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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Oreshonkov A. S., Shestakov N. P., Molokeev M. S., Aleksandrovsky A. S., Gudim I. A., Temerov V. L., Adichtchev S. V., Pugachev A. M., Nemtsev I. V., Pogoreltsev E. I., Denisenko Y. G.
Заглавие : Monoclinic SmAl3(BO3)4: synthesis, structural and spectroscopic properties
Коллективы : Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [18-03-00750, 18-05-00682, 18-32-20011]
Место публикации : Acta Crystallogr. B. - 2020. - Vol. 76. - P.654-660. - ISSN 2052-5206(eISSN), DOI 10.1107/S2052520620008781
Примечания : Cited References: 38. - Funding for this research was provided by: Russian Foundation for Basic Research (grant Nos. 18-03-00750, 18-05-00682 and 18-32-20011 to AO)
Предметные рубрики: Optical-properties
Luminescence
Spectra
Crystals
Sm
Аннотация: Single crystals of SmAl3(BO3)4 were synthesized by the group growth on seeds method. The crystal structure was solved using a single-crystal experiment and the purity of the bulk material was proved by the Rietveld method. This borate crystallizes in the monoclinic C2/c space group with unit-cell parameters a = 7.2386 (3), b = 9.3412 (5), c = 11.1013 (4) Å and β = 103.2240 (10)°. IR and Raman spectroscopic analyses confirmed the monoclinic structure of SmAl3(BO3)4. Under 532.1 nm excitation, luminescence spectra exhibit bands assignable to the transitions from 4G5/2 to 6H5/2, 6H7/2, 6H9/2 and 6H11/2. The similarity of the luminescence spectra of the trigonal and monoclinic polymorphs is explained by the minor role of Sm—O bond distortion and the primary role of rotational distortion of SmO6 octahedra. The smaller covalency of the Sm—O bond in alumoborates is deduced in comparison with galloborates. Calorimetric measurements did not reveal high-temperature structural phase transitions up to a temperature of 720 K.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Saykova, Diana, Saikova, Svetlana, Mikhlin, Yuri, Panteleeva, Marina, Ivantsov R. D., Belova E.
Заглавие : Synthesis and characterization of core-shell magnetic nanoparticles NiFe2O4@Au
Место публикации : Metals. - 2020. - Vol. 10, Is. 8. - Ст.1075. - ISSN 2075-4701(eISSN), DOI 10.3390/met10081075
Примечания : Cited References: 45
Предметные рубрики: NICKEL FERRITE NANOPARTICLES
GOLD NANOPARTICLES
OXIDATION
REDUCTION
Аннотация: In this study, NiFe2O4@Au core–shell nanoparticles were prepared by the direct reduction of gold on the magnetic surface using amino acid methionine as a reducer and a stabilizing agent simultaneously. The obtained nanoparticles after three steps of gold deposition had an average size of about 120 nm. The analysis of particles was performed by X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, and UV-Vis spectroscopy techniques. The results indicate successful synthesis of core–shell particles with the magnetic core, which consists of a few agglomerated nickel ferrite crystals with an average size 25.2 ± 2.0 nm, and the thick gold shell consists of fused Au0 nanoparticles (NPs). Magnetic properties of the obtained nanoparticles were examined with magnetic circular dichroism. It was shown that the magnetic behavior of NiFe2O4@Au NPs is typical for superparamagnetic NPs and corresponds to that for NiFe2O4 NPs without a gold shell. The results indicate the successful synthesis of core–shell particles with the magnetic nickel ferrite core and thick gold shell, and open the potential for the application of the investigated hybrid nanoparticles in hyperthermia, targeted drug delivery, magnetic resonance imaging, or cell separation. The developed synthesis strategy can be extended to other metal ferrites and iron oxides.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Grishina, Svetlana, Kodera, Peter, Goryainov, Sergey, Oreshonkov A. S., Seryotkin, Yurii, Simko, Frantisek, Polozov, Alexander G.
