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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Ovchinnikov S. G., Gavrichkov V. A., Shneyder E. I., Korshunov M. M.
Заглавие : Normal and superconducting properties of cuprates in strong electron correlation regime
Коллективы : "Фундаментальные проблемы высокотемпературной сверхпроводимости", международная конференция
Место публикации : Третья международная конференция "Фундаментальные проблемы высокотемпературной сверхпроводимости" ФПС'08: 13-17 окт., Звенигород, 2008 : сборник трудов. - С. 10
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Ovchinnikov S. G., Shneyder E. I.
Заглавие : The interplay of phonon and magnetic mechanism of pairing in strongly correlated electron system of high-Tc cuprates
Коллективы : International Conference on New Theoreties, Discoveries & Applications of Superconductors and Related Materials, Zhongguancun International Consortium of R&D of Superconductivity Technology Inaugurating Meeting
Место публикации : Seventh International Conference on New Theoreties, Discoveries & Applications of Superconductors and Related Materials and Zhongguancun International Consortium of R&D of Superconductivity Technology Inaugurating Meeting: May 13-16, 2009, Beijing, China. - Ст.S1E0900
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Shapovalov V. V., Shapovalov V. A., Drokina T. V., Vorotynov A. M., Val'kov V. I.
Заглавие : Distribution of cobalt Co2+ ions in single crystals of spinel Li0.5Ga2.5O4
Колич.характеристики :6 с
Место публикации : Phys. Met. Metallogr. - 2024. - Vol. 125, Is. 1. - P.27-32. - ISSN 0031918X (ISSN), DOI 10.1134/S0031918X23602883. - ISSN 15556190 (eISSN)
Примечания : Cited References: 22
Аннотация: The distribution of Co2+ ions over sublattices and structurally nonequivalent positions in the unit cell of the crystal lattice of a single crystal of lithium gallium spinel Li0.5Ga2.5O4 is shown. This distribution determines the properties of both mono- and nanocrystalline substances. The distribution is obtained by a special technology and is manifested in the electron paramagnetic resonance (EPR) spectra. The distribution of Co2+ ions depends on the structural and magnetic nonequivalence. The structural and magnetic nonequivalence causes a multiminimum behavior of the crystal field potential in the unit cells of single crystals at the locations of Co2+ ions. The Co2+ ions are found in complexes with tetrahedral and octahedral oxygen ions. Three types of EPR spectra of Co2+ ions have been found and investigated. The Cotetr2+ spectrum is attributed to the Co2+ ion, which replaces the Ga3+ ion located in a tetrahedral oxygen environment. The spectrum of the Cooct2+ ion located in the crystal field with axial symmetry belongs to the Co2+ ion replacing the Li+ ion located in an octahedral oxygen environment. The spectrum of the Cooct2+ ion located in a low symmetry crystal field belongs to the Co2+ ion replacing the Ga3+ ion located in an octahedral oxygen environment. The nearest cationic environment of the ion creates rhombic distortions due to the different valence numbers of Li+ and Ga3+. The results of studying the angular dependences of the spectra show the presence of four and twelve magnetically nonequivalent positions in the unit cells.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vorobyev S. A., Flerko M. Yu., Novikova S. A., Mazurova E. V., Tomashevich Ye. V., Likhatski M. N., Saikova S. V., Samoilo A. S., Zolotovsky N. A., Volochaev M. N.
