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Wüstite stability in the presence of a CO2-fluid and a carbonate-silicate melt: Implications for the graphite/diamond formation and generation of Fe-rich mantle metasomatic agents / Y. V. Bataleva [et al.] // Lithos. - 2016. - Vol. 244. - P. 20-29, DOI 10.1016/j.lithos.2015.12.001. - Cited References: 68. - This work was supported by the Russian Science Foundation under grant no. 14-27-00054. The authors thank A. Moskalev for his assistance in the work preparation, A. Khokhryakov for useful suggestions throughout the study, and S. Ovchinnikov for his assistance in implementation of Mössbauer spectroscopy measurements. The authors thank editor M. Scambelluri, and two anonymous reviewers for their useful comments, which helped to profoundly improve the manuscript. . - ISSN 0024-4937

РУБ Geochemistry & Geophysics + Mineralogy
Рубрики:
EARTHS LOWER MANTLE
   FERRIC IRON CONTENT
   DIAMOND FORMATION
   MINERAL INCLUSIONS
   NATURAL DIAMOND
   OXIDATION-STATE
   DEEP MANTLECRUST
   LITHOSPHERIC MANTLE
   OXYGEN FUGACITY
   OCEANIC-CRUST
Кл.слова (ненормированные):
Wustite -- CO2-fluid -- Carbonate-silicate melt -- Decarbonation -- Graphite formation -- HPHT experiment
Аннотация: Experimental simulation of the interaction of wüstite with a CO2-rich fluid and a carbonate-silicate melt was performed using a multianvil high-pressure split-sphere apparatus in the FeO-MgO-CaO-SiO2-Al2O3-CO2 system at a pressure of 6.3GPa and temperatures in the range of 1150°C-1650°C and with run time of 20h. At relatively low temperatures, decarbonation reactions occur in the system to form iron-rich garnet (Alm75Prp17Grs8), magnesiowüstite (Mg#≤0.13), and CO2-rich fluid. Under these conditions, magnesiowüstite was found to be capable of partial reducing CO2 to C0 that leads to the formation of Fe3+-bearing magnesiowüstite, crystallization of magnetite and metastable graphite, and initial growth of diamond seeds. At T≥1450°C, an iron-rich carbonate-silicate melt (FeO~56wt.%, SiO2~12wt.%) forms in the system. Interaction between (Fe,Mg)O, SiO2, fluid and melt leads to oxidation of magnesiowüstite and crystallization of fayalite-magnetite spinel solid solution (1450°C) as well as to complete dissolution of magnesiowüstite in the carbonate-silicate melt (1550°C-1650°C). In the presence of both carbonate-silicate melt and CO2-rich fluid, dissolution (oxidation) of diamond and metastable graphite was found to occur. The study results demonstrate that under pressures of the lithospheric mantle in the presence of a CO2-rich fluid, wüstite/magnesiowüstite is stable only at relatively low temperatures when it is in the absolute excess relative to CO2-rich fluid. In this case, the redox reactions, which produce metastable graphite and diamond with concomitant partial oxidation of wüstite to magnetite, occur. Wüstite is unstable under high concentrations of a CO2-rich fluid as well as in the presence of a carbonate-silicate melt: it is either completely oxidized or dissolves in the melt or fluid phase, leading to the formation of Fe2+- and Fe3+-enriched carbonate-silicate melts, which are potential metasomatic agents in the lithospheric mantle. © 2015 Elsevier B.V.

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Держатели документа:
Sobolev Institute of Geology and Mineralogy, Siberian Branch of Russian Academy of Sciences, Koptyug ave 3, Novosibirsk, Russian Federation
Novosibirsk State University, Pirogova str 2, Novosibirsk, Russian Federation
Kirensky Institute of Physics, Siberian Branch of Russian Academy of Sciences, Akademgorodok 50, bld. 38, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Bataleva, Yu. V.; Palyanov, Y .N.; Sokol, A. G.; Borzdov, Y. M.; Bayukov, O. A.; Баюков, Олег Артемьевич
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Unique Nanomechanical Properties of Diamond-Lonsdaleite Biphases: Combined Experimental and Theoretical Consideration of Popigai Impact Diamonds / W. Baek [et al.] // Nano Lett. - 2019. - Vol. 19, Is. 3. - P. 1570-1576, DOI 10.1021/acs.nanolett.8b04421. - Cited References: 38. - The authors thank Dr. Valentin Afanasiev (Sobolev Institute of Geology and Mineralogy, Novosibirsk, Russia) for giving us access to a representative set of impact diamonds from Popigai astrobleme. The authors also acknowledge ID-15B beamline at the European Synchrotron Radiation Facility (ESRF) for providing measurement times and technical support. Dr. Valerio Cerantola (ESRF) is thanked for his kind support with the laser-heating setup. W.B., A.V.K., and P.V.A. acknowledge the National Research Foundation of Republic of Korea for support under grant no. NRF-2017R1A2B4001410. . - ISSN 1530-6984. - ISSN 1530-6992

