness of Al ≥ 40 nm, the process occurred in two consecutive steps. The first one can be described by the n-th order reaction equation with autocatalysis (Cn-X), and the second one can be described by the n-th order reaction equation (Fn). The change in the mechanism of amorphous silicon crystallization was assumed to be due to the influence of the degree of Al defects at the initial state on the kinetics of the crystallization process.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
Laboratory of Electron Microscopy, Siberian Federal University, Krasnoyarsk 660041, Russia
Institute of Chemistry and Chemical Technology, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Zharkov, S. M.; Жарков, Сергей Михайлович; Yumashev, V. V.; Moiseenko, E. T.; Altunin, R. R.; Solovyov, L. A.; Volochaev, M. N.; Волочаев, Михаил Николаевич; Zeer, G. M.; Nikolaeva, N. S.; Belousov, O. V.
}
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Anisotropic thermal expansion and electronic transitions in the Co3BO5 ludwigite / N. Kazak, A. Arauzo, J. Bartolome [et al.] // Dalton Trans. - 2022. - Vol. 51, Is. 16. - P6345-6357, DOI 10.1039/d2dt00270a. - Cited References: 57. - We are grateful to the Russian Foundation for Basic Research (project no. 20-02-00559 and 21-52-12033) for supporting this paper. This work was performed within the framework of the budget project no. 0287-2021-0013 for the Institute of Chemistry and Chemical Technology SB RAS. We acknowledge the financial support from the Spanish Ministry of Economy, Industry and Competitiviness (MINECO), (Grant No. MAT2017-83468-R) and from the regional Government of Aragón (E12-20R RASMIA project) . - ISSN 1477-9226
Кл.слова (ненормированные):
Activation energy -- Anisotropy -- Cobalt compounds -- Crystal structure -- Electric conductivity -- Electronic properties -- Magnetic moments -- Magnetic susceptibility -- Negative thermal expansion
Аннотация: The investigations of the crystal structure, magnetic and electronic properties of Co3BO5 at high temperatures were carried out using powder X-ray diffraction, magnetic susceptibility, electrical resistivity, and thermopower measurements. The orthorhombic symmetry (Sp.gr. Pbam) was observed at 300 K and no evidence of structural phase transitions was found up to 1000 K. The compound shows a strong anisotropy of the thermal expansion. A large negative thermal expansion along the a-axis is observed over a wide temperature range (T = 300–600 K) with αa = −35 M K−1 at T = 500 K with simultaneous expansion along the b- and c-axes with αb = 70 M K−1 and αc = 110 M K−1, respectively. The mechanisms of thermal expansion are explored by structural analysis. The activation energy of the conductivity decreases significantly above 700 K. Electronic transport was found to be a dominant conduction mechanism in the entire temperature range. The correlations between the thermal expansion, electrical resistivity, and effective magnetic moment were revealed and attributed to the evolution of the spin state of Co3+ ions towards the spin crossover and gradual charge-ordering transition.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Instituto de Nanociencia y Materiales de Aragon (INMA), CSIC-Universidad de Zaragoza and Departamento de Fisica de la Materia Condensada, Zaragoza, 50009, Spain
Servicio de Medidas Fisicas, Universidad de Zaragoza, Zaragoza, 50009, Spain
Research and Development Department, Kemerovo State University, Kemerovo, 650000, Russian Federation
Institute of Chemistry and Chemical Technology, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Kazak, N. V.; Казак, Наталья Валерьевна; Arauzo, A.; Bartolome, J.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Dudnikov, V. A.; Дудников, Вячеслав Анатольевич; Solovyov, L.; Borus, A.; Борус, Андрей Андреевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
}
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10.

    Synthesis and characterization of nanoscale composite particles formed by 2D layers of Cu-Fe sulfide and Mg-based hydroxide / Y. L. Mikhlin, R. V. Borisov, S. A. Vorobyev [et al.] // J. Mater. Chem. A. - 2022. - Vol. 10, Is. 17. - P. 9621-9634, DOI 10.1039/d2ta00877g. - Cited References: 84. - This research was supported by the Russian Foundation for Basic Research, Krasnoyarsk Territory Administration and Krasnoyarsk Territory Science Foundation, project 20-43-242903. Facilities of the Krasnoyarsk Regional Center of Research Equipment of Federal Research Center “Krasnoyarsk Science Center SB RAS” were employed in the work . - ISSN 2050-7488
   Перевод заглавия: Синтез и исследование наноразмерных композитных частиц, образованных двумерными слоями сульфида Cu-Fe и гидроксида на основе Mg
Кл.слова (ненормированные):
Binary alloys -- Copper compounds -- Electron energy levels -- Electron energy loss spectroscopy -- Electron scattering -- Light absorption -- Light scattering -- Magnesium compounds -- Near infrared spectroscopy -- Paramagnetism -- Sols -- Sulfur compounds -- X-ray photoelectron spectroscopy
Аннотация: We introduce here a multifunctional material composed of alternating atomic sulfide sheets close to the composition of CuFeS2 and Mg-based hydroxide ones (valleriite), which are assembled due to their electric charges of opposite sign. Valleriite particles 50-200 nm in lateral size and 10-20 nm in thickness were synthesized via a simple hydrothermal pathway using various concentrations of precursors and dopants, and examined with XRD, TEM, EDS, X-ray photoelectron spectroscopy, reflection electron energy loss spectroscopy (REELS), Mossbauer, Raman and UV-vis-NIR spectroscopies, and magnetization, dynamic light scattering, and zeta potential measurements. The electronic, magnetic and optical characteristics are found to be critically dependent on the charge (electron density) at the narrow-gap sulfide layers containing Cu+ and Fe3+ cations, and can be tuned via the composition of the hydroxide part. Particularly, substitution of Mg2+ with Al3+ increases the negative charge of the hydroxide layers and reduces the content of Fe3+-OH centers (10-45% of total iron); the effects of Cr and Co dopants entering both layers are more complicated. Mossbauer doublets of paramagnetic Fe3+ detected at room temperature transform into several Zeeman sextets at 4.2 K; the hyperfine fields up to 500 kOe and complex magnetic behavior, but not pure paramagnetism or antiferromagnetism, were observed for valleriites with the higher positive charge of the sulfide sheets, probably due to the depopulation of the minority-spin 3d states of S-bonded Fe3+ ions. Aqueous colloids of valleriite show optical absorption at 500-750 nm, which, along with the peaks at the same energies in REELS, may arise due to quasi-static dielectric resonance involving the vacant Fe 3d band and being dependent on the composition of both layers too. These and other findings call attention to valleriites as a new rich family of 2D materials for a variety of potential applications.

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Держатели документа:
Institute of Chemistry and Chemical Technology, Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of sciences, Akademgorodok, 50/24, Krasnoyarsk, 660036, Russian Federation
Kirensky Institute of Physics, Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of sciences, Akademgorodok 50/38, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Svobodny av. 79, Krasnoyarsk, 660041, Russian Federation
Federal Research Center “Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of sciences”, Akademgorodok, 50, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Mikhlin, Y. L.; Borisov, R. V.; Vorobyev, S. A.; Tomashevich, Y. V.; Romanchenko, A. S.; Likhatski, M. N.; Karacharov, A. A.; Bayukov, O. A.; Баюков, Олег Артемьевич; Knyazev, Yu. V.; Князев, Юрий Владимирович; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Zharkov, S. M.; Жарков, Сергей Михайлович; Krylov, A. S.; Крылов, Александр Сергеевич; Krylova, S. N.; Крылова, Светлана Николаевна; Nemtsev, I. V.; Немцев, Иван Васильевич
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