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    An effect of reduced S-rich fluids on diamond formation under mantle-slab interaction / Y. V. Bataleva [et al.] // Lithos. - 2019. - Vol. 336-337. - P. 27-39, DOI 10.1016/j.lithos.2019.03.027. - Cited References: 73. - This work was supported by the Russian Science Foundation under Grant No. 14-27-00054 and a state assignment of IGM SB RAS. The authors thank S. Ovchinnikov for his assistance in implementation of the Mossbauer spectroscopy measurements. . - ISSN 0024-4937
   Перевод заглавия: Влияние восстановленных S-обогащенных флюидов на образование алмаза при взаимодействии мантиевых плит
Кл.слова (ненормированные):
Sulfur-rich fluid -- Iron carbide -- Diamond -- Mantle sulfides -- High-pressure experiment
Аннотация: Experimental study, dedicated to understanding the effect of S-rich reduced fluids on the diamond-forming processes under subduction settings, was performed using a multi-anvil high-pressure split-sphere apparatus in Fe3C-(Mg,Ca)CO3-S and Fe0-(Mg,Ca)CO3-S systems at the pressure of 6.3 GPa, temperatures in the range of 900–1600 °C and run time of 18–60 h. At the temperatures of 900 and 1000 °C in the carbide-carbonate-sulfur system, extraction of carbon from cohenite through the interaction with S-rich reduced fluid, as well as C0-producing redox reactions of carbonate with carbide were realized. As a result, graphite formation in assemblage with magnesiowüstite, cohenite and pyrrhotite (±aragonite) was established. At higher temperatures (≥1100 °C) formation of assemblage of Fe3+-magnesiowüstite and graphite was accompanied by generation of fO2-contrasting melts - metal-sulfide with dissolved carbon (Fe-S-C) and sulfide-oxide (Fe-S-O). In the temperature range of 1400–1600 °C spontaneous diamond nucleation was found to occur via redox interactions of carbide or iron with carbonate. It was established, that interactions of Fe-S-C and Fe-S-O melts as well as of Fe-S-C melt and magnesiowüstite, were С0-forming processes, accompanied by disproportionation of Fe. These resulted in the crystallization of Fe3+-magnesiowüstite+graphite assemblage and growth of diamond. We show that a participation of sulfur in subduction-related elemental carbon-forming processes results in sharp decrease of partial melting temperatures (~300 °C), reducting the reactivity of the Fe-S-C melt relatively to FeC melt with respect to graphite and diamond crystallization and decrease of diamond growth rate.

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Держатели документа:
Sobolev Institute of Geology and Mineralogy, Mineralogy Siberian Branch of the Russian Academy of Sciences, Academican Koptyug Ave., 3, Novosibirsk, 630090, Russian Federation
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. V.; Palyanov, Y. N.; Borzdov, Y. M.; Novoselov, I. D.; Bayukov, O. A.; Баюков, Олег Артемьевич
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    Lundin, A. A.
    Asymptotic similarity of time correlation functions and shape of the 13C and 29Si NMR spectra in diamond and silicon / A. A. Lundin, V. E. Zobov // J. Exp. Theor. Phys. - 2018. - Vol. 127, Is. 2. - P. 305-315, DOI 10.1134/S1063776118080216. - Cited References: 47. - We thank V.A. Atsarkin, V.V. Demidov, F.S. Dzheparov, and E. B. Feldman for the discussion of our results. This work was supported by a subsidy allocated by the Institute of Chemical Physics of the Russian Academy of Science for the State assignment, theme 0082-2018-0005, code TSITIS AAAA-A18-118020690203. . - ISSN 1063-7761. - ISSN 1090-6509
Рубрики:
SPIN SYSTEMS
   LINE-SHAPES
   RELAXATION
   SOLIDS
   PARAMAGNETS
   RESONANCE
Аннотация: Based on the proposed theory, we have investigated the shape of the NMR absorption spectra for 13C and 29Si nuclei in diamond and silicon crystals attributable to the internuclear dipole–dipole interaction. In accordance with the available experimental data, we have considered both crystals with a 100% content of magnetoactive isotopes and crystals with a comparatively low dilution by nonmagnetic nuclei. The time correlation functions (the first of which is the Fourier transform of the NMR spectrum) arising in an infinite chain of coupled differential equations are shown to be mutually similar with a slight time delay. The proposed theory allows the spectrum to be calculated analytically. The results obtained agree satisfactorily with the experimental ones. It is noted that the mutual similarity of the time correlation functions is probably a corollary of the development of dynamical chaos in the system.