РУБ Chemistry, Multidisciplinary + Chemistry, Physical + Nanoscience & Nanotechnology + Materials Science, Multidisciplinary + Physics, Applied + Physics, Condensed Matter
Рубрики:
CARBON
   PRESSURES
   GRAPHITE
   HARDNESS
   ORIGIN
Кл.слова (ненормированные):
Impact diamonds -- lonsdaleite -- compressibility -- high-pressure -- diamond/lonsdailete biphases
Аннотация: For the first time, lonsdaleite-rich impact diamonds from one of the largest Popigai impact crater (Northern Siberia) with a high concentration of structural defects are investigated under hydrostatic compression up to 25 GPa. It is found that, depending on the nature of a sample, the bulk modulus for lonsdaleite experimentally obtained by X-ray diffraction in diamond-anvil cells is systematically lower and equal to 93.3–100.5% of the average values of the bulk moduli of a diamond matrix. Density functional theory calculations reveal possible coexistence of a number of diamond/lonsdaleite and twin diamond biphases. Among the different mutual configurations, separate inclusions of one lonsdaleite (001) plane per four diamond (111) demonstrate the lowest energy per carbon atom, suggesting a favorable formation of single-layer lonsdaleite (001) fragments inserted in the diamond matrix. Calculated formation energies and experimental diamond (311) and lonsdaleite (331) powder X-ray diffraction patterns indicate that all biphases could be formed under high-temperature, high-pressure conditions. Following the equation of states, the bulk modulus of the diamond (111)/lonsdaleite (001) biphase is the largest one among all bulk moduli, including pristine diamond and lonsdaleite.

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Держатели документа:
Kyungpook Natl Univ, Dept Chem, 80 Daehak Ro, Daegu 41566, South Korea.
Kyungpook Natl Univ, Greennano Mat Res Ctr, 80 Daehak Ro, Daegu 41566, South Korea.
Novosibirsk State Univ, Dept Phys, Pirogova Str 2, Novosibirsk 630090, Russia.
Nikolaev Inst Inorgan Chem SB RAS, Dept Crystal Chem, Lavrentiev Ave 3, Novosibirsk 630090, Russia.
Siberian Fed Univ, 79 Svobodniy Pr, Krasnoyarsk 660041, Russia.
ESRF European Synchrotron, 71 Ave Martyrs, F-38000 Grenoble, France.
Tomsk State Univ, 36 Lenin Prospekt, Tomsk 634050, Russia.
BAM Fed Inst Mat Res & Testing, Richard Willstatter Str 11, D-12489 Berlin, Germany.
Kirensky Inst Phys, Fed Res Ctr KSC SB RAS, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Baek, Woohyeon; Gromilov, Serey A.; Kuklin, Artem, V; Kovaleva, Evgenia A.; Fedorov, A. S.; Федоров, Александр Семенович; Sukhikh, Alexander S.; Hanfland, Michael; Pomogaev, Vladimir A.; Melchakova, Iuliia A.; Avramov, P. V.; Аврамов, Павел Вениаминович; Yusenko, Kirill, V
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Theoretical Study of Vacancies and Adatoms in White Graphene / A. A. Kuzubov [et al.] // JETP Letters. - 2011. - Vol. 93, Is. 6. - P. 335-338, DOI 10.1134/S0021364011060051. - Cited References: 35 . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
HEXAGONAL BORON-NITRIDE
   INITIO MOLECULAR-DYNAMICS
   BRILLOUIN LIGHT-SCATTERING
   BN NANOTUBES
   AB-INITIO
   ELASTIC PROPERTIES
   MONOLAYER
   GRAPHITE
   COMPRESSION
   TRANSITION
Аннотация: The stability of the B and N atomic vacancies and divacancies in an h-BN monolayer deformed by 2 and 4% along one of the axes has been investigated. It has been established that the N atomic vacancies are most stable; their concentration is insignificant and does not affect the properties of white graphene. The number of vacancies depends on the mobility of N and B atoms on the layer surface; therefore, the probability of recombination with the vacancies has been estimated. It has been revealed that the energy barrier for the migration of the B and N adatoms is about 0.23 and 1.23 eV, respectively. In view of such a low barrier for the B adatom, this type of adatoms will quite rapidly move over the surface and recombine with vacancies, in contrast to the N adatoms. Therefore, only nitrogen atom vacancies can exist in the h-BN monolayer grown by the methods, where the adatoms could possibly appear on the surface.

