Библиотека института физики им. Л.В. Киренского СО РАН

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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Lim, Chang Sung, Aleksandrovsky A. S., Atuchin V. V., Molokeev M. S., Oreshonkov A. S.
Заглавие : Microwave sol-gel synthesis, microstructural and spectroscopic properties of scheelite-type ternary molybdate upconversion phosphor NaPbLa(MoO4)3:Er3+/Yb3+
Место публикации : J. Alloys Compd. - 2020. - Vol. 826. - Ст.152095. - ISSN 0925-8388 (ISSN), DOI 10.1016/j.jallcom.2019.152095. - ISSN 1873-4669 (eISSN)
Примечания : Cited References: 53. - This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT and Future Planning (2018R1D1A1A09082321). This study was supported by the Russian Science Foundation (19-42-02003, in part of conceptualization). Also, this study was supported by RFBR (18-32-20011, 18-03-00750).
Аннотация: New ternary molybdate NaPbLa(1-x-y)(MoO4)3:xEr3+,yYb3+ (x = y = 0, x = 0.05 and y = 0.35, 0.4, 0.45 and 0.5) phosphors were successfully fabricated by the MSG (microwave sol-gel) method, and the microstructural and spectroscopic properties were characterized. The crystal structure of NaPbLa(MoO4)3 (NPLM) was defined by Rietveld analysis in space group I41/a with unit cell parameters a = 5.3735(2) and c = 11.8668(4) Å, V = 342.65(3) Å3, Z = 4 (RB = 6.64%). The unit cell volume of NaPbLa(MoO4)3 (NPLM) was intermediate between those of NaLa(MoO4)2 and PbMoO4. Under the 980 nm excitation, upconverted yellowish-green emissions at transitions from 2H11/2 and 4S3/2 were observed. No concentration quenching in the subsystem of donor ions at the content up to 50 at.% and no cross-relaxation losses in the subsystem of acceptor ions at the concentrations as high as 5 at. % were verified. The individual chromaticity points for the NaPbLa(MoO4)3:Er3+,Yb3+ phosphors, corresponding to the equal-energy point in the standard CIE diagram, revealed yellowish-green emissions.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Surikova N., Panin V., Narkevich N., Gordienko A., Volochaev M. N.
Заглавие : Mechanisms of deformation of austenitic stainless steel at cold rolling
Коллективы : International Conference on Advanced Materials with Hierarchical Structure for New Technologies and Reliable Structures 2019
Место публикации : AIP Conf. Proc. - 2019. - Vol. 2167, Is. 1: Proceedings of the International Conference on Advanced Materials with Hierarchical Structure for New Technologies and Reliable Structures 2019. - Ст.020356. - ISSN 0094-243X, DOI 10.1063/1.5132223. - ISSN 1551-7616 (eISSN). - ISSN 978-0-7354-1912-4
Примечания : Cited References: 7. - Work is performed with financial support of a grant of the Russian Federal Property Fund No. 18-08-00221 and partially within PFNI GAN for 2013-2020, direction III.23.
Предметные рубрики: Deformation
X-ray diffraction
Phase transitions
Materials treatment
Аннотация: The structure, mechanical characteristics and mechanisms of plastic deformation of stainless austenitic steel 12Cr15Mn9NiCu after high-temperature cross and screw and cold longitudinal rolling are examined with the help of mechanical testing, X-ray diffraction and electron transmission microscopy. It is shown that deformation martensitic transformations are the main mechanisms of deformation at temperatures less than 20 °C. The modes of thermomechanical treatment, which allow to obtain a good combination of strength and plastic properties in steel have been found out.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Denisenko Y. G., Molokeev M. S., Krylov A. S., Aleksandrovsky A. S., Oreshonkov A. S., Atuchin V. V., Azarapin N. O., Plyusnin P. E., Sal'nikova E. I., Andreev O. V.
Заглавие : High-temperature oxidation of europium (II) sulfide
Место публикации : J. Ind. Eng. Chem. - 2019. - Vol. 79. - P.62-70. - ISSN 1226086X (ISSN) , DOI 10.1016/j.jiec.2019.05.006
Примечания : Cited References: 68. - The authors are grateful for the support from RFBR ( 18-02-00754 , 18-08-00985 , and 18-32-20011 ). This study was also supported by the Russian Science Foundation (project 19-42-02003 , in part of conceptualization).