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Публикация на русском языке Лундин, Андрей Арнольдович. Асимптотическое подобие временных корреляционных функций и форма спектров ЯМР 13C и 29Si в алмазе и кремнии [Текст] / А. А. Лундин, В. Е. Зобов // Журн. эксперим. и теор. физ. - 2018. - Т. 154 Вып. 2. - С. 354–367

Держатели документа:
Russian Acad Sci, Semenov Inst Chem Phys, Vorobevskoe Sh 26, Moscow 117977, Russia.
Russian Acad Sci, Kirensky Inst Phys, Fed Res Ctr, Krasnoyarsk Sci Ctr,Siberian Branch, Akademgorodok 50, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Zobov, V. E.; Зобов, Владимир Евгеньевич; Institute of Chemical Physics of the Russian Academy of Science [0082-2018-0005, TSITIS AAAA-A18-118020690203]
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Conditions for diamond and graphite formation from iron carbide at the P-T parameters of lithospheric mantle / Y. V. Bataleva [et al.] // Russ. Geol. Geophys. - 2016. - Vol. 57, Is. 1 : Tectonics, geodynamics, and petrology of earth’s lithosphere and mantle (to the 80th birthday of Academician Nikolai Leontievich Dobretsov). - P. 176-189, DOI 10.1016/j.rgg.2016.01.012. - Cited References:55. - This work was supported by the Russian Science Foundation under Grant No. 14-27-00054. . - ISSN 1068-7971. - ISSN 1878-030X

РУБ Geosciences, Multidisciplinary
Рубрики:
DEEP CARBON-CYCLE
   EARTHS MANTLE
   MINERAL INCLUSIONS
   HIGH-PRESSURE
   KOKCHETAV MASSI
   SUBDUCTION ZONES
   REDOX BUDGET
   FERRIC IRON
   MOSSBAUER
   METAL
Кл.слова (ненормированные):
iron carbide -- wusite -- graphite -- diamond -- oxides -- olivine -- subduction -- redox interaction -- lithospheric mantle -- high-pressure experiment
Аннотация: To estimate conditions for the stability of iron carbide under oxidation conditions and to assess the possibility of formation of elemental carbon by interaction between iron carbide and oxides, experimental modeling of redox interaction in the systems Fe3C-Fe2O3 and Fe3C-Fe2O3-MgO-SiO2 was carried out on a split-sphere high-pressure multianvil apparatus at 6.3 GPa and 900-1600 degrees C for 18-20 h. During carbide-oxide interaction in the system Fe3C-Fe2O3, graphite crystallizes in assemblage with Fe3+-containing wusite. Graphite forms from carbide carbon mainly by cohenite oxidation: Fe3C + 3Fe(2)O(3) -> 9FeO + C-0 and FeO + Fe3C -> (Fe2+, Fe3+)O + C-0. At above-solidus temperatures (>= 1400 degrees C), when metal-carbon melt is oxidized by wusite, graphite and diamond crystallize by the redox mechanism and form the Fe3+-containing wstite + graphite/diamond assemblage. Interaction in the system Fe3C-Fe2O3-MgO-SiO2 results in the formation of Fe3+-containing mannesiowusite-olivine-graphite assemblage. At >= 1500 degrees C, two melts with contrasting f(O2) values are generated: metal-carbon and silicate-oxide; their redox interaction leads to graphite crystallization and diamond growth. Under oxidation conditions, iron carbide is unstable in the presence of iron, silicon, and magnesium oxides, even at low temperatures. Iron carbide-oxide interaction at the mantle temperatures and pressures leads to the formation of elemental carbon; graphite is produced from carbide carbon mainly by redox reactions of cohenite (or metal-carbon melt) with Fe2O3 and FeO as well as by interaction between metal-carbon and silicate-oxide melts. The results obtained suggest that cohenite can be a potential source of carbon during graphite (diamond) formation in the lithospheric mantle and the interaction of iron carbide with iron, silicon, and magnesium oxides, during which carbon is extracted can be regarded as a process of the global carbon cycle. (C) 2016, V.S. Sobolev IGM, Siberian Branch of the RAS. Published by Elsevier B.V. All rights reserved.