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Держатели документа:
[Kuzubov, A. A.
Serzhantova, M. V.
Kozhevnikova, T. A.] Siberian Fed Univ, Krasnoyarsk 660028, Russia
[Kuzubov, A. A.
Kozhevnikova, T. A.] Siberian State Technol Univ, Krasnoyarsk 660049, Russia
[Kuzubov, A. A.
Fedorov, A. S.
Tomilin, F. N.
Kozhevnikova, T. A.] Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia
[Serzhantova, M. V.] Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
ИФ СО РАН
Siberian Federal University, Krasnoyarsk 660028, Russian Federation
Siberian State Technological University, Krasnoyarsk 660049, Russian Federation
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Siberian State Aerospace University, Krasnoyarsk 660014, Russian Federation

Доп.точки доступа:
Kuzubov, A. A.; Кузубов, Александр Александрович; Serzhantova, M. V.; Fedorov, A. S.; Федоров, Александр Семенович; Tomilin, F. N.; Томилин, Феликс Николаевич; Kozhevnikova, T. A.
}
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The role of rocks saturated with metallic iron in the formation of ferric carbonate-silicate melts: experimental modeling under PT-conditions of lithospheric mantle / Y. V. Bataleva [et al.] // Russ. Geol. Geophys. - 2015. - Vol. 56, Is. 1-2. - P. 143-154, DOI 10.1016/j.rgg.2015.01.008. - Cited References:68. - This work was supported by Integration project 31 from the Siberian Branch of the Russian Academy of Sciences and by grant 12-05-00740 from the Russian Foundation for Basic Research. . - ISSN 1068. - ISSN 1878-030X. -

РУБ Geosciences, Multidisciplinary
Рубрики:
OXYGEN FUGACITY
   DIAMOND FORMATION
   OXIDATION-STATE
   EARTHS MANTLE
Кл.слова (ненормированные):
carbonate-silicate melt -- graphite -- CO2 fluid -- iron carbide -- garnet -- redox gradient -- high-pressure experiment
Аннотация: Experimental modeling of the processes of formation of ferric carbonate-silicate melts through the carbonate-oxide-metal interaction is performed in the (Mg,Ca)CO3-SiO2-Al2O3-Fe0 system at 6.3 and 7.5 GPa and within 1150-1650 °C, using a multianvil high-pressure apparatus of “split-sphere” type (BARS). Two parallel reactions run in the subsolidus region (1150-1450 °C): decarbonation, producing pyrope-almandine (Fe# = 0.40-0.75) and CO2 fluid, and redox interaction between carbonate and Fe0, resulting in the crystallization of iron carbide in assemblage with magnesiowustite (Fe# = 0.75-0.85). It is shown that the reduction of carbonate or CO2 fluid by iron carbide and parallel redox interaction of magnesiowustite with CO2 produce graphite in assemblage with Fe3 + -containing magnesiowustite. In the temperature range of 1450-1650 °C, generation of carbonate-silicate melts coexisting with pyrope-almandine, magnesiowustite, magnetite, ferrospinel, and graphite takes place. The composition of the produced melts is as follows: SiO2 - 10-15 wt.%, X(FeO + Fe2O3) = 36-43 wt.%, and Fe3+/XFe - 0.18-0.23. These Fe3 + -enriched carbonate-silicate melts/fluids are saturated with carbon and are the medium of graphite crystallization. Oxide and silicate phases (almandine, ferrospinel, and magnetite) coexisting with graphite are also characterized by high Fe3+/XFe values. It has been established that Fe3 + -enriched carbonate-silicate melts can result from the interaction of Fe0-containing rocks with carbonated rocks. In the reduced mantle (with the presence of iron carbides or oxides), melts of this composition can be the source of carbon and the medium of graphite crystallization at once. After separation and ascent, these ferric carbonate-silicate melts can favor oxidizing metasomatism in the lithospheric mantle.