Заглавие : Application of Raman spectroscopy for identification of rinneite (K3NaFeCl6) in inclusions in minerals
Коллективы : Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [18-05-00682]; European Regional Development FundEuropean Union (EU) [ITMS 26240220086]; Vedecka Grantova Agentura MSVVaS SR a SAV [1/0313/20]
Место публикации : J. Raman Spectrosc. - 2020. - Vol. 51, Is. 12. - P.2505-2516. - ISSN 0377-0486, DOI 10.1002/jrs.6005. - ISSN 1097-4555(eISSN)
Примечания : Cited References: 55. - Russian Foundation for Basic Research, Grant/Award Numbers: 18-05-00682, 18-05-00682; European Regional Development Fund, Grant/Award Number: ITMS 26240220086; Vedecka Grantova Agentura MSVVaS SR a SAV, Grant/Award Number: 1/0313/20
Предметные рубрики: SALT MELT
IRON
DEPOSIT
FLUIDS
TRANSFORMATIONS
FERRIHYDRITE
Аннотация: Solid daughter phases in fluid and salt melt inclusions in minerals provide important clues to characterization of mineral‐forming processes. The analysis of the fluid inclusions often requires the exposure of the daughter minerals. Rinneite (K3NaFeCl6), which is a hygroscopic mineral, decomposes in air and cannot thus be identified by conventional methods. A combined approach has been applied for investigation of synthetic and natural rinneite to acquire its diagnostic Raman spectrum for a nondestructive identification. We used natural rinneite inclusions in halite, suitable for applying a complex of methods, to clear up the reference spectrum. Improved high‐resolution X‐ray diffraction (XRD) data obtained from natural rinneite inclusion are comparable with that of previously published, with similar unit cell dimensions. Polarized Raman spectra of natural inclusions were obtained using different geometries and polarization of the incident and scattered light. Interpretation of experimental Raman spectra was performed within the framework of lattice dynamics simulations and group analysis. Individual spectral bands are interpreted in terms of Raman‐active vibrational modes of K3NaFeCl6 structural units. Raman spectrum of synthetic rinneite with main peaks at 75, 91, 103, 143, 167, 171, 187, and 239 cm−1 agrees well with the spectra of rinneite inclusions in halite from the Nepa potash deposit and rinneite daughter minerals in salt melt inclusions hosted by quartz veinlets from the porphyry gold systems in the Central Slovakia Volcanic Field. This provides a firm basis for any future identification of this mineral worldwide, using nondestructive Raman spectroscopy.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ekholm V., Chiuzbaian G. S., Sathe C., Nicolaou A., Guarise M., Simon M., Jaouen N., Luning J., Hague C. F., Gel'mukhanov F., Odelius M., Bjorneholm O., Rubensson, J-E
Заглавие : Core-hole localization and ultra-fast dissociation in SF6
Коллективы : Swedish Research Council (VR)Swedish Research Council; Russian Science FoundationRussian Science Foundation (RSF) [16-12-10109]
Место публикации : J. Phys. B. - 2020. - Vol. 53, Is. 18. - Ст.185101. - ISSN 0953-4075, DOI 10.1088/1361-6455/aba204. - ISSN 1361-6455(eISSN)
Примечания : Cited References: 36. - This work was supported by the Swedish Research Council (VR). The calculations were performed on resources provided by the Swedish National Infrastructure for Computing (SNIC). FG acknowledges support within the Russian Science Foundation (Project No. 16-12-10109)
Предметные рубрики: X-RAY-EMISSION
SYMMETRY-BREAKING
AB-INITIO
SPECTROSCOPY
SPECTRA
Аннотация: Resonant inelastic x-ray scattering spectra excited at the fluorine K resonances of SF6 have been recorded. While a small but significant propensity for electronically parity-allowed transitions is found, the observation of parity-forbidden electronic transitions is attributed to vibronic coupling that breaks the global inversion symmetry of the electronic wavefunction and localizes the core hole. The dependence of the scattering cross section on the polarization of the incident radiation and the scattering angle is interpreted in terms of local π/σ symmetry around the S–F bond. This symmetry selectivity prevails during the dissociation that occurs during the scattering process.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Verpekin V. V., Ahremchik I. S., Vasiliev A. D., Burmakina G. V., Kondrasenko A. A., Nedelina T. S., Kreindlin A. Z.