Заглавие : Synthesis and study of superhigh-concentrated organosols of silver nanoparticles
Колич.характеристики :10 с
Место публикации : Colloid J. - 2024. - Vol. 86, Is. 2. - P.208-217. - ISSN 1061933X (ISSN), DOI 10.1134/S1061933X23601294. - ISSN 16083067 (eISSN)
Примечания : Cited References: 33. - The work was carried out with the financial support of the basic project FWES-2021-0014 of the Institute of Chemistry and Chemical Technology, Siberian Branch, Russian Academy of Sciences, and the Federal Program "Priority 2030" using the equipment of the Krasnoyarsk regional center for collective use of the Federal Research Center Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences
Аннотация: Due to their unique properties, organosols of silver nanoparticles are widely used in optical and semiconductor devices, to produce electrically and thermally conductive films, as catalysts, antibacterial materials, etc. This work proposes a simple and highly productive method for the preparation of silver organosols, which have a metal concentration as high as 1800 g/L and contain spherical nanoparticles with low polydispersity and a median size of 9.1 nm. The method consists in the initial preparation of silver nanoparticle hydrosols with a concentration of higher than 30 g/L followed by the transfer of the NPs into an organic phase of o-xylene. A set of physical research methods has been employed to study the regularities of the extraction of silver nanoparticles with o-xylene in the presence of cetyltrimethylammonium bromide (CTAB) and ethanol and to determine the optimal process conditions, under which the extraction degree is as high as 62.5%. It has been found that bromine anions contained in CTAB molecules cause the aggregation of some amount of silver nanoparticles with the formation of silver metal sediment in the aqueous phase. According to X-ray photoelectron spectroscopy data, the sediment contains bromide ions (up to 4 at %) on the particle surface. Organosols synthesized under optimal conditions are stable for more than 7 months and withstand repeated cycles of drying and redispersing. Silver organosols have been used to obtain metal films with an electrical conductivity of about 68 500 S/cm, which increases to 412 000 and 509 500 S/cm (87.8% of the electrical conductivity of bulk silver) after thermal treatment at 150 and 250°C, respectively.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Karacharov A. A., Likhatski M. N., Borisov R. V., Tomashevich E. V., Vorobyev S. A., Zharkov S. M.
Заглавие : Modification of synthetic valleriite surface with gold nanoparticles: The roles of specific adsorption and zeta potential
Колич.характеристики :12 с
Место публикации : Colloid J. - 2024. - Vol. 86, Is. 1. - P.40-51. - ISSN 1061933X (ISSN), DOI 10.1134/S1061933X23601075. - ISSN 16083067 (eISSN)
Примечания : Cited References: 69. - This work was supported by the Russian Science Foundation project no. 22-13-00321
Аннотация: Layered two-dimensional materials, whose properties dramatically differ from their bulk precursors, are of great theoretical and applied importance. Recently, a layered 2D material, an analog of a natural mineral, valleriite, in which quasi-monoatomic Cu−Fe−S sheets alternate with brucite-like ones, has been prepared using a simple hydrothermal synthesis procedure. The features of the electronic structure of these materials make it possible to propose them as new materials for a wide field of applications such as (electro)photocatalysis, high-capacity batteries, etc. In this work, nanocomposite materials have been prepared via immobilization of gold nanoparticles (AuNPs) from citrate hydrosols on the surface of the synthesized valleriites having different compositions of hydroxide layers, which control the surface charge density. According to X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), energy-dispersive X-ray microanalysis (EDX), and selected area electron diffraction (SAED) data, AuNPs are immobilized on valleriite nanoflakes, which have lateral sizes of 150–200 nm and thicknesses of several tens of nanometers, as isolated metal nanoparticles with an average diameter of 11 nm. A small amount of aggregates indicates a high affinity of AuNPs for the valleriite surface. The amounts of immobilized gold are the same on all studied valleriites (~0.2%). This finding may be related to the simultaneous sorption of free citrate ions from the AuNP hydrosols, with these ions, according to zeta potential measurements, charging the surfaces of all studied valleriite samples to nearly the same negative value of –40 mV. According to the XPS data, the AuNPs immobilization markedly decreases the magnesium and oxygen contents on the surfaces of the synthesized valleriites due to the partial degradation/dissolution of the brucite layer. In addition, the amount of Fe3+ ions bound to OH groups decreases with a simultaneous increase in the fraction of Fe3+–O species. The TEM data have confirmed the preservation of the layered structure of valleriites after the immobilization of AuNPs.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zhou G., Wang Y., Mao Y., Guo C., Zhang J., Molokeev M. S., Xia Z., Zhang X.-M.
