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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Li, Oksana A., Lin, Chun-Rong, Chen, Hung-Yi, Hsu, Hua-Shu, Wu, Kai-Wun, Tseng, Yaw-Teng, Bayukov O. A., Edelman I. S., Ovchinnikov S. G., Shih, Kun-Yauh
Заглавие : Structural and magnetic properties of Fe1−xCoxSe1.09 nanoparticles obtained by thermal decomposition
Место публикации : Mater. Res. Express: IOP Publishing, 2015. - Vol. 2, No. 12. - Ст.126501. - ISSN 2053-1591, DOI 10.1088/2053-1591/2/12/126501
Примечания : Cited References: 30. - This work is supported by the Ministry of Science and Technology of Taiwan (MOST103-2811-M-153 -001 and MOST102-2112-M-153 -002 -MY3).
Предметные рубрики: X-RAY-DIFFRACTION
MOSSBAUER-SPECTROSCOPY
CRYSTAL-STRUCTURES
IRON SELENIDES
SUPERCONDUCTIVITY
FeSe
MARCASITE
PYRITE
Ключевые слова (''Своб.индексиров.''): nanoparticles--chalcogenide--iron-cobalt selenide--ferrimagnetism--paramagnetism--mossbauer spectroscopy
Аннотация: A series of Fe1−xCoxSe1.09 (x = 0 to ) nanoparticles were synthesized by thermal decomposition method. Particles in composition range Fe0.5Co0.5Se1.09 to CoSe1.09 crystallized in monoclinic structure of Co6.8Se8 , while FeSe1.09 crystallized in hexagonal structure of FeSe achavalite. Magnetization dependences on temperature and external magnetic field reveal complicated magnetic behavior and correspond to the sum of paramagnetic and superparamagnetic response. Mössbauer spectra contain several paramagnetic doublets with parameters corresponding to nonequivalent positions of divalent and trivalent iron cations with low spin. The nonequivalent positions appeared due to inhomogeneous distribution of Co ions or metal vacancies in iron surrounding.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Goryainov S. V., Krylov A. S., Vtyurin A. N., Pan Y.
Заглавие : Raman study of datolite CaBSiO4(OH) at simultaneously high pressure and high temperature
Коллективы : Russian Foundation for Basic Research [N 14-05-00616, 13-05-00185], Ministry of Education and Science of the Russian Federation
Место публикации : J. Raman Spectrosc.: Wiley-Blackwell, 2015. - Vol. 46, Is. 1. - P.177-181. - ISSN 0377, DOI 10.1002/jrs.4614. - ISSN 10974555(eISSN)
Примечания : Cited References:30. - This work was partly supported by the Russian Foundation for BasicResearch (grants N 14-05-00616 and 13-05-00185) and the Ministry ofEducation and Science of the Russian Federation.
Предметные рубрики: X-RAY-DIFFRACTION
CRYSTAL-STRUCTURE
HYDROGEN-BOND
SPECTROSCOPY
Ключевые слова (''Своб.индексиров.''): raman spectra--datolite--high pressure--high temperature--diamond anvil--cell
Аннотация: Using an in situ method of Raman spectroscopy and resistance-heated diamond anvil cell, the system datolite CaBSiO4(OH) – water has been investigated at simultaneously high pressure and temperature (up to Р ~5 GPa and Т ~250 °С). Two polymorphic transitions have been observed: (1) pressure-induced phase transition or the feature in pressure dependence of Raman band wavenumbers at P = 2 GPа and constant T = 22 °С and (2) heating-induced phase transition at T ~90 °С and P ~5 GPа. The number of Raman bands is retained at the first transition but changed at the second transition. The first transition is mainly distinguished by the changes in the slopes of pressure dependence of Raman peaks at 2 GPa. The second transition is characterized by several strong changes: the wavenumber jumps of major bands, the merging of strong doublets at 378 and 391 cm−1 (values for ambient conditions), the splitting of the intermediate-intensity band at 292 cm−1, and the transformation of some low-wavenumber bands at 160–190 cm−1. No spectral and visual signs of overhydration and amorphization have been observed. No noticeable dissolution of datolite in the water medium occurred at 5 GPa and 250 °С after 3 h, which corresponds to typical conditions of the ‘cold’ zones of slab subduction. Copyright © 2014 John Wiley & Sons, Ltd.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Goryainov S. V., Krylov A. S., Polyansky O. P., Vtyurin A. N.
