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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Koblischka, Michael R., Koblischka-Veneva, Anjela, Gokhfeld D. M., Naik, S. Pavan Kumar, Nouailhetas, Quentin, Berger, Kevin, Douine, Bruno
Заглавие : Flux pinning docking interfaces in satellites using superconducting foams as trapped field magnets
Коллективы : ANRFrench National Research Agency (ANR); DFGGerman Research Foundation (DFG)European Commission [ANR-17-CE05-0030, DFG-ANR Ko2323-10]
Место публикации : IEEE Trans. Appl. Supercond. - 2022. - Vol. 32, Is. 4. - Ст.4900105. - ISSN 1051-8223, DOI 10.1109/TASC.2022.3147734. - ISSN 1558-2515(eISSN)
Примечания : Cited References: 44. - This work was supported in part by SUPERFOAM international project funded by ANR and DFG under Grants ANR-17-CE05-0030 and DFG-ANR Ko2323-10.
Предметные рубрики: BULK
RECONFIGURATION
MAGNETIZATION
Аннотация: Flux-Pinning Docking Interfaces (FPDI) in satellite systems were developed using bulk superconductors and permanent magnets in previous works. However, such FPDIs have limited magnetic field strength, consist of heavy-weight material, and can only be used with a single purpose, i.e., as chasing or docking satellite. Replacing the magnetic material in the FPDI by a trapped field (TF)-magnet would enable the interface to operate for both purposes, i.e., generating a (stronger) magnetic field and trapping it. We show the requirements for such a system and discuss the possible gains when using a TF-FPDI in satellites. To reduce the system weight, the use of superconducting foams as superconducting material is discussed in detail. Furthermore, the use of superconducting foams, the size of which can be easily upscaled, may also comprise the function of the damping material, so even more weight could be saved for the payload.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Shtarev, Dmitry S., Shtareva, Anna, V, Kevorkyants, Ruslan, Molokeev M. S., Serpone, Nick
Заглавие : Revisiting the BaBiO3 semiconductor photocatalyst: synthesis, characterization, electronic structure, and photocatalytic activity
Коллективы : Russian Science FoundationRussian Science Foundation (RSF) [19-73-10013]
Место публикации : Photochem. Photobiol. Sci. - 2021. - Vol. 20, Is. 9. - P.1147-1160. - ISSN 1474-905X, DOI 10.1007/s43630-021-00086-y. - ISSN 1474-9092(eISSN)
Примечания : Cited References: 48. - We wish to thank the Russian Science Foundation for a Grant (Project No. 19-73-10013) in support of our study. The authors are also grateful to the staff of the following Institutes/Centers for their valuable technical assistance and in providing the needed equipment: (i) the Khabarovsk Innovation and Analytical Center of the Yu. A. Kosygin Institute of Tectonics and Geophysics FEB RAS; and (ii) the Resource Centers of the Research Park at Saint-Petersburg State University, especially the Center for Physical Methods of Surface Investigation and the Nanophotonics Center. One of us (NS) is grateful to the staff of the PhotoGreen Laboratory of the University of Pavia, Italy, for their continued hospitality
Предметные рубрики: RHODAMINE-B
OXIDE
DRIVEN
SUPERCONDUCTIVITY
PSEUDOPOTENTIALS
Аннотация: This article revisits the properties of BaBiO3 examined extensively in the last two decades because of its electronic properties as a superconductor and as a semiconductor photocatalyst. Solid-state syntheses of this bismuthate have often involved BaCO3 as the barium source, which may lead to the formation of BaBiO3/BaCO3 heterostructures that could have an impact on the electronic properties and, more importantly, on the photocatalytic activity of this bismuthate. Accordingly, we synthesized BaBiO3 by a solid-state route to avoid the use of a carbonate; it was characterized by XRD, SEM, and EDX, while elemental mapping characterized the composition and the morphology of the crystalline BaBiO3 and its thin films with respect to structure, optoelectronic, and photocatalytic properties. XPS, periodic DFT calculations, and electrochemical impedance spectroscopy ascertained the electronic and electrical properties, while Raman and DRS spectroscopies assessed the relevant optical properties. The photocatalytic activity was determined via the degradation of phenol in aqueous media. Although some results accorded with earlier studies, the newer electronic structural data on this bismuthate, together with the photocatalytic experiments carried out in the presence of selective radical trapping agents, led to elucidating some of the mechanistic details of the photocatalytic processes that previous views of the BaBiO3 band structure failed to address or clarify. Analytical refinement of the XRD data inferred the as-synthesized BaBiO3 adopted the C2/m symmetry rather than the I2/m structure reported earlier, while Tauc plots from DRS spectra yielded a bandgap of 2.05 eV versus the range of 1.1–2.25 eV reported by others; the corresponding flatband potentials were 1.61 eV (EVB) and − 0.44 eV (ECB). The photocatalytic activity of BaBiO3 was somewhat greater than that of the well-known Evonik P25 TiO2 photocatalyst under comparable experimental conditions.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Shtarev D. S., Shtareva, A., V, Kevorkyants R., Rudakova, A., V, Molokeev M. S., Bakiev, T., V, Bulanin K. M., Ryabchuk V. K., Serpone N.