Заглавие : Temperature/component-dependent luminescence in lead-free hybrid metal halides for temperature sensor and anti-counterfeiting
Колич.характеристики :9 с
Место публикации : Adv. Funct. Mater. - 2024. - Ст.2401860. - Article in press. - ISSN 1616301X (ISSN), DOI 10.1002/adfm.202401860. - ISSN 16163028 (eISSN)
Примечания : Cited References: 89. - G.J.Z. and Y.T.W. contributed equally to this work. This work was supported by the National Natural Science Foundation of China (No.52202177, 22271211), Fundamental Research Program of Shanxi Province (No.20210302124054), Science and Technology Innovation Project of Colleges and Universities in Shanxi Province (No.2021L262), 1331 Project of Shanxi Province, Postgraduate Innovation Project of Shanxi Province (No.2023KY462), and supported by the Ministry of Science and High Education of Russian Federation (No.FSRZ-2023-0006). The authors would like to thank Prof. Haijun Jiao, Leibniz-Institut für Katalyse e.V., Germany, for the theoretical support on the electron-transition mechanism
Аннотация: Hybrid metal halides (HMHs) have emerged as a promising platform for optically functional crystalline materials, but it is extremely challenging to thoroughly elucidate the electron transition coupled to additional ligand emission. Herein, to discover sequences of lead-free HMHs with distinct optically active metal cations are aimed, that is, Sb3+ (5s2) with the lone-pair electron configuration and In3+ (4d10) with the fully-filled electron configuration. (Me2NH2)4MCl6·Cl (Me = −CH3, M = Sb, In) exhibits the superior temperature/component-dependent luminescence behaviors resulting from the competition transition between triplet-states (Tn-S0) self-trapped excitons (STEs) of inorganic units and singlet-state (S1-S0) of organic cations, which is manipulated by the optical activity levels of [SbCl6]3− and [InCl6]3−. The bonding differences between Sb3+/In3+ and Cl− in terms of electronic excitation and hybridization are emphasized, and the different electron-transition mechanisms are established according to the PL spectra at the extreme temperature of 5 to 305 K and theoretical calculations. By fine-tuning the B-site Sb3+/In3+ alloying, the photoluminescence quantum yield (PLQY = 81.5%) and stability are optimized at 20% alloying of Sb3+. This research sheds light on the rules governing PL behaviors of HMHs, as well as exploring the optical-functional application of aviation temperature sensors and access-control systems.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Altunin R. R., Moiseenko E. T., Zharkov S. M.
Заглавие : Kinetics of diffusion and phase formation in a solid-state reaction in Al/Au thin films
Колич.характеристики :10 с
Место публикации : J. Alloys Compd. - 2024. - Vol. 1002. - Ст.175500. - ISSN 09258388 (ISSN), DOI 10.1016/j.jallcom.2024.175500. - ISSN 18734669 (eISSN)
Примечания : Cited References: 83. - This work was supported by the Russian Science Foundation (grant # 22-13-00313)
Аннотация: The kinetics of diffusion and formation of Al-Au intermetallic compounds in a solid-state reaction between layers of aluminum and gold has been studied by the method of in situ electron diffraction. The phase sequence in the solid-state reaction in Al/Au thin films is found to depend on the atomic ratio of aluminum and gold at the initial state. Specifically, with the atomic ratio being Al:Au=2:1, one observes the formation sequence: Al3Au8→AlAu2→Al2Au, while with the ratio Al:Au=1:4, the sequence is Al3Au8→AlAu4. The observed change in the sequence is explained using the theoretical model of EHF (Effective Heat of Formation). The kinetic parameters of the diffusion of gold through the layer of reaction products in the Al/Au thin films have been determined, including the apparent activation energy of the diffusion Ea=1.17 eV and pre-exponential factor D0=120 cm2/s. Based on the data obtained by in situ electron diffraction, the kinetic parameters of the phase formation have been estimated by the Kissinger-Akahira-Sunose method. In addition, the kinetic parameters of the formation of the Al-Au intermetallic compounds have been determined (apparent activation energy Ea, pre-exponential factor A) in the solid-state reaction in the Al/Au thin films, namely, Ea = 0.77 eV, log(A, s−1) = 9 for Al3Au8; Ea = 1.08 eV, log(A, s−1) = 13 for AlAu2; Ea = 1.13 eV, log(A, s−1) = 13 for Al2Au; and Ea = 1.35 eV, log(A, s−1) = 16 for the phase AlAu4. The kinetic parameters of the formation of the AlAu4 phase have been estimated for the first time.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Konov Yu. V., Pykhtin D. A., Bikbaev R. G., Timofeev I. V.