Заглавие : Transition metal catalyzed Fe–C coupling reactions in synthesis of dicarbonyl(2-thienylethynyl)(η5-cyclopentadienyl)iron complex: Spectroscopic, structure and electrochemical study
Место публикации : Transit. Met. Chem. - 2020. - Vol. 45. - P.589-594. - ISSN 03404285 (ISSN), DOI 10.1007/s11243-020-00413-9
Примечания : Cited References: 31. - This research was funded by a grant from the Russian Science Foundation (Project No. 18-73-00150)
Аннотация: The new σ-alkynyl iron(II) complex Cp(CO)2Fe-C≡C-(2-C4H3S) was synthesized with application of several known approaches based on the transition metal (Pd/Cu–, Au–, Cu– and Pd–) catalyzed Fe–C coupling reactions of 2-ethynylthiophene or 2-[(trimethylsilyl)ethynyl]thiophene with cyclopentadienyliron dicarbonyl iodide. The yield of the complex in these reactions was found to strongly depend on the catalyst used. The conditions, catalysts, and reagents that provide the highest yields of the desired 2-thienylethynyl iron complex were determined. The complex was characterized by IR, 1H and 13C NMR spectroscopy. The molecular structure of Cp(CO)2Fe–C≡C-(2-C4H3S) established by X-ray diffraction analysis exhibits a three-leg piano stool geometry. The redox properties of the new complex were studied.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Krylov A. S., Senkovska I., Ehrling S., Maliuta M., Krylova S. N., Slyusareva E., Vtyurin A. N., Kaskel S.
Заглавие : Single particle Raman spectroscopy analysis of the metal-organic framework DUT-8(Ni) switching transition under hydrostatic pressure
Место публикации : Chem. Commun. - 2020. - Vol. 56, Is. 59. - P.8269-8272. - ISSN 1364548X (ISSN), DOI 10.1039/d0cc02491k
Примечания : Cited References: 40. - This work is financially supported by the Russian Foundation for Basic Research No18-02-00754 and German research foundation (FOR 2433, MOF-switches). The authors would like to thank Dr. V. Bon for support and scientific discussions
Аннотация: Experimental in situ observations of phase coexistence in switchable metal-organic frameworks are reported to provide a fundamental understanding of dynamic adsorbents that can change their pore structure in response to external stimuli. A prototypical flexible pillared layer framework DUT-8(Ni) (DUT = Dresden University of Technology) was studied under hydrostatic pressure by in situ Raman spectroscopy on single crystals. The closing transition of the open pore phase (op) containing DMF in the pores in silicon oil as a pressure transmitting fluid, as well as the closed pore phase (cp) to op transition under pressure in methanol, were studied. Phase coexistences during both transitions were observed.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mikhlin Y. L., Nasluzov V., Ivaneeva A., Vorobyev S., Likhatski M., Romanchenko A., Krylov A. S., Zharkov S. M., Meira D. M.
Заглавие : Formation, evolution and characteristics of copper sulfide nanoparticles in the reactions of aqueous cupric and sulfide ions
Место публикации : Mater. Chem. Phys. - 2020. - Vol. 255. - Ст.123600. - ISSN 02540584 (ISSN), DOI 10.1016/j.matchemphys.2020.123600
Примечания : Cited References: 74. - This research was supported by the Russian Foundation for Basic Research , project 18-03-00526a . We thank the ESRF for allocating beamtime, and the BM23 staff for their help during the experiments. Facilities of the Krasnoyarsk Regional Research Equipment Centre of SB RAS were employed in the work
Аннотация: Colloidal copper sulfides produced in reactions of aqueous copper and sulfide ions are important for many materials applications, environment and mineral processing. Here, CuxS nanoparticles formed and aged at varying copper sulfate to sodium sulfide ratios were studied using in situ UV–vis–NIR spectroscopy, dynamic light scattering, X-ray absorption spectroscopy, ex situ TEM, X-ray photoelectron spectroscopy and Raman scattering, and DFT + U calculations. It was established that the ratio of aqueous Cu2+ to S2− ions of 1:2 is critical for the reaction, which yields disordered covellite-like 4–6 nm Cu0.7S nanoparticles comprised polysulfide species at this and higher sulfide concentrations; upon aging, the particles release sulfur and transform to chalcocite-like structure (Cu2-xS, x  1). Conversely, at the “excess” of copper ions, Cu2-xS-type particles grew into 12–14 nm “covellitic” nanoparticles. The optical absorbance at 1100–1200 nm commonly attributed to localized surface plasmon resonance increased with time and was lowest for Cu2+/S2−
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Krylov A. S.
