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A comparative study of transport properties of composites HTSC+MgTiO3 and HTSC + NiTiO3. The effect of paramagnetic NiTiO3 / M. I. Petrov, D. A. Balaev, K. A. Shaikhutdinov, K. S. Aleksandrov // Physica C-Superconductivity and its Applications. - 2000. - Vol. 341-348, Pt. 3. - P. 1863-1864, DOI 10.1016/S0921-4534(00)01217-X . - ISSN 0921-4534
Кл.слова (ненормированные):
Composite materials -- Copper oxides -- Josephson junction devices -- Magnesium compounds -- Nickel compounds -- Paramagnetism -- Superconductivity -- Thermal effects -- Transport properties -- Yttrium compounds -- Abrikosov vortices flow -- Superconductor insulator superconductor junction -- Thermally activated phase slippage -- High temperature superconductors
Аннотация: Bulk composites Y3/4Lu1/4Ba2Cu3O7+NiTiO3 and Y3/4Lu1/4Ba2Cu3O7+MgTiO3 with insulator volume content 7.5% and 15% modelling a network of Superconductor-Insulator-Superconductor (S-I-S) junctions have been prepared. The ?(T) dependences of composites HTSC+MgTiO3 are described well by the mechanism of Thermally Activated Phase Slippage (TAPS). The anomalous behavior of resistivity ?(T) of HTSC+NiTiO3 composites manifesting as a kink on ?(T) curves at some temperature Tm have been observed. In the temperature range Tm < T < TC the dissipation is Ohmic while below Tm the CVCs are strongly non-linear. This peculiarity is interpreted as arisen owing to Abrikosov vortices flow.

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Доп.точки доступа:
Petrov, M. I.; Петров, Михаил Иванович; Balaev, D. A.; Балаев, Дмитрий Александрович; Shaikhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Aleksandrov, K. S.; Александров, Кирилл Сергеевич; International conference on materials and mechanisms of superconductivity high temperature superconductors(6 ; 2000 ; Feb. ; 20-25 ; Houston, Texas, USA)
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Ab-initio investigation of hydrogen absorption by magnesium nanoparticles [Text] / A. S. Fedorov, G. N1. Churilov [et al.] // Carbon Nanomaterials in Clean-Energy Hydrogen Systems : Proceedings of the NATO Advanced Research Workshop on Using Carbon Nanomaterials in Clean-Energy Hydrogen Systems Sudak, Crimea, Ukraine 22–28 September 2007 / red. Baranowski, B.; Zaginaichenko, S.; Schur, D.; Skorokhod, V.; Veziroglu, A. : Springer, 2008. - P603-610. - (SNATO Science for Peace and Security Series Subseries: NATO Science for Peace and Security Series C: Environmental Security), DOI 10.1007/978-1-4020-8898-8_75 . - ISBN 1874-6519

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Доп.точки доступа:
Fedorov, A. S.; Федоров, Александр Семенович; Churilov, G. N.; Чурилов, Григорий Николаевич; Kuzubov, A.A.; Serjantova, M.V.; "Carbon Nanomaterials in Clean-Energy Hydrogen Systems", national conference(2008 ; Sep. ; 22-28 ; Sudak, Crimea)
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Balaev, A. D.
Magnetic and mossbauer studies of magnesium-chromium ferrites / A. D. Balaev, O. A. Bayukov, A. F. Savitskii // Phys. Status Solidi B. - 1989. - Vol. 152, Is. 2. - P. 639-644, DOI 10.1002/pssb.2221520226. - Cited References: 10 . - ISSN 0370-1972