Заглавие : Tamm plasmon polariton-based planar hot-electron photodetector for the near-infrared region
Место публикации : Nanoscale. - 2024. - Vol. 16, Is. 19. - P.9570-9575. - ISSN 20403364 (ISSN), DOI 10.1039/D4NR00710G. - ISSN 20403372 (eISSN)
Примечания : Cited References: 36
Аннотация: Light-trapping devices have always been a topic of intense interest among researchers. One such device that has gained attention is the hot-electron photodetector with a tunable detection wavelength. Photodetectors based on plasmon nanostructures that provide excitation of surface plasmon polaritons are challenging to manufacture. To address this issue, a planar hot-electron photodetector based on a Tamm plasmon polariton localized in a metal–semiconductor-multilayer mirror structure has been proposed in this study. The parameters and materials of the structure were adjusted to ensure perfect absorption at the resonance wavelength. As a result, the photoresponsivity of the proposed device can reach 42.6 mA W−1 at 905 nm. For the first time, the photosensitivity was calculated analytically by solving the dispersion law for the Tamm plasmon polariton.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Буханов, Евгений Романович, Шефер А. Д., Шабанов, Александр Васильевич, Гуревич Ю. Л., Крахалев, Михаил Николаевич
Заглавие : Строение, оптические и спектральные характеристики эпикутикулярного воска хвои ели голубой
Колич.характеристики :10 с
Место публикации : Сибирский лесной журнал. - 2024. - № 1. - С. 97-106. - ISSN 23111410 (ISSN), DOI 10.15372/SJFS20240111. - ISSN 23122099 (eISSN)
Примечания : Библиогр.: 33
Аннотация: Предложен метод по отделению чистых пластин эпикутикулярного воска. Использование воды, способной глубоко проникать в восковые структуры под действием сил Ван-дер-Ваальса и расширяться при замерзании, позволяет быстро получить незагрязненные восковые пластины с нативной структурой без каких-либо сторонних химических примесей. С помощью сканирующей электронной микроскопии были получены снимки воска хвои голубой ели (Picea pungens Engelm.). Определены его морфологические и структурные характеристики. Отличительной особенностью является наличие восковых нанотрубочек с характерными диаметром ~150 нм и длиной 3–5 мкм. Нанотрубочки лежат друг на друге стопками, образуя одномерную длиннопериодическую решетку. Проведены микроскопические наблюдения воска, сделанные в отраженном и прошедшем свете. Показано, что покрытие хвои голубой ели состоит из микрочастичек воска, обладающие структурным окрасом. В широком спектральном диапазоне отдельные частички изменяют цвет от синего до красного, как следствие, большие конгломераты частичек имеют белый цвет. Получены спектры флуоресценции хвои с нативным восковым покровом и той же самой хвои после удаления воска. При сравнении ширины линий флуоресценции на полувысоте хвоинки голубой ели с воском и без, выявлено влияние воскового слоя на время жизни возбужденных электронов в фотосистеме II, тем самым установлена связь между восковым покровом и процессом фотосинтеза. Методом трансфер матриц выполнены расчеты спектров пропускания для решетки схожей с восковой структурой, хлоропластом и сочетанием восковой структуры с хлоропластом. В последнем варианте длинноволновая зона селективного отражения значительно шире, чем у отдельных случаев. При рассмотрении структуры, содержащей хлоропласт и эпикутикулярный воск, наблюдается небольшое расщепление стоп-зоны, как при наличии дефекта, что способствует высокой концентрации энергии в месте расщепления. Вследствии роста концентрации энергии увеличивается плотность фотонных состояний на соответствующих длинах волн. Этот эффект важен для фотосинтеза, поскольку согласно золотому правилу Ферми, скорость реакции пропорциональна плотности фотонных состояний. Результаты расчетов находятся в хорошем согласии с экспериментальными спектрами.A method for separating clean plates of epicuticular wax has been proposed. The use of water, which can penetrate deeply into wax structures under the influence of van der Waals forces and expand upon freezing, allows to quickly obtain uncontaminated wax plates with a native structure without any third-party chemical impurities. Using scanning electron microscopy, images of blue spruce ( Picea