Заглавие : Raman spectroscopy of crystals
Место публикации : Crystals. - 2020. - Vol. 10, Is. 11. - Ст.981. - P.1-4. - ISSN 20734352 (ISSN), DOI 10.3390/cryst10110981
Примечания : Cited References: 10
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Крылов, Александр Сергеевич, Мошкина, Евгения Михайловна, Гудим, Ирина Анатольевна, Крылова, Светлана Николаевна, Втюрин, Александр Николаевич
Заглавие : Фазовые переходы в кристаллах мультиферроиков со структурой хантита, содержащих ионы редкоземельных элементов - исследования методом комбинационного рассеяния света
Коллективы : Исследование сегнетоэлектрических материалов российскими учеными. Столетие открытия сегнетоэлектричества, международная онлайн-конференция, Уральский Федеральный университет им. Первого Президента России Б.Н. Ельцина
Место публикации : Втюрин, Александр Николаевич Исследование сегнетоэлектрических материалов российскими учеными. Столетие открытия сегнетоэлектричества, международная онлайн-конференция (2020 ; 14-19 сент. ; Екатеринбург). Международная онлайн-конференция "Исследование сегнетоэлектрических материалов российскими учеными. Столетие открытия сегнетоэлектричества" (СЭ-100): сб. тезисов/ Александр Николаевич Втюрин ; чл. прогр. ком. А. Н. Втюрин. - 2020. - Ст.П17. - С. 26-27. - ISBN 978-5-9500624-3-8
Примечания : Cited References: 7
Аннотация: Изучены эффекты, связанные с параметрами структурного порядка и магнитного упорядочения при фазовых переходах в спектрах комбинационного рассеяния света монокристаллов и твердых растворов кристаллов (Hо-Nd)Fe3(BO3)4, (Sm-La)Fe3(BO3)4, Hо(Fe-Ga)3(BO3)4, Tb(Fe-Ga)3(BO3)4 и Nb(Fe-Ga)3(BO3)4.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Korzhneva K. E., Bekenev V. L., Khyzhun O. Y., Goloshumova A. A., Tarasova A. Y., Molokeev M. S., Isaenko L. I., Kurus A. F.
Заглавие : Single crystal growth and the electronic structure of Rb2Na(NO3)3: Experiment and theory
Место публикации : J. Solid State Chem. - 2021. - Vol. 294. - Ст.121910. - ISSN 00224596 (ISSN), DOI 10.1016/j.jssc.2020.121910
Примечания : Cited References: 54. - This work was done on state assignment of IGM SB RAS, Ministry of Science and Higher Education of the Russian Federation; NSU BCH-2020-0036-4 (10988) (XRD analysis), and was supported by Russian Foundation for Basic Research (grants Nos. 18-32-00359 , 19-42-540012)
Аннотация: Rb2Na(NO3)3 crystals demonstrate nonlinear optical properties and can be used as a converter of laser radiation in the shortwave region. The crystals were grown in the present work by the Bridgman–Stockbarger method in a ratio of 75 wt%(RbNO3) and 25 wt%(NaNO3). After the growth, a transparent centimeter size single crystal (6 cm long) was obtained for the first time that is very important for its practical application. The unit cell volume of double Rb2Na(NO3)3 nitrate is intermediate between the cell volumes of simple rubidium and sodium nitrates, RbNO3 and NaNO3. Electronic structure of Rb2Na(NO3)3 was studied in the present work from both experimental and theoretical viewpoints. In particular, employing X-ray photoelectron spectroscopy, we have measured binding energies of core electrons and energy distribution of the electronic states within the valence band region of the Rb2Na(NO3)3 crystal and established rather big binding energies for N 1s and O 1s core-level electrons. The bombardment of middle-energy Ar+ ions induces transformation of some nitrogen atoms of the analyzing topmost layers of the Rb2Na(NO3)3 crystal surface from the NO3– group to the NO2– group. To explore in detail the filling of the valence band of Rb2Na(NO3)3 by electronic states associated with constituting atoms, we use first-principles calculations within a density functional theory (DFT) framework. The DFT calculations reveal that O 2p states are the principal contributors to the valence band bringing the main input in its upper portion. The theoretical finding is supported experimentally by fitting the X-ray photoelectron valence band spectrum and the X-ray emission O Kα band on the total energy scale. The conduction band bottom of Rb2Na(NO3)3 is composed by unoccupied O 2p and N 2p states in almost equal proportion.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Shetty P. P., Babu M., Maksimov D. N., Bingi J.