РУБ Physics, Condensed Matter

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Доп.точки доступа:
Bayukov, O. A.; Баюков, Олег Артемьевич; Savitskii, A. F.; Балаев, Александр Дмитриевич
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    Complex of ceftriaxone with Mg(II): Synthesis, structure, spectral and antibacterial properties / G. V. Novikova, D. I. Tsyplenkova, A. A. Kuzubov [et al.] // J. Sib. Fed. Univ. Chem. - 2023. - Vol. 16, Is. 1. - P. 5-15 ; Журн. СФУ. Химия. - Cited References: 28. - The research was funded by RFBR, Krasnoyarsk Territory and Krasnoyarsk Regional Fund of Science, project number 20–43–240007 . - ISSN 1998-2836. - ISSN 2313-6049
   Перевод заглавия: Комплекс цефтриаксона с Mg(II): синтез, структура, спектральные и антибактериальные свойства
Кл.слова (ненормированные):
cephalosporin antibiotic -- ceftriaxone -- magnesium -- density functional theory -- molecular spectroscopy -- antibacterial screening -- цефалоспориновые антибиотики -- цефтриаксон -- магний -- теория функционала плотности -- молекулярная спектроскопия -- антибактериальный скрининг
Аннотация: Magnesium complex of ceftriaxone was obtained and characterized by atomic-emission and elemental analysis, TGA, FTIR and Raman spectroscopy, X-ray diffraction and density functional theory calculations. Ceftriaxone was coordinated to the magnesium ion by the oxygen of the triazine cycle in the 6th position, the nitrogen of the amine group of the thiazole ring, and oxygen atoms of the lactam carbonyl and carboxylate groups. The disodium salt of ceftriaxone and magnesium complex were screened for antibacterial activity against Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa.
Получен и охарактеризован магниевый комплекс цефтриаксона методами атомно-эмиссионного и элементного анализов, ТГА, ИК- и КР‑спектроскопии, РФА и расчетов теории функционала плотности. Цефтриаксон координируется к иону магния через кислород триазинового цикла в шестом положении, азот аминогруппы тиазольного цикла и атомы кислорода карбоксильной и лактамной групп. Динатриевая соль цефтриаксона и комплекс магния были исследованы на антибактериальную активность в отношении Staphylococcus aureus, Escherichia coli и Pseudomonas aeruginosa.

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Держатели документа:
Siberian Federal University, Krasnoyarsk, Russian Federation
L.V. Kirensky Institute of Physics SB RAS Federal Research Center "Krasnoyarsk Science Center SB RAS", Krasnoyarsk, Russian Federation
Scientific Research Institute of Medical Problems of the North Federal Research Center “Krasnoyarsk Scientific Center of the SB RAS”, Krasnoyarsk, Russian Federation
Institute of Chemistry and Chemical Technology SB RAS Federal Research Center "Krasnoyarsk Scientific Center of the SB RAS", Krasnoyarsk, Russian Federation

Доп.точки доступа:
Novikova, G. V.; Tsyplenkova, D. I.; Kuzubov, A. A.; Кузубов, Александр Александрович; Kolenchukova, O. A.; Samoilo, A. S.; Vorobyev, S. A.

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    Core-shell Nanosize Particles Mg@Ni: Synthesis and Properties / G. N. Churilov [et al.] // J. Sib. Fed. Univ. Math. Phys. - 2019. - Vol. 12, Is. 1. - P. 28-35 ; Журнал СФУ. Математика и физика, DOI 10.17516/1997-1397-2019-12-1-28-35. - Cited References: 12 . - ISSN 1997-1397. - ISSN 2313-6022
   Перевод заглавия: Наночастицы Mg@Ni, их получение и свойства

