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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gavriliuk A. G., Trojan I. A., Lyubutin I. S., Ovchinnikov S. G., Sarkissian V. A.
Заглавие : High-pressure magnetic properties and P-T phase diagram of iron borate
Место публикации : J. Exp. Theor. Phys.: AMER INST PHYSICS, 2005. - Vol. 100, Is. 4. - P688-696. - ISSN 1063-7761, DOI 10.1134/1.1926429
Примечания : Cited References: 24
Предметные рубрики: FEBO3 SINGLE-CRYSTALS
NUCLEAR-RESONANCE
BAND-STRUCTURE
TRANSITION
TEMPERATURE
SCATTERING
Ключевые слова (''Своб.индексиров.''): 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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Korets A., Krylov A. S., Mironov E.
Заглавие : Structural heterogeneity of diamond-containing detonation material
Место публикации : Eur. Phys. J. - Appl. Phys. - 2010. - Vol. 52, Is. 1. - P.10901-10905. - ISSN 1286-0042, DOI 10.1051/epjap/2010126
Примечания : Cited References: 17
Предметные рубрики: NANODIAMONDS
Ключевые слова (''Своб.индексиров.''): influence of density--raman and infrared spectra--structural heterogeneity--variable ratio--detonation--diamonds--diffraction--holographic interferometry--spectroscopy--x ray diffraction--synthetic diamonds
Аннотация: Diamond-containing material (DCM) synthesized by detonation was separated into fractions. Raman and infrared spectra and X-ray diffraction patterns of the individual fractions were measured. The particles of this material were characterized by the variable ratio of the diamond (sp(3)) and non-diamond components. The distribution of sp(3)-grains in the particles was of complicated character. The fine DCM particles contained an insignificant amount of diamond. The influence of density fluctuations on the DCM formation is discussed.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Kolonenko A. L., Osipova I. V., Vnukova N. G., Tomashevich Ye. V., Chiganov A. S., Churilov G. N.
Заглавие : Treatment of detonation diamonds by metalcontained plasma of high frequency arc discharge and their properties
Коллективы : "Advanced Carbon Nanostructures", Joint International Conference
Место публикации : Joint International Conference "Advanced Carbon Nanostructures" (ACN 2011). - 2011. - Ст.P3.26. - С. 187
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Churilov G. N., Osipova I. V., Vnukova N. G., Glushchenko G. A., Petrakovskaya E. A., Kolonenko A. L., Chiganov A. S., Tomashevich Y. V., Zhyzhaev A. M.
Заглавие : Processing of detonation diamonds with metal-containing high-frequency arc plasma and their properties
Место публикации : Fuller. Nanotub. Carbon Nanostruct.: Taylor & Francis, 2012. - Vol. 20, Is. 4/7 SI. - P.611-615. - ISSN 1536-383X, DOI 10.1080/1536383X.2012.657014
Примечания : Cited References: 5. - The work was partially supported by RFBR foundation (project 09-03-00383).
Ключевые слова (''Своб.индексиров.''): nanodiamond--nanoparticle--metal-containing plasma
Аннотация: This paper describes coating of diamond powder with metal by plasma. Arc plasma was generated in double jet high-frequency argon-operated plasmatron with atomized metal inserts. The diamond powder was added to the plasma in a flow of helium. Copper and nickel coated particles of detonation and industrial diamonds were studied by XRD, XPS, SEM methods and electron magnetic resonance. Results of these studies are presented.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Korets A., Krylov A. S., Mironov E., Rabchevskii E.
Заглавие : Experimental study of the structure of milled diamond-containing particles obtained by the detonation method
Место публикации : EPJ Appl. Phys. - 2012. - Vol. 57, Is. 3. - Ст.30701. - ISSN 1286-0042, DOI 10.1051/epjap/2012110208
Примечания : Cited References: 15
Предметные рубрики: PURIFICATION
NANODIAMOND
Ключевые слова (''Своб.индексиров.''): 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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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) : Tomilin F. N., Pomogaev V. A., Melchakova Y. A., Artyushenko P. V., Shubin A. A., Volodin A. M., Zilberberg I. L., Avramov P. V.
Заглавие : Structure and properties of exotic nano- and mesodiamonds with pentagonal symmetry
Место публикации : Russ. Phys. J. - 2022. - Vol. 64, Is. 11. - P.2046-2051. - ISSN 10648887 (ISSN), DOI 10.1007/s11182-022-02553-0
Примечания : Cited References: 16. - These results were obtained within the framework of the State Assignment of the Russian Ministry of Education and Science (No. 0721-2020-0033)
Аннотация: A comprehensive critical survey of structures of exotic nano-, meso- and microdiamonds with dodecahedral and icosahedral symmetry (N/MDPS) is presented. Due to their high dodecahedral or icosahedral symmetry, the unique complex atomic and electronic structure of N/MDPS leads to transport and mechanical properties very promising for photonic, quantum, and nanomechanical applications. To explain the nature of diamonds, theoretical models have been proposed based on the formation of twinned structures consisting of either 5 or 20 symmetrically equivalent tetrahedral and prismatic fragments of the face-centered cubic lattice with the formation of star-shaped or icosahedral clusters, respectively. It has been shown that these twinned nano- and mesodiamonds have limited dimensions due to accumulation of uncompensated structural stresses arising from the deviation of the angles between diamond 111 facets from perfect 72° in tetrahedral fragments of the face-centered cubic lattice to 70.5° between five symmetrically equivalent twinned fragments.
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