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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Podoprigora V. G., Remizov I. A., Shabanov V. F., Shmeleva L. V.
Заглавие : Dynamic and electrooptic parameters of monolayers in ethane adsorbed on graphite
Место публикации : Phys. Status Solidi B. - 1989. - Vol. 155, Is. 1. - P.117-125. - ISSN 0370-1972, DOI 10.1002/pssb.2221550110
Примечания : Cited References: 17
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bataleva Yu. V., Palyanov Y. N., Borzdov Y. M., Bayukov O. A., Zdrokov E. V.
Заглавие : Iron carbide as a source of carbon for graphite and diamond formation under lithospheric mantle P-T parameters
Место публикации : Lithos: Elsevier, 2017. - Vol. 286-287. - P.151-161. - ISSN 00244937 (ISSN), DOI 10.1016/j.lithos.2017.06.010
Примечания : Cited References: 57. - This work was supported by the Russian Foundation for Basic Research (project No. 16-35-60024) and by a State Assignment (project no. 0330-2016-0007). The authors thank the editor Marco Scambelluri, the reviewer Fabrizio Nestola and an anonymous reviewer for their helpful and constructive reviews. The authors thank A. Moskalev and M. Jolivet for their assistance in the work preparation, A. Sokol and A. Khokhryakov for useful suggestions throughout the study, S. Ovchinnikov for his assistance in implementation of the Mössbauer spectroscopy measurements.
Ключевые слова (''Своб.индексиров.''): iron carbide--graphite--diamond--sulfur-rich fluid--mantle sulfides--high-pressure experiment
Аннотация: Experimental modeling of natural carbide-involving reactions, implicated in the graphite and diamond formation and estimation of the iron carbide stability in the presence of S-bearing fluids, sulfide melts as well as mantle silicates and oxides, was performed using a multi-anvil high-pressure split-sphere apparatus. Experiments were carried out in the carbide-sulfur (Fe3C-S), carbide-sulfur-oxide (Fe3C-S-SiO2-MgO) and carbide-sulfide (Fe3C-FeS2) systems, at pressure of 6.3 GPa, temperatures in the range of 900–1600 °C and run time of 18–40 h. During the interaction of cohenite with S-rich reduced fluid or pyrite at 900–1100 °C, extraction of carbon from carbide was realized, resulting in the formation of graphite in assemblage with pyrrhotite and cohenite. At higher temperatures complete reaction of cohenite with newly-formed sulfide melt was found to produce metal-sulfide melt with dissolved carbon (Fe64S27C9 (1200 °C)–Fe54S40C6 (1500 °C), at.%), which acted as a crystallization medium for graphite (1200–1600 °C) and diamond growth on seeds (1300–1600 °C). Reactions of cohenite and oxides with S-rich reduced fluid resulted in the formation of graphite in assemblage with highly ferrous orthopyroxene and pyrrhotite (900–1100 °C) or in hypersthene formation, as well as graphite crystallization and diamond growth on seeds in the Fe-S-C melt (1200–1600 °C). We show that the main processes of carbide interaction with S-rich fluid or sulfide melt are recrystallization of cohenite (900–1100 °C), extraction of carbon and iron in the sulfide melt, and graphite formation and diamond growth in the metal-sulfide melt with dissolved carbon. Our results evidence that iron carbide can act as carbon source in the processes of natural graphite and diamond formation under reduced mantle conditions. We experimentally demonstrate that cohenite in natural environments can be partially consumed in the reactions with mantle silicates and oxides, and is absolutely unstable in the presence of S-bearing reduced fluid or sulfide melt at temperatures higher than 1100 °C, under lithospheric mantle pressures.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ivanenko A. A., Tambasov I. A., Pshenichnaia A. A., Shestakov N. P.