pungens Engelm.) needle wax were obtained. Its morphological and structural characteristics have been determined. A distinctive feature is the presence of wax nanotubules with a characteristic diameter of ~150 nm and a length of 3-5 μm. Nanotubes lie on top of each other in stacks, forming a one-dimensional long-period lattice. Microscopic observations of the wax were made in reflected and transmitted light. It has been shown that the coating of blue spruce needles consists of microparticles of wax with a structural color. In a wide spectral range, individual particles change color from blue to red, as a result, large conglomerates of particles are white. Fluorescence spectra of needles with native wax cover and the same needles after wax removal were obtained. When comparing the width of fluorescence lines at half-height of blue spruce needles with and without wax, the influence of the wax layer on the lifetime of excited electrons in photosystem II was revealed, thereby establishing a connection between the wax cover and the process of photosynthesis. Using the matrix transfer method, transmission spectra were calculated for a lattice similar to a waxy structure, a chloroplast, and a combination of a waxy structure with a chloroplast. In the latter version, the long-wave zone of selective reflection is much wider than in individual cases. When examining a structure containing a chloroplast and epicuticular wax, there is a slight splitting of the stop zone, as if there were a defect, which contributes to a high concentration of energy at the site of splitting. Due to an increase in energy concentration, the density of photonic states at the corresponding wavelengths increases. This effect is important for photosynthesis because, according to Fermi’s golden rule, the rate of reaction is proportional to the density of photonic states. The calculation results are in good agreement with the experimental spectra.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Orlov Yu. S., Nikolaev S. V., Ovchinnikov S. G.
Заглавие : Photoinduced Enhancement of the Excitonic Order in Strongly Correlated Electron Systems with the Spin Crossover
Колич.характеристики :9 с
Место публикации : JETP Lett. - 2023. - Vol. 117, Is. 12. - P.923-931. - ISSN 00213640 (ISSN), DOI 10.1134/S0021364023601513. - ISSN 10906487 (eISSN)
Примечания : Cited References: 40. - This work was supported jointly by the Russian Science Foundation and the Krasnoyarsk Regional Science Foundation (project no. 22-22-20007)
Аннотация: A new mechanism of the photoinduced enhancement of the excitonic order in strongly correlated electron systems with the spin crossover through the generation of a massive mode in the spectrum of collective excitations is demonstrated.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Orlov Yu. S., Nikolaev S. V., Tegai S.Ph., Paklin N.N., Ovchinnikov S. G.
Заглавие : Magnetic transitions and excitonic order enhancement in spin crossover strongly correlated electron systems
Колич.характеристики :10 с
Место публикации : Mater. Today Commun. - 2023. - Vol. 37. - Ст.107191. - ISSN 23524928 (eISSN), DOI 10.1016/j.mtcomm.2023.107191
Примечания : Cited References: 53. - The study was supported by the Russian Science Foundation grant No. 22-22-20007, Krasnoyarsk Regional Science Foundation
Аннотация: The effects of exciton Bose condensation in strongly correlated spin crossover systems are considered within the effective Hamiltonian obtained from the two-orbital Hubbard–Kanamori model. The spectrum of collective excitations at various points of the temperature-crystal field phase diagram is calculated. The role of the electron–phonon interaction is discussed. A novel mechanism of excitonic and related magnetic order photoenhancement in strongly correlated spin crossover systems based on the massive collective phase mode appearance is demonstrated. In addition, we have shown that exciton and associated with it magnetic ordering can be photoinduced outside the exciton condensate phase due to the gap presence in the spectrum of single excitations.
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Udod L. V., Aplesnin S. S., Sitnikov M. N., Eremin E. V., Molokeev M. S., Shabanov A. V., Romanova O. B., Kharkov A. M.