РУБ Mathematics

Кл.слова (ненормированные):
core-shell -- nanopartials -- nickel-magnesium -- synthesis in plasma -- surface coating -- частицы ядро–оболочка -- наночастицы -- никель-магниевые частицы -- плазмохимический синтез -- покрытие поверхности частицы
Аннотация: In this paper, we study particles with metallic core (magnesium) - metal shell (nickel) structure, synthesized in metal-containing plasma of high frequency arc discharge. X-ray diffraction analysis, X-ray fluorescence analysis and scanning electron microscopy show that the particles have a uniform nickel shell, which is also indirectly confirmed by comparing the results of hydrogenation of Mg and Mg@Ni particles. Measurement of volume magnetization indicates that shell thickness of most particles is not more than 22 nm.
В данной работе исследованы частицы со структурой металлическое ядро (магний) - металлическая оболочка (никель), полученные в металлсодержащей высокочастотной плазме дугового разряда. Методами рентгенофазового анализа, рентгенофлуоресцентного анализа, сканирующей электронной микроскопии показано, что частицы имеют сплошную никелевую оболочку, что также косвенно подтверждается сравнением результатов гидрирования частиц Mg и Mg@Ni. С помощью измерений объемной намагниченности установлено, что наибольшая часть частиц имеет толщину оболочек не более 22 нм.

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Держатели документа:
Siberian Fed Univ, Svobodny 79, Krasnoyarsk 660041, Russia.
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Akademgorodok 50-38, Krasnoyarsk 660036, Russia.
SB RAS, Krasnoyarsk Sci Ctr, Akademgorodok 50, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Churilov, G. N.; Чурилов, Григорий Николаевич; Nikolaev, N. S.; Николаев, Никита Сергеевич; Osipova, I. V.; Осипова, Ирина Владимировна; Cherepakhin, A. V.; Черепахин, Александр Владимирович; Nemtsev, I. V.; Немцев, Иван Васильевич; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Andyuseva, V. G.; Андюсева, Валентина Г.

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Density-functional model cluster studies of EPR g tensors of F-s(+) centers on the surface of MgO / C. . Di Valentin [et al.] // J. Chem. Phys. - 2006. - Vol. 124, Is. 4. - Ст. 44708, DOI 10.1063/1.2161190. - Cited References: 37 . - ISSN 0021-9606

РУБ Physics, Atomic, Molecular & Chemical
Рубрики:
ELECTRONIC G-TENSORS
   CORRELATION-ENERGY
   MGO(001) SURFACE
   OXYGEN VACANCIES
   SPIN-ORBIT
   G-VALUES
   ATOMS
   APPROXIMATION
   COMPLEXES
   MOLECULES
Кл.слова (ненормированные):
Density-functional model cluster -- Single-crystalline thin films -- Spin-orbit interaction -- Anisotropy -- Paramagnetic resonance -- Single crystals -- Tensors -- Thin films -- Magnesium compounds
Аннотация: We report g tensors of surface color centers, so-called F-s(+) centers, of MgO calculated with two density-functional approaches using accurately embedded cluster models. In line with recent UHV measurements on single-crystalline MgO film, we determined only small g-tensor anisotropies and negative shifts Delta g equivalent to g-g(e) for all F-s(+) sites considered, namely, (001)-terrace, step, edge, and corner sites. The g values are very sensitive to the local structure of the defect: relaxation reverses the sign of Delta g. However, accounting for the spin-orbit interaction either self-consistently or perturbatively yields very similar results. In addition to the values of the tensor components, their direction with respect to the surface was determined. In contrast to edges, significant deviations from ideal C-2v symmetry were found for F-s(+) centers at steps. Recent data on single-crystalline thin films are reevaluated in the light of these results. (c) 2006 American Institute of Physics.