Заглавие : Materials synthesis, characterization and DFT calculations of the visible-light-active perovskite-like barium bismuthate Ba1.264(4)Bi1.971(4)O4 photocatalyst
Коллективы : Russian Science FoundationRussian Science Foundation (RSF) [19-73-10013]; Saint-Petersburg State University [39054581]; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [18-03-00855]
Место публикации : J. Mater. Chem. C. - 2020. - Vol. 8, Is. 10. - P.3509-3519. - ISSN 2050-7526, DOI 10.1039/c9tc06457e. - ISSN 2050-7534(eISSN)
Примечания : Cited References: 42. - The current research was kindly funded by a grant from the Russian Science Foundation (project No. 19-73-10013). R. K., A. V. R., V. K. R. and T. V. B. acknowledge financial support from Saint-Petersburg State University (Pure ID 39054581). A. V. R. thanks the Russian Foundation for Basic Research for a Grant No. 18-03-00855 that supported studies into the photoinduced hydrophilicity of the bismuthate. The authors are further grateful to the staff of the Khabarovsk Innovation and Analytical Center of the Yu. A. Kosygin Institute of Tectonics and Geophysics of the Far Eastern Branch of the Russian Academy of Sciences, and the Resource Centers of the Research Park at the Saint-Petersburg State University: (i) the Center for Diagnostics of Functional Materials for Medicine, Pharmacology and Nanoelectronics, (ii) the Center for Physical Methods of Surface Investigation, (iii) the Center for Optical and Laser Materials Research, and the laboratories of (iv) Nanotechnology and (v) Nanophotonics for their valuable assistance in carrying out the research and in providing the needed equipment. One of us (N.S.) is grateful to Prof. Angelo Albini and the staff of the PhotoGreen Laboratory at the University of Pavia, Italy, for their continued hospitality.
Предметные рубрики: OXIDE
NIO/SRBI2O4
SPECTRA
DRIVEN
CO2
LA
Аннотация: A perovskite-like barium bismuthate of the BaBi2O4 class, Ba1.264(4)Bi1.971(4)O4, has been prepared by solid-state synthesis and subsequently characterized by a number of experimental techniques (XPS, DRS, SEM, EDX and Raman spectroscopy), as well as by a DFT computational approach using the GGA Perdew–Burke–Ernzerhof (PBE) density functional to determine the energy band structure. XRD peaks were indexed to a rhombohedral cell (R[3 with combining macron]m) with parameters close to Ba0.156Bi0.844O1.422 (i.e., to Ba0.439Bi2.374O4), which upon Rietveld refinement gave Ba1.264(4)Bi1.971(4)O4. The Bi–O bond lengths determined from this refinement (1.86 and 2.31 Å) accorded with the bond lengths estimated from Raman spectra (1.97 and 2.26 Å). DFT calculations revealed the bismuthate to display two bandgaps that correspond to lower-energy indirect (2.28 eV) and to higher-energy direct (2.36 eV) electronic transitions in good agreement with the experimental bandgaps of 2.26 eV and 2.43 eV, respectively, from Tauc plots of DRS spectra. Relative to the indirect bandgap energy of 2.26 eV, the energies of the valence band and of the conduction band were, respectively, +1.14 eV and −1.12 eV. The photoactivity of Ba1.264(4)Bi1.971(4)O4 was examined toward the photoreduction of the greenhouse gas CO2 in aqueous media photoelectrochemically yielding alcohols and alkanes, while in the gas phase in an infrared cell reactor the products were carbon monoxide and alkanes.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pugachev A. M., Zaytseva, I., V, Malinovsky V. K., Surovtsev, N., V, Gorev M. V., Ivleva L. I., Lykov P. A.