Заглавие : Thermo-optic refraction in MoS2 medium for “Normally on” all optical switch
Место публикации : Opt. Mater. - 2021. - Vol. 112. - Ст.110777. - ISSN 09253467 (ISSN), DOI 10.1016/j.optmat.2020.110777
Примечания : Cited References: 25. - Authors acknowledge the funding support from DST India under INT/RUS/RFBR/P-262
Аннотация: Two dimensional (2D) nanomaterials like Molybdenum disulfide (MoS2) have been drawing a lot of interest due to their excellent nonlinear optical response. In this research we study thermal lens formation in MoS2 nanoflakes dispersion using mode mismatched pump probe configuration. Observation of the pump and probe beam intensity patterns gave visual insights on time evolution of photothermal lens formation. Effect of MoS2 nanoflakes concentration on thermo-optic properties of dispersions were studied using thermal lens spectroscopy technique. Further, a thermo-optic refraction based technique to measure thermal lens size is proposed. Thermal lens region size increased with increase in pump power. The observed thermal lens modulation is applied to demonstrate ‘normally on’ all optical switch which showed excellent modulation of output beam signal by pump beam.
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12.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Крылов, Александр Сергеевич, Senkovska I., Ehrling S., Maliuta M., Крылова, Светлана Николаевна, Слюсарева, Евгения Алексеевна, Втюрин, Александр Николаевич, Kaskel S.
Заглавие : Фазовый переход в каркасной металло-органической структуре DUT-8(Ni) под давлением – исследование методом комбинационного рассеяния
Коллективы : Исследование сегнетоэлектрических материалов российскими учеными. Столетие открытия сегнетоэлектричества, международная онлайн-конференция, Уральский Федеральный университет им. Первого Президента России Б.Н. Ельцина
Место публикации : Втюрин, Александр Николаевич Исследование сегнетоэлектрических материалов российскими учеными. Столетие открытия сегнетоэлектричества, международная онлайн-конференция (2020 ; 14-19 сент. ; Екатеринбург). Международная онлайн конференция "Исследование сегнетоэлектрических материалов российскими учеными. Столетие открытия сегнетоэлектричества" (СЭ-100): сб. тез. конф./ Александр Николаевич Втюрин ; чл. прогр. ком. А. Н. Втюрин. - 2020. - Ст.П3. - С. 7. - ISBN 978-5-9500624-3-8
Примечания : Cited References: 3
Аннотация: Методом комбинационного рассеяния исследована гибкая каркасная структура DUT-8(Ni) под давлением. Установлено, что индуцированная давлением трансформация открытой структуры в закрытую происходит, как фазовый переход первого рода. В некотором интервале давлений сосуществуют домены открытой и закрытой фаз.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gerasimova Yu. V., Krylov A. S., Vtyurin A. N., Laptash N. M., Krylova S. N.
Заглавие : Ferroelastic phase transition in the family of double fluoride crystals by Raman spectroscopy
Коллективы : European Meeting on Ferroelectricity
Место публикации : Ferroelectrics. - 2020. - Vol. 568, Is. 1. - P.185-190. - DOI 10.1080/00150193.2020.1713348
Примечания : Cited References: 14. - This research is supported by Russian Foundation for Basic Research under Grant No. 17-02-00920
Аннотация: In order to clarify ordering mechanisms of ferroic phase transitions in double fluoride salts (NH4)3SnF7, (NH4)3GeF7 and (NH4)3TiF7, their Raman scattering spectra have been studied in wide ranges of frequencies (20–3400 cm−1) and temperatures (8–410 K). Substitution of the central ion in the octahedron groups was found to change not only the phase transition types and sequences, but to modify the types of structural disorder as well, which is a special feature of these high-symmetry fluoride crystals.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bikbaev R. G., Vetrov S. Ya., Timofeev I. V.