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Публикация на русском языке Роль пород, содержащих самородное железо, в образовании железистых карбонатно-силикатных расплавов: экспериментальное моделирование при P-T-параметрах литосферной мантии [Текст] / Ю. В. Баталева [и др.] // Геол. и геофиз. - Новосибирск : Изд-во СО РАН, 2015. - Т. 56 № 1-2. - С. 188-203

Держатели документа:
Russian Acad Sci, Siberian Branch, VS Sobolev Inst Geol & Mineral, Novosibirsk 630090, Russia.
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia.
Novosibirsk State Univ, Novosibirsk 630090, Russia.

Доп.точки доступа:
Bataleva, Yu. V.; Palyanov, Yu. N.; Sokol, A. G.; Borzdov, Yu. M.; Bayukov, O. A.; Баюков, Олег Артемьевич; Siberian Branch of the Russian Academy of Sciences [31]; Russian Foundation for Basic Research [12-05-00740]
}
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The formation of graphite upon the interaction of subducted carbonates and sulfur with metal-bearing rocks of the lithospheric mantle / Y. V. Bataleva [et al.] // Dokl. Earth Sci. - 2016. - Vol. 466, Is. 1. - P. 88-91, DOI 10.1134/S1028334X16010190. - Cited References: 15. - This study was supported by the Russian Science Foundation (project no. 14-27-00054). . - ISSN 1028-334X

РУБ Geosciences, Multidisciplinary
Рубрики:
Diamond formation
Silicon
Iron
Аннотация: Experimental studies of the Fe0–(Mg, Ca)CO3–S system were carried out during 18–20 h at 6.3 GPa, 900–1400°C. It is shown that the major processes resulting in the formation of free carbon include reduction of carbonates upon redox interaction with Fe0 (or Fe3C), extraction of carbon from iron carbide upon interaction with a sulfur melt/fluid, and reduction of the carbonate melt by Fe–S and Fe⎯S–C melts. Reconstruction of the processes of graphite formation indicates that carbonates and iron carbide may be potential sources of carbon under the conditions of subduction, and participation of the sulfur melt/fluid may result in the formation of mantle sulfides. © 2016, Pleiades Publishing, Ltd.

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Публикация на русском языке Образование графита при взаимодействии субдуцированных карбонатов и серы с металлсодержащими породами литосферной мантии [Текст] / Ю. В. Баталева [и др.] // Докл. акад. наук. - Москва : Наука, 2016. - Т. 466 № 3. - С. 331-334

Держатели документа:
Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, pr. Akad. Koptyuga 3, Novosibirsk, Russian Federation
Novosibirsk State University, Novosibirsk, Russian Federation
Kirenskii Institute of Physics, Siberian Branch, Russian Academy of Sciences, pr. Svobodny 79, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Bataleva, Yu. V.; Palyanov, Y. N.; Borzdov, Y. M.; Bayukov, O. A.; Баюков, Олег Артемьевич; Sobolev, N. V.
}
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Synthesis of transition metal coatings using arabinogalactan / S. V. Stolyar, L. A. Chekanova, E. V. Cheremiskina [et al.] // Bull. Russ. Acad. Sci. Phys. - 2022. - Vol. 86, Is. 5. - P. 597-600, DOI 10.3103/S1062873822050264. - Cited References: 19. - The study was supported by the Russian Foundation for Basic Research, the Government of the Krasnoyarsk Territory, and the Krasnoyarsk Regional Science Foundation (project no. 20-43-240003) . - ISSN 1062-8738
Кл.слова (ненормированные):
Alkalinity -- Carbon -- Coatings -- Crystal structure -- Alkaline media -- Arabinogalactan -- Carbon containing -- Chemical compositions -- Chemical deposition -- Crystals structures -- Graphite inclusions -- Ni coating -- Synthesised -- X- ray diffractions -- Transition metals
Аннотация: Carbon-containing transition metal (Fe, Co, Ni) coatings are synthesized via chemical deposition with arabinogalactan. The crystal structure and chemical composition of the coatings are determined. Data from magnetometry and X-ray diffraction show that carbon is not included in the crystal lattice of a metal. Instead, it exists in the form of graphite inclusions. Degradation of arabinogalactan in an alkaline medium on the surface of a galvanic pair is investigated.