Заглавие : Temperature dependence of the spontaneous polarization, acoustic and strain anomalies in strontium barium niobate crystals of different chemical compositions probed by the second harmonic generation technique
Коллективы : Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [18-02-00399, 19-42-543-016, AAAA-A17-117052410033-9]
Место публикации : Ferroelectrics. - 2020. - Vol. 560, Is. 1. - P.54-60. - ISSN 0015-0193, DOI 10.1080/00150193.2020.1722883. - ISSN 1563-5112(eISSN)
Примечания : Cited References: 19. - This work was supported by the Russian Foundation for Basic Research, projects no. 18-02-00399 and 19-42-543-016 and State assignment No AAAA-A17-117052410033-9.
Предметные рубрики: SINGLE-CRYSTALS
RELAXOR
GROWTH
Аннотация: In SrxBa1-xNb2O6 crystals (x = 0.33, 0.5, 0.61, and 0.75), temperature dependences of spontaneous polarization, strain, elastic modules, and second harmonic generation (SHG) signal are compared. It is revealed that SHG describes the temperature dependences of dipole moments in polar nanoregions in paraelectric phase. In the vicinity of the phase transition in paraelectric phase, SHG reflects the temperature behavior of relatively large and long-lived polar asymmetric regions as indicated by the presence of the intermediate temperature range on the temperature dependence of this nonlinear response.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zaytseva I. V., Pugachev A. M., Surovtsev N. V., Krylov A. S.
Заглавие : Features of Raman spectra in barium titanate pressed powder
Коллективы : SPM-2019-RCWDFM Joint International Conference (3rd International Conference "Scanning Probe Microscopy" (SPM), the 4th Russia-China Workshop on Dielectric and Ferroelectric Materials (RCWDFM), and International Youth Conference "Functional Imaging of Nanomaterials")
Место публикации : IOP Conf. Ser.: Mater. Sci. Eng. - 2019. - Vol. 699, Is. 1. - Ст.012058. - ISSN 1757-8981, DOI 10.1088/1757-899X/699/1/012058. - ISSN 1757-899X (eISSN)
Примечания : Cited References: 16. - The reported study was funded by RFBR according to the research projects No. 19-42-543-016 and 18-02-00399 and State assignment No AAAA-A17-117052410033-9. The experiments were performed in the multiple-access centre “High-Resolution Spectroscopy of Gases and Condensed Matter” in IA&E SBRAS (Novosibirsk, Russia) and Centre for Common Use of the Krasnoyarsk Scientific Centre, SBRAS (Krasnoyarsk, Russia).
Аннотация: Raman spectra in barium titanate powder under non-hydrostatic pressures are presented. The relationship between the pressure (up to 11 GPa) and the shift and the width of E(TO)-phonon line has been established. It has been found that under the action of uniaxial pressure a new Raman peak arises in the vicinity of 100 cm−1. It is shown that the Raman shift and width of both peaks increase depending on the applied pressure. These Raman lines broadening may be associated with an increase of the concentration of defect states in the volume of the sample.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Semenov S. V., Balaev D. A.