Аннотация: The process of high-temperature oxidation of EuS in the air was explored in the temperature range of 500–1000 °C. The oxidation reaction enthalpy was determined (ΔH0exp = −1718.5 kJ/mol). The study of oxidation products allowed to establish the mechanism of EuS oxidation with oxygen. At 500–600 °C, EuS is oxidized to a mixture of Eu3+-containing compounds (Eu3S4, Eu2O2S). In the range of 700–1000 °C, only europium oxysulfate Eu2O2SO4 is formed. The structure refinement for Eu2O2SO4 was performed by the Rietveld method. The luminescence intensity of europium oxysulfate Eu2O2SO4 with characteristic 4f-4f transitions from the 5D0 state was investigated as a function of oxidation temperature.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ehrling S., Senkovska I., Bon V., Evans J. D., Petkov P., Krupskaya Y., Kataev V., Wulf T., Krylov A. S., Vtyurin A. N., Krylova S. N., Adichtchev S., Slyusareva E., Weiss M. S., Buchner B., Heine T., Kaskel S.
Заглавие : Crystal size: Versus paddle wheel deformability: Selective gated adsorption transitions of the switchable metal-organic frameworks DUT-8(Co) and DUT-8(Ni)
Место публикации : J. Mater. Chem. A. - 2019. - Vol. 7, Is. 37. - P.21459-21475. - ISSN 20507488 (ISSN), DOI 10.1039/c9ta06781g
Примечания : Cited References: 106. - The authors thank DFG (FOR 2433) for financial support. We thank HZB for the allocation of synchrotron radiation beam-time and financial support. PP, TW and TH used high performance facilities of ZIH Dresden. TW thanks the European Social Funds for Germany for a PhD fellowship.
Аннотация: Switchable pillared layer metal–organic frameworks M2(2,6-ndc)2(dabco) (DUT-8(M), M = Ni, Co, 2,6-ndc = 2,6-naphthalenedicarboxylate, dabco = 1,4-diazabicyclo-[2.2.2]octane, DUT – Dresden University of Technology) were synthesised in two different crystallite size regimes to produce particles up to 300 μm and smaller particles around 0.1 μm, respectively. The textural properties and adsorption-induced switchability of the materials, obtained from both syntheses, were studied by physisorption of N2 at 77 K, CO2 at 195 K and n-butane at 273 K, revealing pronounced differences in adsorption behavior for Ni and Co analogues. While the smaller nano-sized particles (50–200 nm) are rigid and show no gating transitions confirming the importance of crystallite size, the large particles show pronounced switchability with characteristic differences for the two metals resulting in distinct recognition effects for various gases and vapours. Adsorption of various vapours demonstrates consistently a higher energetic barrier for the “gate opening” of DUT-8(Co) in contrast to DUT-8(Ni), as the “gate opening” pressure for Co based material is shifted to a higher value for adsorption of dichloromethane at 298 K. Evaluation of crystallographic data, obtained from single crystal and powder X-ray diffraction analysis, showed distinct geometric differences in the paddle wheel units of the respective MOFs. These differences are further disclosed by solid-state UV-vis, FT-IR and Raman spectroscopy. Magnetic properties of DUT-8(Co) and DUT-8(Ni) were investigated, indicating a high-spin state for both materials at room temperature. Density functional theory (DFT) simulations confirmed distinct energetic differences for Ni and Co analogues with a higher energetic penalty for the structural “gate opening” transformation for DUT-8(Co) compared to DUT-8(Ni) explaining the different flexibility behaviour of these isomorphous MOFs.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gunyakov V. A., Krakhalev M. N., Timofeev I. V., Zyryanov V. Ya., Shabanov V. F.
Заглавие : Optical modes of multilayered photonic structure containing nematic layer with abnormal electroconvective rolls [Electronic resource]
Место публикации : ArXiv. - 2019. - Ст.1912.00368
Вид и объем ресурса: Electronic text data
Примечания : Cited References: 30. - We are grateful to M.N. Volochaev for providing TEM micrograph of the mirror.