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Публикация на русском языке Получение покрытий переходных металлов в присутствии арабиногалактана [Текст] / С. В. Столяр, Л. А. Чеканова, Е. В. Черемискина [и др.] // Изв. РАН. Сер. физич. - 2022. - Т. 86. № 5. - С. 711-715

Держатели документа:
Kirensky Institute of Physics, Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Institute of Chemistry and Chemical Technology, Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Ural Federal University, Yekaterinburg, 620075, Russian Federation

Доп.точки доступа:
Stolyar, S. V.; Столяр, Сергей Викторович; Chekanova, L. A.; Чеканова, Лидия Александровна; Cheremiskina, E. V.; Yaroslavtsev, R. N.; Ярославцев, Роман Николаевич; Taran, O. P.; Borovkova, V. S.; Malyar, Y. N.; Neznakhin, D. S.; Komogortsev, S. V.; Комогорцев, Сергей Викторович
}
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Synthesis and properties of plasma-deposited carbon condensates / G. A. Glushchenko [et al.] // Tech. Phys. Lett. - 2003. - Vol. 29, Is. 11. - P. 933-935, DOI 10.1134/1.1631368. - Cited References: 9 . - ISSN 1063-7850

РУБ Physics, Applied
Рубрики:
GRAPHITE
Аннотация: Structural data, thermal characteristics, and theoretically calculated binding energies are reported for a graphite condensate obtained by carbon deposition from plasma. It is demonstrated that this condensate can be effectively used in self-propagating high-temperature synthesis processes. (C) 2003 MAIK "Nauka/Interperiodica".

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk, Russia
Krasnoyarsk State Tech Univ, Krasnoyarsk, Russia
Russian Acad Sci, Inst Chem & Chem Technol, Siberian Div, Krasnoyarsk, Russia
ИФ СО РАН
ИХХТ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Krasnoyarsk Stt. Tech. University, Krasnoyarsk, Russian Federation
Inst. of Chem./Chemical Technology, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Glushchenko, G. A.; Глущенко, Гарий Анатольевич; Bulina, N. V.; Булина, Наталья Васильевна; Novikov, P. V.; Bondarenko, G. N.; Бондаренко, Галина Николаевна; Churilov, G. N.; Чурилов, Григорий Николаевич
}
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Superlattices consisting of "lines" of adsorbed hydrogen atom pairs on graphene / L. A. Chernozatonskii [et al.] // JETP Letters. - 2007. - Vol. 85, Is. 1. - P. 77-81, DOI 10.1134/S002136400701016X. - Cited References: 25 . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
CARBON NANOTUBES
   ELECTRON-GAS
   GRAPHITE
   FILMS
   PSEUDOPOTENTIALS
Аннотация: The structures and electron properties of new superlattices formed on graphene by adsorbed hydrogen molecules are theoretically described. It has been shown that superlattices of the (n, 0) zigzag type with linearly arranged pairs of H atoms have band structures similar to the spectra of (n, 0) carbon nanotubes. At the same time. superlattices of the (n, n) type with a "staircase" of adsorbed pairs of H atoms are substantially metallic with a high density of electronic states at the Fermi level and this property distinguishes their spectra from the spectra of the corresponding (n, n) nanotubes. The features of the spectra have the Van Hove form, which is characteristic of each individual superlattice. The possibility of using such planar structures with nanometer thickness is discussed.

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Держатели документа:
Russian Acad Sci, Emanuel Inst Biochem Phys, Moscow 119334, Russia
Humboldt Univ, Inst Math, D-12489 Berlin, Germany
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660049, Russia
ИФ СО РАН
Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, ul. Kosygina 4, Moscow, 119334, Russian Federation
Institute of Mathematics, Humboldt University of Berlin, Berlin, 12489, Germany
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660049, Russian Federation