Заглавие : Temperature behavior of the magnetoresistance hysteresis in a granular high-temperature superconductor: Magnetic flux compression in the intergrain medium
Место публикации : Physica C. - 2018. - Vol. 550. - P.19-26. - ISSN 09214534 (ISSN), DOI 10.1016/j.physc.2018.04.005
Примечания : Cited References: 56. - The work was supported by the Russian Science Foundation (Grant No. 17-72-10050 ).
Ключевые слова (''Своб.индексиров.''): barium compounds--copper compounds--grain boundaries--hysteresis--magnetic flux--magnetic moments--magnetization--magnetoresistance--yttrium barium copper oxides
Аннотация: Granular high-temperature superconductors (HTSs) are characterized by the hysteretic behavior of magnetoresistance. This phenomenon is attributed to the effective field in the intergrain medium of a granular HTS. At the grain boundaries, which are, in fact, weak Josephson couplings, the dissipation is observed. The effective field in the intergrain medium is a superposition of the external field and the field induced by magnetic moments of HTS grains. Meanwhile, analysis of the field width of the R(H) magnetoresistance hysteresis ΔH = Hdec − Hinc at Hdec = const, where Hinc and Hdec are increasing and decreasing branches of the R(H) hysteretic dependence, shows that the effective field in the intergrain medium exceeds by far both the external field and the field induced by magnetic moments of HTS grains. This situation suggests the magnetic flux compression in the intergrain medium because of the small length of grain boundaries, which amounts to ∼1 nm, i.e., is comparable with the coherence length and corresponds to Josephson tunneling in HTS materials. In this work, using the previously developed approach, we examine experimental data on the magnetoresistance and magnetization hysteresis in the granular YBa2Cu3O7 HTS compound in the range from 77 K to the critical temperature. According to the results obtained, the degree of magnetic flux compression determined by the parameter α in the expression for the effective field Beff(H) = H − 4π M(H) α in the intergrain medium remains constant over the investigated temperature range. All the features of the observed evolution of the R(H) hysteretic dependences are explained well within the proposed approach when the expression for Beff(H) contains the experimental M(H) magnetization data and the parameter α of about 20–25. The latter is indicative of the dominant effect of magnetic flux compression in the intergrain medium on the transport properties of granular HTS materials.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Drokin N. A., Poluboyarov V. A.
Заглавие : Impedance spectroscopy study of the electrical properties of cation-substituted barium hexaaluminate ceramics
Место публикации : Phys. Solid State. - 2018. - Vol. 60, Is. 2. - P.274-280. - ISSN 1063-7834, DOI 10.1134/S1063783418020063. - ISSN 1090-6460(eISSN)
Примечания : Cited References:18
Предметные рубрики: DIELECTRIC-RELAXATION
LIQUID-CRYSTALS
SPECTRA
Аннотация: We report on the behavior of frequency and temperature dependences of the impedance of a measuring cell in the form of a parallel-plate capacitor filled with barium hexaaluminate ceramics with four aluminum cations replaced by iron (BaO · 2Fe2O3 · 4Al2O3). The measurements have been performed in the frequency range of 0.5–108 Hz at temperatures of 20-375°C. A technique for determining the electrical properties of the investigated ceramics is proposed, which is based on an equivalent electric circuit allowing the recorded impedance spectra to be approximated with sufficiently high accuracy. The established spectral features are indicative of the presence of two electric relaxation times different from each other by three orders of magnitude. This fact is explained by the difference between the charge transport processes in the bulk of crystallites and thin intercrystallite spacers, for which the charge activation energies have been determined.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ганженко, Игорь Михайлович, Якубайлик, Эдуард Константинович, Зарщикова Г. Г., Камалова Т. Б., Алексеева Л. А.