Заглавие : Structural and magnetic transitions in the Bi2Fe4O9/BiFeO3 composite
Место публикации : J. Alloys Compd. - 2023. - Vol. 958. - Ст.170445. - ISSN 09258388 (ISSN), DOI 10.1016/j.jallcom.2023.170445. - ISSN 18734669 (eISSN)
Примечания : Cited References: 51
Аннотация: A Bi2Fe4O9/BiFeO3 composite with a percentage ratio of 67/33 has been synthesized, its morphological analysis has been carried out. The average crystallite sizes for each phase have been determined. The magnetization hysteresis has been established and the temperature of its disappearance has been found. Using the infrared absorption spectra, temperatures of the magnetic phase transitions in each phase have been determined from the magnetic susceptibility, magnetostriction constant, ultrasound damping coefficient, and phonon mode softening. The change of magnetostriction constant sign observed in the vicinity of the spin reorientation transition and antiferromagnetic transition in mullite has been attributed to the change of the sign of the magnetoelastic constants. The interaction between the phases in the composite and the correlation of its structural and magnetic properties have been established.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Shabalina A. V., Anikeev S. G., Kulinich S. A., Artyukhova N. V., Vlasov V. A., Kaftaranova M. I., Hodorenko V. N., Yakovlev E. V., Pesterev E. A., Lukyanenko A. V., Volochaev M. N., Pakholkina S., Mamazakirov O., Stolyarov V. V., Mokshin A. V., Gunther V. E.
Заглавие : Combined porous-monolithic TiNi materials surface-modified with electron beam for new-generation rib endoprostheses
Место публикации : J. Funct. Biomater. - 2023. - Vol. 14, Is. 5. - Ст.277. - ISSN 20794983 (eISSN), DOI 10.3390/jfb14050277
Примечания : Cited References: 57. - The study was supported by the Russian Science Foundation (grant no. 19-79-10045). https://rscf.ru/project/19-79-10045/
Аннотация: TiNi alloys are very widely used materials in implant fabrication. When applied in rib replacement, they are required to be manufactured as combined porous-monolithic structures, ideally with a thin, porous part well-adhered to its monolithic substrate. Additionally, good biocompatibility, high corrosion resistance and mechanical durability are also highly demanded. So far, all these parameters have not been achieved in one material, which is why an active search in the field is still underway. In the present study, we prepared new porous-monolithic TiNi materials by sintering a TiNi powder (0–100 μm) on monolithic TiNi plates, followed by surface modification with a high-current pulsed electron beam. The obtained materials were evaluated by a set of surface and phase analysis methods, after which their corrosion resistance and biocompatibility (hemolysis, cytotoxicity, and cell viability) were evaluated. Finally, cell growth tests were conducted. In comparison with flat TiNi monoliths, the newly developed materials were found to have better corrosion resistance, also demonstrating good biocompatibility and potential for cell growth on their surface. Thus, the newly developed porous-on-monolith TiNi materials with different surface porosity and morphology showed promise as potential new-generation implants for use in rib endoprostheses.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Orlov Yu. S., Nikolaev S. V., Dudnikov V. A., Gavrichkov V. A., Ovchinnikov S. G.
Заглавие : Features of spin crossovers in magnetic materials
Колич.характеристики :26 с
Место публикации : Phys. Usp. - 2023. - Vol. 66, Is. 7. - P.647-672. - ISSN 10637869 (ISSN), DOI 10.3367/UFNe.2022.05.039195. - ISSN 14684780 (eISSN)
Примечания : Cited References: 237. - The authors thank the Russian Science Foundation for financial support in the framework of project no. 18-12-00022
Аннотация: We present experimental and theoetical results of spin crossover studies in magnetically ordered materials. The effect of spin crossovers on the electronic structure of transition metal oxides and on the Bose condensation of spin excitons in the vicinity of the spin crossover is considered. A new method for calculating the interatomic superexchange interaction in transition metal oxides is discussed that allows considering selective contributions of excited magnetic cation terms. Changes in the exchange interaction sign are predicted for spin crossovers for d5—d7 ions. In the RCoO3 family of rare-earth cobaltites, the ground state is nonmagnetic, but, as the temperature increases, thermal excitations of high-spin states give rise to a number of experimentally detectable features. In defective RCoO3 samples, stabilization of the high-spin term and ferromagnetic ordering are possible. Dynamical crossovers under external pumping and the dynamics of multiplicity, magnetization, and local lattice distortions are discussed. Geophysical implications of spin crossovers are considered, and metallic properties of Earth's mantle at a depth of 1400—1800 km are predicted.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Moiseenko E. T., Yumashev V. V., Altunin R. R., Solovyov L. A., Volochaev M. N., Belousov O. V., Zharkov S. M.
