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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Корец, Анатолий Яковлевич, Королькова И. В., Крылов, Александр Сергеевич, Миронов Е. В., Рабчевский Е. В.
Заглавие : Исследование влияния длительной термообработки на детонационный алмазосодержащий материал
Место публикации : Изв. Кабардино-балкарского гос. ун-та. - 2014. - Т. 4, Вып. 3. - С. 74-78
Ключевые слова (''Своб.индексиров.''): детонационный синтез материалов--структурная неоднородность--детонационный алмазосодержащий материал
Аннотация: С целью исследования изменений, происходящих в структуре частиц, полученных в высокоэнергетических условиях взрыва, была произведена термообработка образцов детонационного алмазосодержащего материала в интервале так называемого «кислородного окна» 430 °С. Продолжительность термообработки изменялась от 0,5 часа до 48 часов. Были проведены эксперименты и проанализированы результаты ИК-поглощения, комбинационного рассеяния света, рентгеновской дифракции и динамического рассеяния света термообработанных образцов.Thermal treatment of detonation diamond-containing material in the interval of so-called «oxygen window» 430 C to investigate changes in the structure of the particles obtained under explosion conditions was performed. The duration of the thermal treatment varied from 0.5 to 48 hours. Infrared and Raman experiments and data of X-Ray diffraction and dynamic light scattering of the treatment samples were carried out.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bataleva Yu. V., Palyanov Y .N., Sokol A. G., Borzdov Y. M., Bayukov O. A.
Заглавие : 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
Место публикации : Lithos: Elsevier, 2016. - Vol. 244. - P.20-29. - ISSN 00244937 (ISSN), DOI 10.1016/j.lithos.2015.12.001
Примечания : 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.
Предметные рубрики: EARTHS LOWER MANTLE
FERRIC IRON CONTENT
DIAMOND FORMATION
MINERAL INCLUSIONS
NATURAL DIAMOND
OXIDATION-STATE
DEEP MANTLECRUST
LITHOSPHERIC MANTLE
OXYGEN FUGACITY
OCEANIC-CRUST
Ключевые слова (''Своб.индексиров.''): 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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Baek, Woohyeon, Gromilov, Serey A., Kuklin, Artem, V, Kovaleva, Evgenia A., Fedorov A. S., Sukhikh, Alexander S., Hanfland, Michael, Pomogaev, Vladimir A., Melchakova, Iuliia A., Avramov P. V., Yusenko, Kirill, V
Заглавие : Unique Nanomechanical Properties of Diamond-Lonsdaleite Biphases: Combined Experimental and Theoretical Consideration of Popigai Impact Diamonds
Место публикации : Nano Lett. - 2019. - Vol. 19, Is. 3. - P.1570-1576. - ISSN 1530-6984, DOI 10.1021/acs.nanolett.8b04421. - ISSN 1530-6992(eISSN)
Примечания : 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.
Предметные рубрики: CARBON
PRESSURES
GRAPHITE
HARDNESS
ORIGIN
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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bataleva, Yu. V., Palyanov, Yu. N., Sokol A. G., Borzdov, Yu. M., Bayukov O. A.
Заглавие : The role of rocks saturated with metallic iron in the formation of ferric carbonate-silicate melts: experimental modeling under PT-conditions of lithospheric mantle
Коллективы : Siberian Branch of the Russian Academy of Sciences [31], Russian Foundation for Basic Research [12-05-00740]
Место публикации : Russ. Geol. Geophys.: Elsevier Science, 2015. - Vol. 56, Is. 1-2. - P.143-154. - ISSN 1068, DOI 10.1016/j.rgg.2015.01.008. - ISSN 1878030X(eISSN)
Примечания : 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.
Предметные рубрики: OXYGEN FUGACITY
DIAMOND FORMATION
OXIDATION-STATE
EARTHS MANTLE
Ключевые слова (''Своб.индексиров.''): 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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Вид документа : Однотомное издание
Шифр издания :
Автор(ы) : Isakova V. G., Petrakovskaya E. A., Isakov V. P., Bayukov O. A., Velikanov D. A.
Заглавие : The research of powder fullerene and ultra-despersed diamond composites with metal and oxide nanoparicles
Место публикации : The Physics of Metals and Metallography. - 2006. - Vol. 102, Suppl.1. - С. S57-S60. - DOI 10.1134/S0031918X06140146
Примечания : Библиогр.: 7
Аннотация: Magnetic properties of new nanophase materials based on oxide and metal particles of dtransition metals included in the powder fullerite C60 and detonative ultradispersed diamonds (UDD) are investigated. The materials are obtained by an original method of catalytic combustion reaction.
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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., Sobolev N. V.
Заглавие : The formation of graphite upon the interaction of subducted carbonates and sulfur with metal-bearing rocks of the lithospheric mantle
Место публикации : Dokl. Earth Sci.: MAIK Nauka-Interperiodica / Springer, 2016. - Vol. 466, Is. 1. - P.88-91. - ISSN 1028334X (ISSN), DOI 10.1134/S1028334X16010190
Примечания : Cited References: 15. - This study was supported by the Russian Science Foundation (project no. 14-27-00054).