Доп.точки доступа:
Chernozatonskii, L. A.; Sorokin, P. B.; Belova, E. E.; Bruning, J.; Fedorov, A. S.; Федоров, Александр Семенович
}
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    Processes and conditions of the origin for Fe3+-bearing magnesiowustite under lithospheric mantle pressures and temperatures / Y. Bataleva [et al.] // Minerals. - 2019. - Vol. 9, Is. 8. - Ст. 474, DOI 10.3390/min9080474. - Cited References: 82. - This research was performed by state assignment of IGM SB RAS (project No. 0330-2016-0007). . - ISSN 2075-163X
   Перевод заглавия: Процессы и условия зарождения магнезиовюстита, несущего Fe3+, при давлении и температуре литосферной мантии
Рубрики:
Mineral Geochemistry and Geochronology
Кл.слова (ненормированные):
Fe3+-bearing magnesiowustite -- Mantle oxides -- Experimental modeling -- High-pressure experiment -- Redox reactions -- Lithospheric mantle -- Diamond -- Graphite
Аннотация: An experimental study, implicated in the revealing of the conditions for the origin for Fe3+-bearing magnesiowüstite in the lithospheric mantle, was performed using Mössbauer spectroscopy of pre-synthesized samples. Experiments were carried out using a multi-anvil high-pressure split-sphere apparatus at 6.3–7.5 GPa, in the range of 1100–1650 °C in carbonate-metal, carbonate–oxide-metal, carbonate-oxide, carbide-oxide and carbonate–metal-sulphur systems. In three experimental series, oxygen fugacity gradient in the samples was created, which enabled the study of the processes of magnesiowüstite formation under oxidizing and reducing conditions (ΔlogfO2 (FMQ) values from −1 to −5). It was established that Fe3+-bearing magnesiowüstite can form both in assemblage with oxidized phases, such as carbonate or with reduced ones—metal, carbides, sulphides, graphite and diamond. According to the Mössbauer spectroscopy, the composition of synthesized magnesiowüstite varied within a range of Fe3+/ΣFe values from 0 to 0.3, with IV and VI coordination of Fe3+ depending on P, T, fO2, x-parameters. It was established that Fe3+-bearing magnesiowüstite formation processes under upper mantle P,T-conditions include redox reactions, with magnesiowüstite being (1) reductant or (2) product of interaction, (3) crystallization processes of magnesiowüstite from an oxidized melt, where magnesiowüstite acts as a sink for ferric iron and (4) iron disproportionation.

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Держатели документа:
Sobolev Institute of Geology and Mineralogy, Siberian Branch of Russian Academy of Sciences, Koptyug ave 3, Novosibirsk, 630090, Russian Federation
Department of Geology and Geophysics, Novosibirsk State University, Pirogova str 2, Novosibirsk, 630090, Russian Federation
Kirensky Institute of Physics, Siberian Branch of Russian Academy of Sciences, Akademgorodok 50, bld. 38, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Bataleva, Y.; Palyanov, Y.; Borzdov, Y.; Bayukov, O. A.; Баюков, Олег Артемьевич
}
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10.

    Phonon topology and winding of spectral weight in graphite / N. D. Andriushin, A. S. Sukhanov, A. N. Korshunov [et al.] // Phys. Rev. Lett. - 2023. - Vol. 131, Is. 24. - Ст. 246601, DOI 10.1103/PhysRevLett.131.246601. - Cited References: 42. - We thank R. Coldea for stimulating discussions. A. Bosak participated in the discussion and preparation of the experiment. We acknowledge financial support from the Swiss National Science Foundation, from the European Research Council under the grant Hyper Quantum Criticality (HyperQC), the German Research Foundation (DFG) through the Collaborative Research Center SFB 1143 (Project No. 247310070), and from the European Union Horizon 2020 research and innovation program under Marie Skłodowska-Curie Grant No. 884104. We acknowledge the European Synchrotron Radiation Facility (ESRF) for provision of synchrotron radiation facilities . - ISSN 0031-9007. - ISSN 1079-7114
   Перевод заглавия: Топология фононов и модуляция спектрального веса в графите
Аннотация: The topology of electronic and phonon band structures of graphene is well studied and known to exhibit a Dirac cone at the K point of the Brillouin zone. Here, we applied inelastic x-ray scattering (IXS) along with ab initio calculations to investigate phonon topology in graphite, the 3D analog of graphene. We identified a pair of modes that form a very weakly gapped linear anticrossing at the K point that can be essentially viewed as a Dirac cone approximant. The IXS intensity in the vicinity of the quasi-Dirac point reveals a harmonic modulation of the phonon spectral weight above and below the Dirac energy, which was previously proposed as an experimental fingerprint of the nontrivial topology. We illustrate how the topological winding of IXS intensity can be understood in terms of atomic displacements and highlight that the intensity winding is not in fact sensitive in telling quasi- and true Dirac points apart.

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Держатели документа:
Institut fur Festkorper- und Materialphysik, Technische Universitat Dresden, D-01069 Dresden, Germany
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Quantum Criticality and Dynamics Group, Paul Scherrer Institut, CH-5232 Villigen-PSI, Switzerland
Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, CH-5232 Villigen-PSI, Switzerland

Доп.точки доступа:
Andriushin, N. D.; Sukhanov, A. S.; Korshunov, A. N.; Pavlovskii, M. S.; Павловский, Максим Сергеевич; Rahn, M. C.; Nikitin, S. E.
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