Заглавие : Flexible film broadband absorber based on diamond-graphite mixture and polyethylene
Место публикации : Opt. Mater.: Elsevier Science, 2017. - Vol. 73. - P.388-392. - ISSN 09253467 (ISSN), DOI 10.1016/j.optmat.2017.08.041
Примечания : Cited References: 54. - This study was supported by the Russian Foundation for Basic Research (Grants No. 16-32-00302 мол_а), by the Council for Grants of the President of the Russian Federation (SP-317.2015.1), by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund to the research project No. 16-42-243059 р_мол_а and No. 16-48-242092 р_офи_м.
Ключевые слова (''Своб.индексиров.''): flexible film broadband absorption--diamond-graphite mixture--polyethylene--reflectivity--transmittance
Аннотация: Flexible film broadband absorber based on diamond-graphite mixture and polyethylene was fabricated by hot pressing. The film thickness of the absorber was 90 μm. We have measured angular reflectivity, diffusional reflectivity and transmittance in the range 85–8000 cm−1 (117–1.25 μm) in order to determine the absorption. It was shown that room temperature pressing of mesh print with 250 μm step significantly reduces reflectivity of the absorber. The absorption was over 0.85 in the range 85–320 cm−1 (117–31.25 μm) and 0.98 in the range 320–8000 cm−1 (31.25–1.25 μm). We believe that the designed and manufactured absorber might become a promising material for optical devices where high broadband absorption and flexibility are required.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Glushchenko G. A., Bulina N. V., Novikov P. V., Bondarenko G. N., Churilov G. N.
Заглавие : Synthesis and properties of plasma-deposited carbon condensates
Разночтения заглавия :авие SCOPUS: Synthesis and Properties of Plasma-Deposited Carbon Condensates
Место публикации : Tech. Phys. Lett.: AMER INST PHYSICS, 2003. - Vol. 29, Is. 11. - P.933-935. - ISSN 1063-7850, DOI 10.1134/1.1631368
Примечания : Cited References: 9
Предметные 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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Novikov P. V., Churilov G. N.
Заглавие : Characteristics of the heating dynamics of a graphite conductor taking into account the skin effect
Место публикации : Tech. Phys.: AMER INST PHYSICS, 2000. - Vol. 45, Is. 9. - P1214-1218. - ISSN 1063-7842, DOI 10.1134/1.1318113
Примечания : Cited References: 13
Предметные рубрики: FULLERENES
C-60
SPECTRA
Аннотация: Calculations for a one-dimensional model of RF heating of a cylindrical graphite conductor have been carried out. The heating dynamics are analyzed in the general form. Conductor temperature profiles and the times for heating up to the graphite sublimation temperature as a function of current and frequency have been obtained. A model of conductor heating with partial return of the energy irradiated by the conductor surface has been considered. Frequency and current ranges have been determined to carry out this graphite sublimation method in a chamber with reflecting walls. The problem is associated with carbon vapor production and subsequent synthesis of fullerenes and other carbon structures. (C) 2000 MAIK "Nauka/ Interperiodica".
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Chernozatonskii L. A., Sorokin P. B., Belova E. E., Bruning J., Fedorov A. S.
Заглавие : Metal-semiconductor (semimetal) superlattices on a graphite sheet with vacancies
Место публикации : JETP Letters. - 2006. - Vol. 84, Is. 3. - P.115-118. - ISSN 0021-3640, DOI 10.1134/S0021364006150033
Примечания : Cited References: 25
Предметные рубрики: PSEUDOPOTENTIALS
FILMS
Аннотация: It has been found that periodically closely spaced vacancies on a graphite sheet cause a significant rearrangement of its electronic spectrum: metallic waveguides with a high density of states near the Fermi level are formed along the vacancy lines. In the direction perpendicular to these lines, the spectrum exhibits a semimetal or semiconductor character with a gap where a vacancy miniband is degenerated into impurity levels.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bataleva Y., Palyanov Y., Borzdov Y., Bayukov O. A.