Заглавие : Hybrid Tamm and surface plasmon polaritons in resonant photonic structure
Место публикации : J. Quant. Spectrosc. Radiat. Transf. - 2020. - Vol. 253. - Ст.107156. - ISSN 00224073 (ISSN), DOI 10.1016/j.jqsrt.2020.107156
Примечания : Cited References: 58. - The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund to the research project No. 19-42-240004 and by a joint project of the Russian Foundation for Basic Research, project No. 19-52-52006, and the Taiwan Ministry of Science and Technology, project No. 108-2923E-009-003-MY3
Аннотация: Hybrid modes originating from the coupling of the Tamm and surface plasmon polaritons excited in a one-dimensional resonant photonic structure are demonstrated. The structure represents a photonic crystal bounded by a nanocomposite film consisting of a transparent matrix and silver nanoparticles uniformly distributed over its volume. In comparison with structures on planar metal films the volume concentration and shape of nanoparticles are of great help in configuring the hybrid mode properties, including their wavelength and splitting. Also the radiation incidence angle variation opens the possibility of fine-tuning the energy spectra of the structure. We demonstrate the high-sensitivity of optical sensors based on the resonant photonic structure.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Coondoo I., Panwar N., Krylova S. N., Krylov A. S., Alikin D., Jakka S. K., Turygin A., Shur V. Y., Kholkin A. L.
Заглавие : Temperature-dependent Raman spectroscopy, domain morphology and photoluminescence studies in lead-free BCZT ceramic
Место публикации : Ceram. Int. - 2021. - Vol. 47, Is. 2. - P.2828-2838. - ISSN 02728842 (ISSN), DOI 10.1016/j.ceramint.2020.09.137
Примечания : Cited References: 65. - I.C. would like to thank financial assistance by national funds (OE), through FCT – Fundação para a Ciência e a Tecnologia, I.P., in the scope of the framework contract foreseen in the numbers 4, 5 and 6 of the article 23, of the Decree-Law 57/2016, of August 29, changed by Law 57/2017, of July 19. This work was developed within the scope of the project CICECO-Aveiro Institute of Materials, UIDB/50011/2020 & UIDP/50011/2020, financed by national funds through the Portuguese Foundation for Science and Technology / MCTES . The authors would also like to acknowledge the Ural Center for Shared Use “Modern nanotechnology”, Ural Federal University, Russia and the Krasnoyarsk Regional Center of Research Equipment of Federal Research Center “Krasnoyarsk Science Center SB RAS”. The authors would like to thank Dr. E. Venkata Ramana, Department of Physics, University of Aveiro for the dielectric measurements. The work was supported by Government of the Russian Federation (Act 211, 440 Agreement 02.A03.21.0006)
Аннотация: Present work focuses on detailed temperature-dependent X-ray diffraction, Raman scattering, domain configuration, and photoluminescence (PL) studies in the (Ba0·85Ca0.15) (Zr0·10Ti0.90)O3 (BCZT) ceramics. The comprehensive Raman spectroscopy analysis in the present work not only validates the presence of the intermediate orthorhombic phase in BCZT, but also provides evidence of another transition: rhombohedral R3c phase to R3m at low temperature. Temperature behaviour of the lowest frequency transverse optical mode (soft E (TO) phonon) and hard modes was studied. Temperature dependence of peak positions, intensities, and linewidths of Raman phonon modes signalled the presence of phase transitions near −50 ± 5 °C, 0±5 °C, 35±5 °C and 110 ± 10 °C. Evolution of domain morphology occurring at phase transitions above room temperature was studied by piezoresponse force microscopy technique. Analysis of PL spectra revealed disorder/heterogeneity in the sample and indicated the existence of self-trapped excitons. PL spectra are composed of four distinct colour components (~2.55eV:blue, ~2.32eV:green, ~2.08eV:orange and ~1.78eV:red).
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Boca M., Molokeev M. S., Rakhmatullin A., Kubikova B., Netriova Z.