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Держатели документа:
ICREA, Barcelona 08010, Spain
Univ Barcelona & Parc Cientif Barcelona, Dept Quim Fis, Barcelona 08028, Spain
Univ Barcelona & Parc Cientif Barcelona, Ctr Especial Recerca Quim Teor, Barcelona 08028, Spain
Max Planck Gesell, Fritz Haber Inst, Dept Phys Chem, D-14195 Berlin, Germany
Russian Acad Sci, Inst Chem & Chem Technol, Krasnoyarsk 660049, Russia
Univ Milan Bicocca, Dipartimento Sci Mat, I-20125 Milan, Italy
Tech Univ Munich, Dept Chem Theoret Chem, D-85747 Garching, Germany
ИХХТ СО РАН
Dipartimento di Scienza dei Materiali, Universit? degli Studi Milano-Bicocca, 20125 Milano, Italy
Institucio Catalana de Recerca i Estudis Avanats (ICREA), 08010 Barcelona, Spain
Departament de Quimica Fisisca, Centre Especial de Recerca en Quimica Teorica, Parc Cientific de Barcelona, 08028 Barcelona, Spain
Fritz-Haber Institut, Max-Planck Gesellschaft, Department of Chemical Physics, Faradayweg 4-6, D-14195 Berlin, Germany
Institute of Chemistry and Chemical Technology, Russian Academy of Sciences, 660049 Krasnoyarsk, Russian Federation
Department Chemie, Theoretische Chemie, Technische Universitat Munchen, 85747 Garching, Germany

Доп.точки доступа:
Di Valentin, C.; Neyman, K. M.; Risse, T.; Sterrer, M.; Fischbach, E.; Freund, H. J.; Nasluzov, V. A.; Pacchioni, G.; Rosch, N.
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    Facile synthesis and selected characteristics of two-dimensional material composed of iron sulfide and magnesium-based hydroxide layers (tochilinite) / Yu. L. Mikhlin, R. V. Borisov, M. N. Likhatski [et al.] // New J. Chem. - 2023. - Vol. 47, Is. 25. - P. 11869-11881, DOI 10.1039/D3NJ00758H. - Cited References: 97. - This research was financially supported by the Russian Science Foundation, project 22-13-00321 . - ISSN 1144-0546. - ISSN 1369-9261
   Перевод заглавия: Синтез и некоторые характеристики двумерного материала, состоящего из слоев сульфида железа и гидроксида на основе магния (точилинит)
Аннотация: We report here a simple hydrothermal synthesis of 100–200 nm flakes of tochilinite (Fe1−xS)·n(Mg,Fe)(OH)2 constructed by interchanging atomic sulfide and hydroxide sheets as a representative of a new platform of multifunctional two-dimensional materials. The reliable formation of tochilinites was ensured by an excess of sodium sulfide, with the assembly of the metal sulfide and hydroxide sheets driven by their opposite electric charges. X-ray photoelectron spectroscopy found that the hydroxide layers involved Fe3+ cations from 10 to 40% of total iron tuned by addition of Al and Li entering the layers; the Fe1−xS sheets comprised comparable amounts of high-spin Fe3+ and Fe2+ centers, and minor S–S bonding. The room-temperature Mössbauer spectra fitted with several doublets (chemical shift of 0.35–0.4 mm s−1 and varying quadrupole splitting) transformed to three six-line patterns (hyperfine fields of ∼290, 350 and 480 kOe) due to magnetic ordering at 4.2 K, albeit the paramagnetic behavior observed in SQUID experiments. A series of UV-vis absorption maxima were explained in terms of both the high-index all-dielectric Mie resonance, in line with the permittivity measurement data, and the ligand-metal charge transfer resembling that in Fe–S clusters in proteins. Prospective properties and applications of the materials are discussed.

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Держатели документа:
Institute of Chemistry and Chemical Technology, Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences, Akademgorodok, 50/24, Krasnoyarsk, Russia
Kirensky Institute of Physics, Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences, Akademgorodok 50/38, Krasnoyarsk, Russia
Siberian Federal University, Svobodny av. 79, Krasnoyarsk, Russia