Заглавие : Processes and conditions of the origin for Fe3+-bearing magnesiowustite under lithospheric mantle pressures and temperatures
Место публикации : Minerals. - 2019. - Vol. 9, Is. 8. - Ст.474. - ISSN 2075163X (ISSN), DOI 10.3390/min9080474
Примечания : Cited References: 82. - This research was performed by state assignment of IGM SB RAS (project No. 0330-2016-0007).
Предметные рубрики: Mineral Geochemistry and Geochronology
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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Stolyar S. V., Chekanova L. A., Cheremiskina E. V., Yaroslavtsev R. N., Taran O. P., Borovkova V. S., Malyar Y. N., Neznakhin D. S., Komogortsev S. V.
Заглавие : Synthesis of transition metal coatings using arabinogalactan
Место публикации : Bull. Russ. Acad. Sci. Phys. - 2022. - Vol. 86, Is. 5. - P.597-600. - ISSN 10628738 (ISSN), DOI 10.3103/S1062873822050264
Примечания : 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)
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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Andriushin N. D., Sukhanov A. S., Korshunov A. N., Pavlovskii M. S., Rahn M. C., Nikitin S. E.
Заглавие : Phonon topology and winding of spectral weight in graphite
Колич.характеристики :6 с
Место публикации : Phys. Rev. Lett. - 2023. - Vol. 131, Is. 24. - Ст.246601. - ISSN 00319007 (ISSN), DOI 10.1103/PhysRevLett.131.246601. - ISSN 10797114 (eISSN)
Примечания : 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
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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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bataleva, Yu. V., Palyanov, Yu. N., Borzdov, Yu. M., Novoselov I. D., Bayukov O. A., Sobolev N. V.
Заглавие : Conditions of formation of iron-carbon melt inclusions in garnet and orthopyroxene under P-T conditions of lithospheric mantle
Коллективы : Russian Foundation for Basic Research [16-35-60024]; [0330-2016-0007]
Место публикации : Petrology. - 2018. - Vol. 26, Is. 6. - P.565-574. - ISSN 0869-5911, DOI 10.1134/S0869591118060024. - ISSN 1556-2085(eISSN)
Примечания : Cited References: 45. - This work was supported by the Russian Foundation for Basic Research (project no. 16-35-60024) and a State Assignment (project no. 0330-2016-0007).
Предметные рубрики: EARTHS LOWER MANTLE
DIAMOND FORMATION
DEEP MANTLE
PHYSICOCHEMICAL PARAMETERS
Ключевые слова (''Своб.индексиров.''): high-pressure experiment--metal-carbon melt--graphite--diamond--co2-fluid--mantle silicates--mantle metasomatism
Аннотация: Of great importance in the problem of redox evolution of mantle rocks is the reconstruction of scenarios of alteration of Fe0- or Fe3C-bearing rocks by oxidizing mantle metasomatic agents and the evaluation of stability of these phases under the influence of fluids and melts of different compositions. Original results of high-temperature high-pressure experiments (P = 6.3 GPa, T = 1300–1500°С) in the carbide–oxide–carbonate systems (Fe3C–SiO2–(Mg,Ca)CO3 and Fe3C–SiO2–Al2O3–(Mg,Ca)CO3) are reported. Conditions of formation of mantle silicates with metallic or metal–carbon melt inclusions are determined and their stability in the presence of CO2-fluid representing the potential mantle oxidizing metasomatic agent are estimated. It is established that garnet or orthopyroxene and CO2-fluid are formed in the carbide–oxide–carbonate system through decarbonation, with subsequent redox interaction between CO2 and iron carbide. This results in the formation of assemblage of Fe-rich silicates and graphite. Garnet and orthopyroxene contain inclusions of a Fe–C melt, as well as graphite, fayalite, and ferrosilite. It is experimentally demonstrated that the presence of CO2-fluid in interstices does not affect on the preservation of metallic inclusions, as well as graphite inclusions in silicates. Selective capture of Fe–C melt inclusions by mantle silicates is one of the potential scenarios for the conservation of metallic iron in mantle domains altered by mantle oxidizing metasomatic agents.
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