Заглавие : Thermokinetic study of intermetallic phase formation in an Al/Cu multilayer thin film system
Место публикации : Materialia. - 2023. - Vol. 28. - Ст.101747. - ISSN 25891529 (eISSN), DOI 10.1016/j.mtla.2023.101747
Примечания : Cited References: 53. - This work was supported by the Russian Science Foundation under grant # 22-13-00313
Аннотация: The solid-state reaction process in a multilayer thin film system (Al/Cu)50 has experimentally been studied using the methods of simultaneous thermal analysis (STA) and in situ electron diffraction. A detailed kinetic analysis of the phase formation processes during the solid-state reaction has shown that the observed solid-state transformations can be described by a statistically significant kinetic model where each stage corresponds to the reaction of the n-th order with autocatalysis. The low-temperature stage has been demonstrated to be attributable to the formation of the θ-Al2Cu phase, with the medium-temperature and high-temperature ones corresponding to the α2-AlCu3 and γ1-Al4Cu9 phases, respectively. The kinetic parameters for the formation of the phases θ-Al2Cu, α2-AlCu3 and γ1-Al4Cu9 have been determined. It has been shown that the kinetic model describing the solid-state reaction in the Al–Cu multilayer thin film system is in best agreement with the experimental data in the case of a competition between the formation stages of the α2-AlCu3 and γ1-Al4Cu9 phases.
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16.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Andryushchenko T. A., Lyashchenko S. A., Varnakov S. N., Ovchinnikov S. G., Shvetsov D. V., Yakovlev I. A.
Заглавие : Electron charge accumulation by island surfaces of Cr-Mn based MAX phase thin films on MgO
Коллективы : International Baltic Conference on Magnetism, Балтийский федеральный университет им. И. Канта
Место публикации : V International Baltic Conference on Magnetism. IBCM: Book of abstracts. - 2023. - P.129
Примечания : Cited References: 2. - РФН № 21-12-00226
Материалы конференции,
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kuzmenko A. M., Ivanov V. Yu., Tikhanovsky A. Yu., Pimenov A. G., Shuvaev A. M., Gudim I. A., Mukhin A. A.
Заглавие : Terahertz spectroscopy of magnetoelectric HoAl3(BO3)4
Колич.характеристики :6 с
Место публикации : Opt. Spectrosc. - 2023. - Vol. 131, Is. 6. - P.409-414. - ISSN 0030400X (ISSN), DOI 10.1134/S0030400X23020121. - ISSN 15626911 (eISSN)
Примечания : Cited References: 18. - This study was partially financially supported by the Russian Science Foundation (project 16-12-10531)
Аннотация: Experimental and theoretical study of submillimeter (terahertz) spectroscopic and magnetic properties of the rare-earth aluminum borate HoAl3(BO3)4 were performed at temperatures 3–300K. In the transmittance spectra a number of resonance lines were detected at frequencies 2–35 cm–1 for different radiation polarizations. These modes were identified as transitions between the lower levels of the ground multiplet of the Ho3+ ion split by the crystal field, including both transitions from the ground state to the excited ones and transitions between the excited states. The established excitation conditions of the observed modes and the simulation of the spectra made it possible to separate the magnetic and electric dipole transitions and to determine the energies of the corresponding states, their symmetry, and the matrix elements of the transitions. Low-frequency lines that do not fit into the established picture of the electron states of Ho3+ were also found; these lines, apparently, correspond to the ions with the distorted by defects local symmetry of the crystal field.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Habibullayev N. N., Naumov N. G., Lavrov A.N., Kuratieva N. V., Aleksandrovsky A. S., Oreshonkov A. S., Molokeev M. S., Palamarchuk I. V., Yurev I. O., Denisenko Y. G., Andreev O. V., Zakharova A. D.