Доп.точки доступа:
Mikhlin, Yuri L.; Borisov, Roman V.; Likhatski, Maxim N.; Bayukov, O. A.; Баюков, Олег Артемьевич; Knyazev, Yu. V.; Князев, Юрий Владимирович; Zharkov, S. M.; Жарков, Сергей Михайлович; Vorobyev, Sergey A.; Tomashevich, Yevgeny V.; Ivaneeva, Anastasiya D.; Karacharov, Anton A.; Karpov, Denis V.; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Rautskii, M. V.; Рауцкий, Михаил Владимирович; Smolyakov, D. A.; Смоляков, Дмитрий Александрович; Tarasov, A. S.; Тарасов, Антон Сергеевич
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Fedorov, A. S.
Analysis of hydrogen adsorption in the bulk and on the surface of magnesium nanoparticles / A. S. Fedorov, M. V. Serzhantova, A. A. Kuzubov // J. Exp. Theor. Phys. - 2008. - Vol. 107, Is. 1. - P. 126-132, DOI 10.1134/S1063776108070121. - Cited References: 15. - This study was supported financially by the Russian Foundation for Basic Research ( project no. 06-02-16132). The authors are also grateful to the Institute of Computer Modeling of the Siberian Branch of the Russian Academy of Science for providing a cluster computer on which all quantum-chemistry calculations were performed. . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
MOLECULAR-DYNAMICS
TRANSITION
METALS
Кл.слова (ненормированные):
Adsorption -- Gas adsorption -- Hydrogen -- Light metals -- Magnesium -- Nonmetals -- Hydrogen adsorption -- Magnesium hydrides -- Magnesium printing plates
Аннотация: The stability of magnesium hydride (MgH (x) ) nanoparticles (x = 0.5,...,2) is investigated using ab initio calculations. It is shown that for a nanoparticle diameter of D similar to 5 nm, the internal pressure becomes lower than 3 kbar; for this reason, the structure of hydride nanoparticles coincides with the structure of this hydride in crystalline form. It is found that the phase of partly saturated MgH (x) hydrides (x < 2) must decompose into the phase of pure hcp magnesium and the alpha phase of MgH(2). The frequencies of jumps of hydrogen atoms within the hcp phase of magnesium and in the alpha phase of MgH(2) are calculated; it is shown that slow diffusion of hydrogen in magnesium is due to the large height of potential barriers for motion of hydrogen within MgH(2). To attain high diffusion rates, the structures of Mg(53)Sc and Mg(53)Ti crystals and their hydrides are calculated. It is found that the frequency of jumps of H atoms in Mg(53)ScH(108) near the Sc atoms does not noticeably change as compared to the frequency of jumps in the alpha phase of MgH(2), while the frequency of jumps in Mg(53)TiH(108) near Ti atoms is higher by approximately a factor of 2.5 x 10(6). This means that diffusion in manganese hydride with small admixtures of titanium atoms must be considerably eased. Chemical dissociation of hydrogen molecules on the (0001) surface of hcp magnesium, on the given surface with adjoined individual Ti atoms, and on the surface of a one-layer titanium cluster on the given surface of magnesium is investigated. It is found that dissociation of hydrogen at solitary titanium atoms, as well as on the surface of a Ti cluster, is facilitated to a considerable extent as compared to pure magnesium. This should also sharply increase the hydrogen adsorption rate in magnesium nanoparticles.

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Держатели документа:
[Fedorov, A. S.
Kuzubov, A. A.] Russian Acad Sci, Siberian Branch, Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
[Serzhantova, M. V.
Kuzubov, A. A.] Siberian Fed Univ, Krasnoyarsk 660028, Russia
ИФ СО РАН
Kirenskii Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Akademgorodok, Krasnoyarsk, 660028, Russian Federation

Доп.точки доступа:
Serzhantova, M. V.; Kuzubov, A. A.; Кузубов, Александр Александрович; Федоров, Александр Семенович
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Hydrogenation of the Nanopowders That Form in a Carbon-Helium Plasma Stream during the Introduction of Ni and Mg / G. N. Churilov [et al.] // J. Exp. Theor. Phys. - 2011. - Vol. 113, Is. 6. - P. 1057-1062, DOI 10.1134/S1063776111140135. - Cited References: 9. - This work was supported by the Russian Foundation for Basic Research, project no. 09-03-00383-a. . - ISSN 1063-7761