Заглавие : The structure of the metastable K18Ta5Zr5F63 phase
Место публикации : New J. Chem. - 2020. - Vol. 44, Is. 22. - P.9264-9270. - ISSN 11440546 (ISSN), DOI 10.1039/d0nj02428g
Примечания : Cited References: 30. - Financial support from TGIR-RMN-THC Fr3050 CNRS for conducting the research is gratefully acknowledged. This work was supported by the Slovak Research and Development Agency under the contract no. APVV-15-0479. This work was financially supported by the Scientific Grant Agency of the Ministry of Education of the Slovak Republic and the Slovak Academy of Sciences, grant no. Vega 2/0024/20
Аннотация: A metastable phase K18Ta5Zr5F63 was prepared by molten salt synthesis of K2TaF7 and K2ZrF6 in a sealed Pt crucible. This is the first example of a structure of a fluoride complex compound containing both tantalum and zirconium as central atoms. The asymmetric part of the unit cell contains two Ta/Zr sites and one pure Zr site. The Ta1/Zr1 ion is coordinated by seven F ions forming one capped trigonal prism. The Ta2/Zr2 ion is coordinated by six F ions forming a trigonal prism, and this polyhedron is fully ordered. The Zr3 ion is coordinated by six F ions, which are disordered over two positions. All (Zr/Ta)Fn (n = 6–8) polyhedra are isolated from each other, although the ZrF6 units have shared faces, forming an infinite channel along the c-axis. 19F MAS NMR experiments agree with the proposed structural model, identifying all five central non-equivalent polyhedra. The K18Ta5Zr5F63 phase decomposes within several months to its initial components; this can be monitored by NMR, DSC and XRD experiments. Moreover, accelerated decomposition can be achieved by thermal treatment, resulting in the formation of a K3ZrF7 phase.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Shi, Xin, Wu, Yong, Wang, Jian Guo, Kimberg V., Zhang, Song Bin
Заглавие : X-ray transient absorption spectroscopy by an ultrashort x-ray-laser pulse in a continuous-wave IR field
Место публикации : Phys. Rev. A. - 2020. - Vol. 101, Is. 2. - Ст.023401. - ISSN 2469-9926, DOI 10.1103/PhysRevA.101.023401. - ISSN 2469-9934(eISSN)
Примечания : Cited References: 56. - Grants from the National Basic Research Program of China (Grant No. 2017YFA0403200), National Natural Science Foundation of China (Grants No. 11604197, No. 11934004, and No. 11974230), the Science Challenge Program of China (Grants No. TZ2018005 and No. TZ2016005), and the Organization Department of CCCPC are acknowledged. V.K. acknowledges financial support from Swedish Research Council within the State Contract of the Ministry of Education and Science of the Russian Federation for Siberian Federal University for Scientific Research in 2017-2019 (Project No. 3.2662.2017)
Предметные рубрики: MOLECULAR NITROGEN
TIME
DYNAMICS
PHASE
SPECTRA
DECAY
Аннотация: X-ray transient absorption spectra (XTAS) of molecules are theoretically investigated in a femtosecond x-ray pump and continuous-wave (cw) infrared (IR)-control scenario. The scheme is exemplified by a CO molecule resonantly pumped into carbon and oxygen core-excited 1s→π∗ states by a weak femtosecond x-ray pulse, while dynamic Stark shifts are induced by the cw IR-control radiation. As a result, significant shoulder structures appear in XTAS showing strong dependence on the phase of IR radiation relative to the envelope of the x-ray pulse. Due to a significant difference in the frequencies of the two pulses, the present XTAS scheme provides much clear interpretation of the dynamic Stark effects as compared to the attosecond UV transient absorption scenario. Within the suggested two-level model, where the total spectrum is decomposed as incoherent superposition of contributions from different vibrational excitations weighted by the Franck-Condon Factors, all spectral structures can be well identified and interpreted in a good agreement with the full-scale molecular simulations. Well-characterized XTAS in the proposed IR-control scheme can be applied for fine phase synchronization between IR and x-ray pulses, highly demanded in modern experiments on x-ray free-electron lasers.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aplesnin S. S., Kharkov A. M., Filipson G. Y.