Заглавие : In-situ Raman study of phengite compressed in water medium under simultaneously high P-T parameters
Коллективы : International GeoRAMAN Conference , Russian Science Foundation [15-17-30012]
Место публикации : J. Raman Spectrosc. - 2017. - Vol. 48, Is. 11. - P.1431-1437. - ISSN 0377-0486, DOI 10.1002/jrs.5112. - ISSN 1097-4555(eISSN)
Примечания : Cited References:57. - This work was supported by the Russian Science Foundation (Grant No. 15-17-30012)
Предметные рубрики: X-RAY-DIFFRACTION
HYDROGEN-BOND DIMERS
POLARIZED IR-SPECTRA
Ключевые слова (''Своб.индексиров.''): raman spectra--phengite--high pressure--high temperature--diamond anvil--cell
Аннотация: The in-situ method of Raman spectroscopy was used to study the layered mineral phengite, K(Al,Mg)2(Si,Al)4O10(OH)2, compressed in water under simultaneously high temperatures and pressures (respectively, up to 373 °С and 12.5 GPa). The implemented conditions were typical of modeling the ‘cold’ subduction zones in lithospheric slabs. The high pressures and temperatures were produced in an electrically heated diamond-anvil cell. Measured Raman spectra have demonstrated a high Р–Т stability of the mineral. No non-quenchable phengite states (no reversible or irreversible polymorphic transitions, overhydration or notable amorphization) were observed in the investigated samples.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Wang, Xuejiao, Molokeev M. S., Zhu, Q.i., Li, Ji-Guang
Заглавие : Controlled hydrothermal crystallization of anhydrous Ln2(OH)4SO4 (Ln = Eu-Lu, Y) as a new family of layered rare earth metal hydroxides
Место публикации : Chem. - A Eur. J. - 2017. - Vol. 23, Is. 63. - P.16034-16043. - ISSN 0947-6539, DOI 10.1002/chem.201703282. - ISSN 1521-3765(eISSN)
Примечания : Cited References:54. - This work is supported in part by the National Natural Science Foundation of China (Grants Nos. 51702020, and 51672039), Doctoral Research Fund of Liaoning Province (Grant No. 20170520103) and the Russian Foundation for Basic Research (17-52-53031). X.W. acknowledges the financial support from the China Scholarship Council for her overseas Ph.D. study (Contract No. 201406080035).
Предметные рубрики: ANION-EXCHANGE MATERIALS
BOND-VALENCE PARAMETERS
X-RAY-DIFFRACTION
Ключевые слова (''Своб.индексиров.''): hydrothermal synthesis--layered compounds--luminescence--oxide sulfates--rare earths
Аннотация: Anhydrous hydroxide sulfates Ln2(OH)4SO4 (Ln=Eu–Lu, Y) were hydrothermally synthesized as a new family of layered rare earth metal hydroxides (LRHs). They crystallize in the monoclinic system (space group C2/m) with structures built up by alternate stacking of interlayer SO42− and the two-dimensional host layer composed of tricapped [LnO9] trigonal prisms along the a axis. In distinct contrast to the recently discovered hydrated LRHs Ln2(OH)4SO4⋅2 H2O, which only exist for Ln=La–Dy, the host layers of the anhydrous phase are linked together by sharing edges instead of an O node of the SO42− tetrahedron. Rietveld refinement showed that the cell dimension tends to decrease for smaller Ln3+, while the axis angle (β=98.78–100.31°) behaves oppositely. Comparative thermogravimetric/differential thermal analysis in air revealed that the dehydroxylation and desulfurization temperatures become gradually higher and lower, respectively, for smaller Ln3+, and thus the temperature range of Ln2O2SO4 existence is narrowed. The newly discovered Ln2(OH)4SO4, together with their hydrated counterparts, allow for the first time green synthesis of Ln2O2SO4 with water as the only exhaust for the full spectrum of lanthanides. Calcining Ln2(OH)4SO4 in H2 yielded phase-pure Ln2O2S for Eu and Gd and a mixture of Ln2O2S and Ln2O3 for the other Ln. The effects of the lanthanide contraction were clearly revealed, and photoluminescence was found for the anhydrous LRHs of Eu and Tb.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gabrienko A. A., Morozov E. V., Subramani V., Martyanov O. N., Kazarian S. G.
Заглавие : Chemical visualization of asphaltenes aggregation processes studied in situ with ATR-FTIR spectroscopic imaging and NMR imaging
Коллективы : Skolkovo Foundation; BP
Место публикации : J. Phys. Chem. C: American Chemical Society, 2015. - Vol. 119, Is. 5. - P.2646-2660. - ISSN 1932-7447, DOI 10.1021/jp511891f
Примечания : Cited References:78. - This research was performed under the UNIHEAT project. The authors wish to acknowledge the Skolkovo Foundation and BP for financial support. The authors thank BP for providing samples of crude oil
Предметные рубрики: MEXICAN CRUDE OILS
X-RAY-DIFFRACTION
INFRARED-SPECTROSCOPY
PETROLEUM ASPHALTENES
MOLECULAR-DYNAMICS
VARIABLE SELECTION
ORGANIC-SOLVENTS
LIGHT-SCATTERING
N-HEPTANE
NEAR-IR
Аннотация: Crude oil phase behavior and asphaltene precipitation have been studied by two complementary chemical imaging methods for the first time. ATR-FTIR spectroscopic imaging approach has revealed the chemical composition of agglomerated and precipitated asphaltenes upon dilution with a flocculant. Asphaltenes, containing oxygen and nitrogen heteroatomic functional groups, have been detected to be least stable. Aromatic abundant asphaltenes have been observed to have relatively high solubility in crude oil/heptane blends. NMR imaging approach, capable of imaging in the bulk of crude oil samples, has demonstrated that n-heptane causes aggregation which can lead to the stable suspension or to the sedimentation followed by the formation of deposits, depending on flocculant concentration. These processes have been monitored for small and large amounts of heptane added to crude oil. The data obtained by ATR-FTIR spectroscopic imaging and NMR imaging have been correlated to propose a possible link between the chemical structure of asphaltenes and a mechanism of the formation of deposits.
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