РУБ Physics, Multidisciplinary

Кл.слова (ненормированные):
Carbon atoms -- Composite nanoparticles -- High temperature -- Hydrogen absorption -- Hydrogen atoms -- Island growth -- Magnesium hydride -- Magnesium surface -- Nano powders -- Nickel atoms -- Plasma streams -- Atoms -- Carbon -- Composite materials -- Density functional theory -- Electron beams -- Helium -- Hydrogen -- Hydrogenation -- Nanoparticles -- Nickel -- Scanning electron microscopy -- Thermogravimetric analysis -- X ray photoelectron spectroscopy -- Magnesium
Аннотация: Composite nanoparticles consisting of magnesium, nickel, and carbon atoms are studied both theoretically and experimentally. The calculations performed in terms of the density functional theory show that the jump frequency of hydrogen atoms in nickel-containing magnesium hydride increases substantially near impurity nickel atoms; as a result, the rate of hydrogen absorption by magnesium also increases. Nickel on the magnesium surface is shown to be absorbed via an island growth mechanism. Composite Mg-C, Ni-C, and Mg-Ni-C powders are produced by plasmachemical synthesis in a carbon-helium plasma stream. Hydrogen is introduced into a chamber during synthesis. It is found by X-ray photoelectron spectroscopy and thermogravimetric analysis that, among these three composites, only Mg-Ni-C contains magnesium fixed in the MgH2 compound. The process of such "ultrarapid" hydrogenation of magnesium, which occurs in the time of formation of composite nanoparticles, can be explained by the catalytic action of nickel, which is enhanced by a high temperature. Scanning electron microscopy micrographs demonstrate the dynamics of the dehydrogenation of Mg-Ni-C composite nanoparticles in heating by an electron beam.

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Держатели документа:
[Churilov, G. N.
Osipova, I. V.
Glushchenko, G. A.
Fedorov, A. S.
Popov, Z. I.
Cherepakhin, A. V.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Tomashevich, Ye. V.
Vereshchagin, S. N.
Zhizhaev, A. M.] Russian Acad Sci, Siberian Branch, Inst Chem & Chem Technol, Krasnoyarsk 660049, Russia
[Bulina, N. V.] Russian Acad Sci, Siberian Branch, Inst Solid State Chem & Mechanochem, Novosibirsk 630128, Russia
ИФ СО РАН
ИХХТ СО РАН
Kirensky Institute of Physics, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk, 660036, Russian Federation
Institute of Chemistry and Chemical Technology, Siberian Branch, Russian Academy of Sciences, ul. K. Marksa 42, Krasnoyarsk, 660049, Russian Federation
Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch, Russian Academy of Sciences, ul. Kutateladze 18, Novosibirsk, 630128, Russian Federation

Доп.точки доступа:
Churilov, G. N.; Чурилов, Григорий Николаевич; Osipova, I. V.; Осипова, Ирина Владимировна; Tomashevich, Y. V.; Томашевич, Евгений Владимирович; Glushchenko, G. A.; Глущенко, Гарий Анатольевич; Fedorov, A. S.; Федоров, Александр Семенович; Popov, Z. I.; Попов, Захар Иванович; Bulina, N. V.; Булина, Наталья Васильевна; Vereshchagin, S. N.; Zhizhaev, A. M.; Cherepakhin, A. V.; Черепахин, Александр Владимирович
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10.