Заглавие : Magnetic capacitance in variable-valence manganese sulfides
Место публикации : Phys. Status Solidi B. - 2020. - Vol. 257, Is. 5. - Ст.1900637. - ISSN 03701972 (ISSN), DOI 10.1002/pssb.201900637
Примечания : Cited References: 12. - This study was supported by the Russian Foundation for Basic Research No. 18-32-00079 mol_a. The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science No. 18-42-240001 r_a
Аннотация: The permittivity of TmxMn1–xS (0 < x < 0.15) solid solutions is measured in the frequency range of 102–106 Hz at temperatures of 300–500 K in magnetic fields of up to 12 kOe. The migration and relaxation conductivity contributions to the electric polarization are established. The relaxation time and activation energy are calculated using the Debye model. A decrease in the capacitance and relaxation time in a magnetic field is observed. The electron polarization relaxation channel provided by recombination of the electron–hole pairs is found using the infrared spectroscopy investigations.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Moshkina E. M., Krylova S. N., Gudim I. A., Molokeev M. S., Temerov V. L., Pavlovskiy M. S., Vtyurin A. N., Krylov A. S.
Заглавие : Gallium composition-dependent structural phase transitions in HoFe3-xGax(BO3)4 solid solutions: crystal growth, structure, and Raman spectroscopy study
Место публикации : Cryst. Growth Des. - 2020. - Vol. 20, Is. 2. - P.1058-1069. - ISSN 15287483 (ISSN), DOI 10.1021/acs.cgd.9b01387
Примечания : Cited References: 30. - The reported study was funded by the Russian Foundation for Basic Research No. 18-02-00754. The experiments were performed using equipment of Center for Common Use, Krasnoyarsk Scientific Center, FSC SB RAS
Аннотация: Single crystals of solid solutions of HoFe3–xGax(BO3)4 with x = 0, 0.5, 1, 1.5, and 3 were obtained using flux synthesis. The conditions of the synthesis are described in detail. The structural properties of each of the synthesized samples were studied using X-ray powder diffraction analysis at several temperature points (303, 403, and 503 K). The structural parameters of the obtained samples and the “pure” compounds HoFe3(BO3)4 and HoGa3(BO3)4 were compared. The Raman spectra of the obtained solid solutions HoFe3–xGax(BO3)4 were studied in a wide temperature range (T = 10–400 K). The vibrational spectra and eigenvectors of the HoFe3Ga(BO3)4 and HoGa3(BO3)4 in R32 phase and HoFe3Ga(BO3)4 in P3121 phase were calculated within density functional theory. The features of the Raman spectra of HoFe2Ga(BO3)4, HoFe2.5Ga0.5(BO3)4, HoFe3(BO3)4 crystals associated with the R32 → P3121 structural phase transition, which have a strong dependence on the degree of substitution x, were investigated. Peculiarities of the Raman spectra, which are associated with magnetic ordering in HoFe1.5Ga1.5(BO3)4, HoFe2Ga(BO3)4, and HoFe2.5Ga0.5(BO3)4 crystals, were detected.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Popova E. A., Chukalina E. P., Boldyrev K. N., Jablunovskis A., Gudim I. A.
Заглавие : Magnetic structure of ErFe3(BO3)4: Spectroscopic and thermodynamic studies
Место публикации : J. Magn. Magn. Mater. - 2020. - Vol. 500. - Ст.166374. - ISSN 03048853 (ISSN), DOI 10.1016/j.jmmm.2019.166374
Примечания : Cited References: 14. - E.P.Ch., and K.N.B. acknowledge a financial support of the Russian Science Foundation under Grant # 19-12-00413. The calculational part of the article was prepared by . E.A.P. within the framework of the Academic Fund Program at the National Research University Higher School of Economics (HSE University) in 2019 (grant №19-04-030) and by the Russian Academic Excellence Project «5-100»
Аннотация: We report on the high-resolution spectroscopic study of multiferroic ErFe3(BO3)4. The energies of all eight Kramers doublets of the ground 4I15/2 multiplet of the Er3+ ion were determined by the high-resolution 4I13/2 → 4I15/2 infrared luminescence spectra. The spectroscopically determined temperature dependence of the splitting of the ground Kramers doublet was used to calculate the contribution of the erbium subsystem into the specific heat and the magnetic susceptibility of erbium iron borate. The analysis of the thermodynamic properties based on these calculations allowed us to suggest the domain structure in the easy-plane antiferromagnetically ordered iron subsystem, with two magnetically nonequivalent erbium positions in each domain.
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