Предметные рубрики: Optics
Аннотация: Optical modes of a multilayered photonic structure with the twisted nematic liquid crystal as a defect layer have been investigated. The electroconvective flow in the nematic makes a spatially periodic structure in the form of abnormal rolls. Non-adiabatic propagation of polarized light in the defect layer causes unique features of the optical modes corresponding to the ordinary o-waves. The decay of these modes has been demonstrated with increasing voltage due to the effect of cross-polarization diffraction loss. The modes short-wave shift resulting from the contribution of the non-adiabatic geometric phase to the total phase delay of the wave during a round-trip propagation through the photonic structure has been found both experimentally and numerically.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Grossman V. G., Bazarova J. G., Molokeev M. S., Bazarov B. G.
Заглавие : New triple molybdate K5ScHf(MoO4)6: Synthesis, properties, structure and phase equilibria in the M2MoO4–Sc2(MoO4)3–Hf(MoO4)2 (M = Li, K) systems
Место публикации : J. Solid State Chem. - 2020. - Vol. 283. - Ст.121143. - ISSN 00224596 (ISSN), DOI 10.1016/j.jssc.2019.121143
Примечания : Cited References: 53. - This study was carried out within the state assignment of FASO of Russia (Theme No 0339-2016-0007) as well was supported by RFBR Grants 18-08-00799 and 18-03-00557
Аннотация: Subsolidus phase relations in the M2MoO4–Sc2(MoO4)3–Hf(MoO4)2 (M = Li, K) systems have been studied by the method of “intersecting cuts”. No new triple molybdates have been identified in the Li2MoO4–Sc2(MoO4)3–Hf(MoO4)2 system and a new triple molybdate K5ScHf(MoO4)6 is formed in the K2MoO4–Sc2(MoO4)3–Hf(MoO4)2 system. The structure of K5ScHf(MoO4)6, have been determined in space group Rc through Rietveld analysis of X-ray powder diffraction data. The melting point of molybdate is 999 K. The compound has high ion conductivity (about 10−3 S cm−1).
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bykova L. E., Zharkov S. M., Myagkov V. G., Zhigalov V. S., Patrin G. S.
Заглавие : In situ electron diffraction investigation of solid state synthesis of Co-In2O3 ferromagnetic nanocomposite thin films
Место публикации : JOM. - 2020. - Vol. 72, Is. 6. - P.2139–2145. - ISSN 10474838 (ISSN), DOI 10.1007/s11837-019-03919-5
Примечания : Cited References: 52. - The investigation was conducted under the partial financial support of the Russian Foundation for Basic Research (Grants #18-03-01173 and #19-43-240003).
Аннотация: In situ electron diffraction was used to study structural transformations during the formation of Co-In2O3 ferromagnetic nanocomposite thin films in a thermite reaction of In/Co3O4 bilayer thin films. Heating was performed from room temperature to 600°C at a rate of 4°C/min, while simultaneously electron diffraction patterns were recorded at a speed of 4 frames/min. This made it possible to determine the initiation, 185°C, and finishing, 550°C, temperatures of the solid-state synthesis, as well as the change in the phase composition during the thermite reaction. The synthesized Co-In2O3 film nanocomposite contained ferromagnetic cobalt nanoclusters surrounded by an In2O3 layer, with an average size of 20 nm, and had a magnetization of 400 emu/cm3 and a coercivity of 50 Oe at room temperature. The estimate of the effective interdiffusion coefficient of the reaction suggests that the main mechanism for the formation of the Co-In2O3 nanocomposite is diffusion along the grain boundaries and dislocations.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ikonnikov D. A., Arkhipkin V. G., Vyunishev A. M.
Заглавие : Controlling multiple diffraction with quasiperiodic gratings
Место публикации : Laser Phys. Lett. - 2019. - Vol. 16, Is. 12. - Ст.126202. - ISSN 1612-2011, DOI 10.1088/1612-202X/ab5845. - ISSN 1612-202X (eISSN)
Примечания : Cited References: 23. - The authors thank Prof Anatoly S Chirkin and Sergey A Myslivets for help and fruitful discussions.