    In situ X-ray diffraction study of chrysotile at high P–T conditions: transformation to the 3.65 Å phase / S. V. Goryainov, J. S. Tse, S. Desgreniers [et al.] // Phys. Chem. Miner. - 2021. - Vol. 48, Is. 10. - Ст. 36, DOI 10.1007/s00269-021-01160-8. - Cited References: 68. - This work was performed under the auspicious of the state assignment of IGM SB RAS supported by Ministry of Science and Higher Education of the Russian Federation. The Russian Foundation for Basic Research (project no.21-55-14001) is gratefully acknowledged. Authors thank S.V. Rashchenko for fruitful discussion on XRD diffraction patterns of the talc-water system. We thank SPring-8 Synchrotron Radiation Facilities and BLXU-10 beamline for providing the synchrotron beam-time. JST, SD and YP would like to thank Natural Science and Engineering Council Canada for the award of individual Discovery Grants . - ISSN 0342-1791. - ISSN 1432-2021
   Перевод заглавия: Рентгеноструктурное исследование хризотила в условиях высоких P – T: превращение в фазу 3,65 Å

РУБ Materials Science, Multidisciplinary + Mineralogy
Рубрики:
HIGH-PRESSURE STABILITY
HYDROUS MAGNESIUM SILICATES
SYSTEM MGO-SIO2-H2O MSH
Кл.слова (ненормированные):
Chrysotile -- Serpentine -- High pressure -- High temperature -- X-ray diffraction -- Synchrotron radiation
Аннотация: The behavior of chrysotile Mg3(Si2O5)(OH)4 in water medium at simultaneously high pressure and high temperature was studied by in situ synchrotron X-ray diffraction using a diamond anvil cell. In contrast to previous ‘dry’ experiments, chrysotile in water-saturated conditions undergoes two-phase transitions and exhibits higher thermal stability. At 260 °C / 3.7 GPa the initial chrysotile (phase I) transforms to the ‘chrysotile-like’ phase II, followed by the appearance of the ‘chrysotile-like’ phase III at 405 °C / 5.25 GPa. Phase III is characterized by enlarged interlayer distances, presumably resulting from the H2O intercalation into the interlayer space. During further compression, the ‘chrysotile-like’ phase III is decomposed to the 10 Å phase Mg3(Si4O10)(OH)2·xH2O, the 3.65 Å phase MgSi(OH)6, phase D, forsterite, enstatite and coesite or stishovite. The 3.65 Å phase appears at 8.8 GPa / 500 °C. The series of transformations leads to a water deficiency in the system, restricting the complete transformation from the 10 Å phase to the 3.65 Å phase. These data emphasize the crucial role of excess water in the stabilization of the high-pressure hydrous phases. The present study is the first in situ observation of sequential transformations of hydrous phases: serpentine → 10 Å phase → 3.65 Å phase, important as a potential water transport mechanism to the deep mantle.

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Держатели документа:
Russian Acad Sci, Sobolev Inst Geol & Mineral, Siberian Branch, Pr Koptyug 3, Novosibirsk 630090, Russia.
Univ Saskatchewan, Dept Phys, 116 Sci Pl, Saskatoon, SK S7N 5B2, Canada.
Univ Ottawa, Dept Phys, 150 Louis Pasteur, Ottawa, ON K1N 6N5, Canada.
Japan Synchrotron Radiat Res Inst, 1-1-1 Kouto, Sayo, Hyogo 6795198, Japan.
Univ Saskatchewan, Dept Geol Sci, 114 Sci Pl, Saskatoon, SK S7N 5E2, Canada.
Novosibirsk State Univ, Pirogov Str 1, Novosibirsk 630090, Russia.
FRC KSC SB RAS, Lab Crystal Phys, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Kemerovo State Univ, Res & Dev Dept, Kemerovo 650000, Russia.

Доп.точки доступа:
Goryainov, Sergey, V; Tse, John S.; Desgreniers, Serge; Kawaguchi, Saori, I; Pan, Yuanming; Likhacheva, Anna Yu; Molokeev, M. S.; Молокеев, Максим Сергеевич; Ministry of Science and Higher Education of the Russian Federation; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [21-55-14001]; Natural Science and Engineering Council CanadaNatural Sciences and Engineering Research Council of Canada (NSERC)
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