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Публикация на русском языке Условия образования графита и алмаза из карбида железа при Р, Т-параметрах литосферной мантии [Текст] / Ю. В. Баталева [и др.] // Геол. и геофиз. - 2016. - Т. 57 № 1. - С. 225-240

Держатели документа:
Russian Acad Sci, Siberian Branch, VS Sobolev Inst Geol & Mineral, Pr Akad Koptyuga 3, Novosibirsk 630090, Russia.
Novosibirsk State Univ, Ul Pirogova 2, Novosibirsk 630090, Russia.
Russian Acad Sci, Siberian Branch, LV Kirensky Inst Phys, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Bataleva, Yu. V.; Palyanov, Yu. N.; Borzdov, Yu. M.; Bayukov, O. A.; Баюков, Олег Артемьевич; Sobolev, N. V.; Russian Science Foundation [14-27-00054]
}
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Conditions of formation of iron-carbon melt inclusions in garnet and orthopyroxene under P-T conditions of lithospheric mantle / Y. V. Bataleva [et al.] // Petrology. - 2018. - Vol. 26, Is. 6. - P. 565-574, DOI 10.1134/S0869591118060024. - 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). . - ISSN 0869-5911. - ISSN 1556-2085

РУБ Geosciences, Multidisciplinary + Mineralogy
Рубрики:
EARTHS LOWER MANTLE
   DIAMOND FORMATION
   DEEP MANTLE
   PHYSICOCHEMICAL PARAMETERS
Кл.слова (ненормированные):
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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Публикация на русском языке Условия образования включений железо-углеродного расплава в гранатах и ортопироксенах при P-T параметрах литосферной мантии [Текст] / Ю. В. Баталева [и др.] // Петрология. - 2018. - Т. 26 № 6. - С. 571-582

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

Доп.точки доступа:
Bataleva, Yu. V.; Palyanov, Yu. N.; Borzdov, Yu. M.; Novoselov, I. D.; Bayukov, O. A.; Баюков, Олег Артемьевич; Sobolev, N. V.; Russian Foundation for Basic Research [16-35-60024]; [0330-2016-0007]
}
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    Diamond anvil cell in high-pressure petrology: studying the metamorphic reactions in situ / S. V. Rashchenko [et al.] // Int. Ecologite Conf. : Abstract Vol. - 2013. - P. 104
   Перевод заглавия: Ячейка с алмазными наковальнями в петрологии высоких давлений: изучение мтаморфных реакций in situ

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Доп.точки доступа:
Rashchenko, S. V.; Likhacheva, A. Y.; Лихачева, Анна Юрьевна; Krylov, A. S.; Крылов, Александр Сергеевич; Mikhno, A. O.; International Eclogite Conference (10 ; 2013 ; Sept. ; 2-10 ; Courmayeur, Italy)
}
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Experimental study of the structure of milled diamond-containing particles obtained by the detonation method / A. Korets [et al.] // EPJ Appl. Phys. - 2012. - Vol. 57, Is. 3. - Ст. 30701, DOI 10.1051/epjap/2012110208. - Cited References: 15 . - ISSN 1286-0042

РУБ Physics, Applied
Рубрики:
PURIFICATION
NANODIAMOND
Кл.слова (ненормированные):
Chemical change -- Diamond grains -- Experimental spectra -- Experimental studies -- IR spectrum -- Mechanical force -- Detonation -- Diamonds -- X ray diffraction -- Agglomeration
Аннотация: A diamond-containing material (DCM) produced by detonation was mechanically milled using KM-1 and AGO-2S mills. Experimental spectra for infrared (IR) absorption, Raman scattering and X-ray diffraction patterns (XRD) were obtained for the treated DCM samples. We compared the Raman and IR spectra for the KM-1 milled samples and concluded that the surface of the DCM particles was not uniform. The mechanical force that resulted from milling with the AGO-2S destroyed the non-diamond part of the particles and initiated irreversible physical and chemical changes in them. The destruction of the diamond grains was the consequence of these irreversible changes. It follows from the experiments that the dipole momentum of the DCM particle was caused by the presence of polar fragments of molecules. The constant dipole momentum of the particles facilitated the aggregation. Based on this, we proposed a model of a structurally inhomogeneous DCM particle. В© 2012 EDP Sciences.