Заглавие : Снижение засоренности конечного концентрата на Абагурской обогатительной фабрике
Место публикации : Черная металлургия: Бюлл. науч.-тех. и экономич. информации : ЦНИИТЭИ черной металлургии, 2017. - № 3. - С. 39-44. - ISSN 0135-5910
Ключевые слова (''Своб.индексиров.''): обогатительная фабрика--мокрое обогащение--засоренность конечного концентрата--магнетитовое железо--магнитные системы сепараторов--феррит бария--неодим-железо-бор--напряженность магнитного поля--concentration plant--wet concentration--final concentrates dirtiness--magnetite iron--magnetic separator systems--barium ferrite--nd-fe-b composite--magnetic field strength
Аннотация: Приведены результаты изучения засоренности конечного концентрата Абагурской обогатительной фабрики ОАО “Евразруда”. Установлены достижимые границы разделения по содержанию магнетитового железа для сепараторов ПБМ с магнитными системами из композита Nd-Fe-B. Рекомендовано полностью заменить в магнитных системах сепараторов ПБМ феррит бария на композит неодим-железо-бор.The results of the investigation into the dirtiness of the final concentrates at the Abagurskaya Concentration Plant at the OAO “Evrazruda” have been presented. The achievable limits of the separation according to the magnetite iron content in case of the PBM separator with the magnetic systems from the Nd-Fe-B composite have been established. It has been recommended to fully replace the barium ferrite by the Nd-Fe-B composite in the magnetic systems of the PBM separators.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Solovyov L. A., Golovnev N. N., Molokeev M. S., Lesnikov M. K.
Заглавие : Bis(μ3-barbiturato−O,O,O′)-(μ2-aqua)- aqua-barium(II): crystal structure, spectroscopic and thermal properties
Место публикации : J. Coord. Chem.: Taylor & Francis, 2017. - Vol. 70, Is. 12. - P.1984-1993. - ISSN 00958972 (ISSN), DOI 10.1080/00958972.2017.1319943
Примечания : Cited References: 21
Ключевые слова (''Своб.индексиров.''): barbituric acid--barium--coordination compound--x-ray diffraction--infrared spectroscopy--thermal analysis
Аннотация: A polymeric coordination compound, [Ba(H2O) 2(Hba)2] (1) (H2ba – barbituric acid, C4H4N2O3), was obtained. The structure of 1 was solved using powder X-ray diffraction methods. The Ba2+ ion in 1 formed a three-capped trigonal prism. The BaO9 polyhedra, connected with each other by the edges and faces, formed a chain. Several 4- and 12-membered cycles due to the bridging μ2-H2O and bridging μ3-Hba– also formed implementing a 3-D polymer structure. The structures of 1 and other thiobarbiturate complexes were compared. The replacement of a S atom by an O atom in the heterocyclic ligand Htba− (thiobarbiturate ion) of the compound Ba(H2O)2(Htba)2 resulted in changes of the coordination number Ba(II) and supramolecular structure. The intermolecular hydrogen bonds O–H⋯O and N–H⋯O formed a 3-D net where pronounced 2-D layers of Hba– ions could be found. A new topological net in 1 was observed. The IR and thermal stability were investigated.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pugachev A. M., Zaytseva I. V., Krylov A. S., Malinovsky V. K., Surovtsev N. V., Borzdov Y. M., Kovalevsky V. I.
Заглавие : Uniaxial mechanical stresses and their influence on the parameters of the ferroelectric phase transition in pressure-treated barium titanate
Место публикации : Ferroelectrics: Taylor & Francis, 2017. - Vol. 508, Is. 1. - P.161-166. - ISSN 00150193 (ISSN), DOI 10.1080/00150193.2017.1289769
Примечания : Cited References: 22
Ключевые слова (''Своб.индексиров.''): batio3--second harmonic generation--residual mechanical stresses--ferroelectric phase transition
Аннотация: The dependence of the E(TO) line in Raman spectrum of a BaTiO3 powder on applied uniaxial pressure up to 14 GPa are obtained and the values of residual mechanical stresses are evaluated. The second harmonic generation technique is used to obtain the width and temperature of the cubic-to-tetragonal phase transition in the powder treated by uniaxial pressures. The interrelations between the phase transition width, temperatures, and residual mechanical stresses are established. These interrelations differ from expectations based on known hydrostatic pressure-induced effects in BaTiO3.
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