Заглавие : Magnetic, optical, and thermic properties of SrLnCuSe3 (Ln = Dy, Ho, Er, Tm) compounds
Место публикации : Magnetochemistry. - 2023. - Vol. 9, Is. 8. - Ст.194. - ISSN 23127481 (eISSN), DOI 10.3390/magnetochemistry9080194
Примечания : Cited References: 36. - The study was funded by the Russian Science Foundation, project No. 23-23-00488
Аннотация: SrLnCuSe3 (Ln = Dy, Ho, Er, Tm) compounds crystallize in the Pnma and Cmcm orthorhombic space group and belong to the Eu2CuS3 and KCuZrS3 structural type, respectively. According to a single-crystal XRD study, the SrTmCuSe3 unit cell parameters are a = 4.0631 (4), b = 13.4544 (14), c = 10.4430 (10) A, and V = 570.88 (10) A3. All the studied SrLnCuSe3 samples in the temperature range of 1.77–300 K demonstrate paramagnetic behavior without any features pointing to magnetic ordering. The measured Curie constants coincide with the values expected for Ln3+ ions with good accuracy, which confirms the stoichiometric composition of the samples and the non-magnetic state of the copper ions, Cu1+ (S = 0). The conducted optical absorption study showed that the polycrystalline SrLnCuSe3 (Ln = Dy, Ho, Er, Tm) samples are semiconductors with a direct bandgap ranging from 2.14 eV to 2.31 eV. Two indirect bandgaps were revealed and explained by the presence of optical transitions to highly dispersive subbands in the conduction band. The compounds demonstrate two reversible phase transitions α⇆β, β⇆γ and an incongruent melting at 1606 K (Dy), 1584 K (Ho), 1634 K (Er), and 1620 K (Tm) associated with the formation of solid solutions of SrSe, Cu2-XSe, and Ln2Se3 binary compounds.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Slyusarenko N. V., Yushina I. D., Slyusareva E. A., Golovkina E. V., Krylova S. N., Vtyurin A. N., Krylov A. S.
Заглавие : Determination of the pore direction in a crystalline metal-organic framework by Raman spectroscopy and periodic calculations based on the electron density functional theory
Колич.характеристики :10 с
Место публикации : Optoelectron. Instrum. Data Process. - 2023. - Vol. 59, Is. 6. - P.693-702. - ISSN 87566990 (ISSN), DOI 10.3103/S8756699023060134. - ISSN 19347944 (eISSN)
Примечания : Cited References: 32. - This work was supported by the Russian Foundation for Basic Research (Russian Center of Scientific Information), project no. 21-52-12018We are grateful to Dr. Irena Senkovska for the presented DUT-8 (Ni, Co) samples
Аннотация: A method for the determination of pore orientation in metal-organic framework structures by polarized Raman spectra is proposed. The method involves sensitivity of the line intensity of Raman scattering to the geometry of propagation in a crystal. The operability of the method is shown by DUT-8 (Ni, Co) crystals. The obtained results are interpreted based on analysis of symmetry and direction of vibrations within periodic calculations of the electron density functional theory. The simultaneous approach allowed us to describe the vibrations and to find the principal crystal orientation collinear to the pore direction. The information on the pore orientation is necessary for problems of adsorption and design of complex multicomponent materials based on metal-organic framework.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Andryushchenko T. A., Lyashchenko S. A., Varnakov S. N., Lukyanenko A. V., Nemtsev I. V., Yakovlev I. A., Shevtsov D. V., Maximova O. A., Ovchinnikov S. G.
Заглавие : Auger electron spectroscopy of thin Cr2GeC films
Колич.характеристики :7 с
Место публикации : Phys. Met. Metallogr. - 2023. - Vol. 124, Is. 14. - P.1776-1782. - ISSN 0031918X (ISSN), DOI 10.1134/S0031918X2360135X. - ISSN 15556190 (eISSN)
Примечания : Cited References: 33. - The research was supported by the Russian Science Foundation (grant no. 21-12-00226, http://rscf.ru/project/21-12-00226/)
Аннотация: Auger electron spectroscopy was used to determine the phase composition of Cr2GeC MAX phase thin films. A distinctive feature of the formation of carbon-containing MAX phases is the shape of carbon Auger peaks, which is characteristic of metal carbides spectra. Features of the Auger spectra in the presence of secondary phases of chromium germanides are found. Their presence can manifest itself in an increase in the energy of the germanium peaks, which is caused by a chemical shift during the formation of the Cr–Ge bond. Moreover, we have detected the accumulation of electronic charge, which can be explained by the features of the surface morphology.
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