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Держатели документа:
Siberian Federal University, 26, Kirensky Str., Krasnoyarsk 660074, Russian Federation
Institute of Physics, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Institute of Chemistry and Chemical Technology, KSC SB RAS, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Korets, A.; Krylov, A. S.; Крылов, Александр Сергеевич; Mironov, E.; Rabchevskii, E.
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Feature of the endohedral metallofullerene Y@C82 and Gd@C82 polymerization under high pressure / V. V. Zhukov, S. V. Erohin, V. D. Churkin [et al.] // J. Phys. Chem. C. - 2022. - Vol. 126, Is. 40. - P. 17366-17373, DOI 10.1021/acs.jpcc.2c05139. - Cited References: 35. - The authors gratefully acknowledge the financial support of the RFBR (project identifier: 18-29-19080). V.D.C. acknowledges the support of the RFBR (project identifier: 20-32-90038). M.Y.P. acknowledges the support of the Ministry of Science and Higher Education of the Russian Federation in the framework of the State Task (project code 0718-2020-0037) for Raman study, interpretation, and discussion of obtained results and Russian Science Foundation (project #20-12-00097) for investigation of fullerite mechanical properties. V.V.Z., S.V.E., and P.B.S. acknowledge the support of the Ministry of Science and Higher Education of the Russian Federation in the framework of the strategic academic leadership program “Priority 2030” (no. K6-2022-041). The calculations were performed at the supercomputer cluster provided by the Materials Modeling and Development Laboratory at NUST “MISIS” and the Joint Supercomputer Center of the Russian Academy of Sciences. The authors thank the staff of the Information Technology Department of the Moscow Institute of Physics and Technology and express their gratitude to the Data Center Group for their help in performing calculations . - ISSN 1932-7447
Кл.слова (ненормированные):
Fullerenes -- Diamond anvil cell technique -- Endohedral metallofullerenes -- Experimental approaches -- Fullerene cages -- Gadolinia -- High bulk modulus -- High pressure -- Low pressures -- Polymerized material -- Theoretical approach -- Polymerization
Аннотация: In the present work, the polymerization of endohedral metallofullerenes (EMFs) with gadolinium (Gd@C82) and yttrium atoms (Y@C82) at high pressures achieved using the shear diamond anvil cell technique is studied using both theoretical and experimental approaches. It is found that in contrast to pure fullerenes, EMF polymerization starts at lower pressures with similar behavior for both metals inside the fullerene cage. EMF polymerization occurs smoothly and finally leads to a significant increase in the number of interfullerene bonds at pressures higher than ∼20 GPa. Finally, a high bulk modulus of both EMF-polymerized materials is obtained using Raman spectra.

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Держатели документа:
Technological Institute for Superhard and Novel Carbon Materials, Troitsk, Moscow, 108840, Russian Federation
National University of Science and Technology MISiS, Moscow, 119049, Russian Federation
Moscow Institute of Physics and Technology, Dolgoprudniy, Moscow, 141701, Russian Federation
Institute of Engineering Physics and Radio Electronics, Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, Moscow, 119334, Russian Federation
Institute of Chemistry and Chemical Technology, The Siberian Branch of the RAS, Federal Research Center KSC Siberian Branch Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Zhukov, V. V.; Erohin, S. V.; Churkin, V. D.; Vnukova, N. G.; Внукова, Наталья Григорьевна; Antipina, L. Y.; Elesina, V. I.; Елесина, Виктория Игоревна; Visotin, M. A.; Высотин, Максим Александрович; Tomashevich, Y. V.; Popov, M. Y.; Churilov, G. N.; Чурилов, Григорий Николаевич; Sorokin, P. B.; Fedorov, A. S.; Федоров, Александр Семенович
}
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Flexible film broadband absorber based on diamond-graphite mixture and polyethylene / A. A. Ivanenko [et al.] // Opt. Mater. - 2017. - Vol. 73. - P. 388-392, DOI 10.1016/j.optmat.2017.08.041. - 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. . - ISSN 0925-3467
Кл.слова (ненормированные):
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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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC Siberian Branch of Russian Academy of Sciences, Akademgorodok 50, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Ivanenko, A. A.; Иваненко, Александр Анатольевич; Tambasov, I. A.; Тамбасов, Игорь Анатольевич; Pshenichnaia, A. A.; Пшеничная, Анастасия Александровна; Shestakov, N. P.; Шестаков, Николай Петрович
}
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    Graphite and diamond formation in the carbide–oxide–carbonate interactions (Experimental modeling under mantle P,T-conditions) / Y. Bataleva [et al.] // Minerals. - 2018. - Vol. 8, Is. 11. - Ст. 522, DOI 10.3390/min8110522. - Cited References: 67. - The authors express their sincere thanks to the in-house Editor, the guest Academic Editor, and three anonymous Reviewers for helpful and constructive reviews. The authors thank S. Ovchinnikov for his assistance in implementation of Mössbauer spectroscopy measurements and A. Moskalev for his assistance in the work preparation. . - ISSN 2075-163X
   Перевод заглавия: Образование графита и алмаза при взаимодействиях карбид-оксид-карбонат (экспериментальное моделирование в Р,Т-условиях мантии)
Кл.слова (ненормированные):
Cohenite -- Graphite -- Diamond -- CO2 fluid -- Carbonate -- Garnet -- Experiment -- High pressure -- Lithospheric mantle -- Metasomatism
Аннотация: Experimental modeling of the formation of graphite and diamond as a result of carbide–fluid interactions was performed in the Fe3C–SiO2–Al2O3–(Mg,Ca)CO3 systems at 6.3 and 7.5 GPa and 1100–1650 °C. In the experiments with ƒO2-gradient (7.5 GPa, 1250–1350 °C), graphite + magnesiowüstite + garnet ± cohenite assemblage was formed. Graphite was produced through the redox interactions of carbide with carbonate or CO2 (reducing conditions), and redox reactions of magnesiowüstite and CO2 (oxidizing conditions). At 1450–1650 °C, crystallization of graphite, garnet, magnesiowüstite and ferrospinel, as well as generation of Fe2+,3+-rich carbonate–silicate melt occurred. This melt, saturated with carbon, acted as a medium of graphite crystallization and diamond growth on seeds. In the experiments without ƒO2-gradient (6.3 GPa), decarbonation reactions with the formation of CO2-fluid and Fe,Mg,Ca-silicates, as well as C0-producing redox reactions of CO2-fluid with cohenite were simultaneously realized. As a result, graphite (± diamond growth) was formed in assemblage with Fe2+,Fe3+,Mg-silicates and magnetite (1100–1200 °C), or with Fe3+-rich garnet and orthopyroxene (1300–1500 °C). It has been established that a potential mechanism for the crystallization of graphite or diamond growth is the oxidation of cohenite by CO2-fluid to FeO and Fe3O4, accompanied by the extraction of carbon from Fe3C and the corresponding reduction of CO2 to C0.