Аннотация: Complex diffraction patterns are formed by sophisticated diffraction gratings. However, the methods of synthesizing of such gratings are complicated and resource intensive. We propose a simple analytical approach to forming one- and two-dimensional quasiperiodic gratings supporting multiple diffraction consisting of a set of diffraction maxima with the specified spatial frequency of certain diffraction order. The structure of a quasiperiodic grating is a superposition of harmonic functions, which provide a discrete spatial spectrum. The number of diffraction maxima, their angular positions, and intensity distribution between them can be controlled by choosing appropriate reciprocal lattice vectors and their amplitudes. This effect confirmed by the experiment opens new possibilities for light shaping, imaging, and radiation coupling.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Filatov E. Y., Zadesenets A. V., Komogortsev S. V., Plyusnin P. E., Chepurov A. A., Korenev S. V.
Заглавие : Study of Co x Pt 1-x nanoalloy formation mechanism via single-source precursors
Место публикации : Powder Diffr. - 2019. - Vol. 34, Suppl. S1. - P.S27-S31. - ISSN 08857156 (ISSN) , DOI 10.1017/S0885715619000162
Примечания : Cited References: 13. - This work was supported by the Russian Foundation for Basic Research (Grant nos. 17-03-00950 and 18-03-00777). Aleksei Chepurov acknowledges support of the state assignment project 0330-2016-0012.
Аннотация: This paper is devoted to the study of formation mechanism of metal solid solutions during the thermolysis of single-source precursors in Co–Pt systems with a wide range of superstructural ordering. It is shown that the thermal decomposition of [Pt(NH3)4][Co(C2O4)2(H2O)2]·2H2O salt in helium is critically different from that under hydrogen atmospheres. Thermal degradation under the helium atmosphere is followed by a gradual reduction of platinum and cobalt, and at each thermolysis temperature only one phase is present. At 380 °C an equiatomic Co0.50Pt0.50 solid solution is formed (a = 3.749 (4) Å, Fm−3m space group, V/Z = 13.17 Å3, crystallite size: 5–7 nm). When the precursor is decomposed under a hydrogen atmosphere, the process proceeds mainly through the simultaneous reduction of the platinum and cobalt atoms, and at each temperature section two metal phases are present. The formation of the close to equiatomic Co0.50Pt0.50 solid solution (a = 3.782 (4) Å, Fm−3m space group, V/Z = 13.52 Å3, crystallite size: 7–9 nm) occurs at 450 °C. The calculations of crystallite sizes are confirmed by transmission electron microscopy data.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Golosovsky I. V., Vasilev A. I., Mukhin A. A., Ressouche E., Skumryev V., Urcelay-Olabarria I., Gudim I. A., Bezmaternykh L. N.
Заглавие : Complex magnetic order in the Nd(Tb)Fe3(BO3)4 multiferroic revealed by single-crystal neutron diffraction
Место публикации : Phys. Rev. B. - 2019. - Vol. 99, Is. 13. - Ст.134439. - ISSN 24699950 (ISSN) , DOI 10.1103/PhysRevB.99.134439
Примечания : Cited References: 33. - This work was supported by the Russian Grant No. RFBR 16-02-00058. A.A.M. acknowledges the financial support from the Russian Science Foundation (16-12-10531).
Аннотация: Magnetic structure of the substituted multiferroics-ferroborates Nd0.9Tb0.1Fe3(BO3)4 and Nd0.8Tb0.2Fe3(BO3)4 were determined in the framework of a self-consistent refinement of the single crystal neutron diffraction data. The small substitution of Nd for Tb leads to the reorientation of the main antiferromagnetic vector L from the basal plane towards the hexagonal axis. The reorientation takes place via an angular structure for which L does not coincide with the principal crystallographic directions and evolves with temperature due to competing magnetic anisotropies of Fe, Nd, and Tb subsystems. Our refinement at 2 K reveals the existence of distortions in the collinear antiferromagnetic Fe spin arrangement suggested before in other ferroborates. Therefore, besides the main antiferromagnetic vector L, the magnetic structure involves additional fine symmetrized combinations of spin components allowed by symmetry. They coexist with certain L components and could originate from the antisymmetric Dzyaloshinsky-Moriya Fe-Fe exchange interactions. At higher temperatures, the magnetic structure is described by the simple collinear model, where the L vector is deviated from the hexagonal plane. © 2019 American Physical Society.
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