Предметные 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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Puzir’ A. P., Minakov A. V., Burov A. E., Zharkov S. M., Maksimov N. G., Pryazhnikov M. I.
Заглавие : The effect of silver ions electrolytically introduced into colloidal nanodiamond solution on its viscosity and thermal conductivity
Место публикации : Colloid J.: MAIK Nauka-Interperiodica / Springer, 2017. - Vol. 79, Is. 2. - P.258-263. - ISSN 1061933X (ISSN), DOI 10.1134/S1061933X17020119
Примечания : Cited References: 22
Ключевые слова (''Своб.индексиров.''): dispersions--ions--metal ions--nanodiamonds--nanoparticles--silver--viscosity--a-stable--detonation nanodiamond--diamond nano-particles--effect of silvers--silver concentration--silver ions--thermal conductivity
Аннотация: Experimental data have been presented on the influence of silver on the viscosity and thermal conductivity of a dispersion of diamond nanoparticles. A stable dispersion (5 wt %) of detonation nanodiamond particles has been used in the experiments. Silver ions have been introduced electrolytically into the dispersion of diamond nanoparticles. Silver concentration was not higher than 0.05 wt %. It has been shown that the introduction of silver ions significantly affects the thermal conductivity and viscosity of the dispersion.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Nikolaev N. S., Isakova V. G., Vnukova N. G., Elesina V. I., Glushenko G. A., Tomashevich Y. V., Churilov G. N.
Заглавие : Synthesis of Ni nanoclusters supported on diamond by plasma technique and their electrochemical properties
Колич.характеристики :6 с
Место публикации : Diam. Relat. Mater. - 2024. - Vol. 142. - Ст.110844. - ISSN 09259635 (ISSN), DOI 10.1016/j.diamond.2024.110844. - ISSN 18790062 (eISSN)
Примечания : Cited References: 35
Аннотация: In this study, particles of synthetic undoped diamond (DN) obtained via the high pressure – high temperature method were coated with a nickel shell using metallic nickel plasma in a two-jet plasma generator with gas vortex and magnetic flux stabilization. Through the use of scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy, we observed the formation of a nickel diamond composite with a core-shell structure, where DN serves as the core and Ni nanoclusters form the shell (DN@Ni). The results of voltammetric analysis indicated that DN@Ni, when deposited on a graphite electrode, exhibited significant electrocatalytic activity in the oxidation of methanol and paracetamol in an alkaline electrolyte.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Peng J. L., Bulcock S., Belobrov P. I., Bursill L. A.
Заглавие : Surface bonding states of nano-crystalline diamond balls
Место публикации : Int. J. Mod. Phys. B: WORLD SCIENTIFIC PUBL CO PTE LTD, 2001. - Vol. 15, Is. 31. - P4071-4085. - ISSN 0217-9792, DOI 10.1142/S0217979201007865
Примечания : Cited References: 20
Предметные рубрики: PLASMON RESPONSE
POWDER
SPECTROSCOPY
MICROSCOPY
SILICON
SI(111)
Ключевые слова (''Своб.индексиров.''): diamond--article--crystal structure--electron--energy transfer--nanoparticle--particulate matter--structure analysis--surface property--transmission electron microscopy
Аннотация: The rough surface of nano-crystalline diamond spheres induces surface electronic states which appear as a broadened pre-peak over approx. 15 eV at the C K-edge energy threshold for carbon in the parallel electron energy loss spectrum (PEELS). This appears to be at least partially due to 1s-pi* transitions, although typically the latter occupy a range of only 4 eV for the sp(2) edge of highly-oriented pyrollytic graphite (HOPG). No pi* electrons appear in the conduction band inside the diamond particles, where all electrons are sp(3) hybridized. PEELS data were also obtained from a chemical vapour deposited diamond film (CVDF) and gem-quality diamond for comparison with the spectra of nano-diamonds. The density of sp(2) and sp(3) states on the surface of diamond nano-crystals is calculated for simple structural models of the diamond balls, including some conjecture about surface structures. The results are used to interpret the sp(2)/sp(3) ratios measured from the PEELS spectra recorded as scans across the particles. Surface roughness at the atomic scale was also examined using high-resolution transmission electron microscopy (HRTEM) and electron nano-diffraction patterns were used to confirm the crystal structures.
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10.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Korets A.Ya., Krylov A. S., Mironov E. V.
Заглавие : Structural Inhomogeneity of Detonation Diamond Containing Materials
Коллективы : International Conference on Equations of State for Matter, Physics of Ex treme States of Matter
Место публикации : Physics of extreme states of matter - 2010/ International Conference on Equations of State for Matter, Physics of Ex treme States of Matter (25 ; 2010 ; MAR ; 1-6 ; Elbrus, Russia). - 2010. - С. 33-34. - ISBN 978-5-901675-96-0
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