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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.; Novoselov, I.; Bayukov, O. A.; Баюков, Олег Артемьевич
}
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10.

High-pressure magnetic properties and P-T phase diagram of iron borate / A. G. Gavriliuk [et al.] // J. Exp. Theor. Phys. - 2005. - Vol. 100, Is. 4. - P. 688-696, DOI 10.1134/1.1926429. - Cited References: 24 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
FEBO3 SINGLE-CRYSTALS
   NUCLEAR-RESONANCE
   BAND-STRUCTURE
   TRANSITION
   TEMPERATURE
   SCATTERING
Кл.слова (ненормированные):
Antiferromagnetic materials -- Diamonds -- Ferromagnetic materials -- High pressure effects -- Low temperature effects -- Magnetic moments -- Magnetic properties -- Magnetization -- Phase diagrams -- Powders -- Single crystals -- Synchrotron radiation -- Diamond anvil cells -- Electronic transition -- Iron borate -- Nuclear forward scattering (NFS) -- Iron compounds
Аннотация: The high-pressure magnetic states of iron borate (FeBO3)-Fe-57 single-crystal and powder samples have been investigated in diamond anvil cells by nuclear forward scattering (NFS) of synchrotron radiation at different temperatures. In the low-pressure (0 < P < 46 GPa) antiferromagnetic phase, an increase of the Neel temperature from 350 to 595 K induced by pressure was found. At pressures 46-49 GPa, a transition from the antiferromagnetic to a new magnetic state with a weak magnetic moment (magnetic collapse) was discovered. It is attributed to the electronic transition in Fe3+ ions from the high-spin 3d(5) (S = 5/2, (6)A(1g)) to the low-spin (S = 1/2, T-2(2g)) state (spin crossover) due to the insulator-semiconductor-type transition with extensive suppression of strong d-d electron correlations. At low temperatures, NFS spectra of the high-pressure phase indicate magnetic correlations in the low-spin system with a magnetic ordering temperature of about 50 K. A tentative magnetic P-T phase diagram of FeBO3 is proposed. An important feature of this diagram is the presence of two triple points where magnetic and paramagnetic phases of the high-spin and low-spin states coexist. © 2005 Pleiades Publishing, Inc.

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Держатели документа:
Inst High Pressure Phys, Troitsk 142190, Moscow Oblast, Russia
Russian Acad Sci, Inst Crystallog, Moscow 119333, Russia
Russian Acad Sci, Siberian Div, Kirensky Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Institute for High-Pressure Physics, Troitsk, Moscow oblast, 142190, Russian Federation
Institute of Crystallography, Russian Academy of Sciences, Moscow, 119333, Russian Federation
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Gavriliuk, A. G.; Trojan, I. A.; Lyubutin, I. S.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Sarkissian, V. A.
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