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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Князев, Юрий Владимирович, Иванова, Наталья Борисовна, Баюков, Олег Артемьевич, Казак, Наталья Валерьевна, Безматерных, Леонард Николаевич, Васильев, Александр Дмитриевич
Заглавие : Эволюция мессбауэровских спектров людвигита Co3-xFexО2BO3 при замещении кобальта железом
Место публикации : Физ. тверд. тела. - 2013. - Т. 55, Вып. 6. - С. 1088-1092
Примечания : Работа вып. при поддержке грантов РФФИ № 12-02-00175-а12-02-90410-Укр-а12-02-31543-мол-агранта Президента НШ-1044.2012.2программы СО РАН № 38Фед. целевой прогр. ”Науч. и науч.-пед. кадры инновационной России 2009−2013 гг."
Аннотация: Синтезирован концентрационный ряд монокристаллов железо-кобальтовых людвигитов Co3-xFexO2BO3 (x= 0.0125, 0.025, 0.050, 0.10, 1.0). Проведены структурные исследования с помощью рентгеновской дифракции и эффекта Мессбауэра. Обнаружен предпочтительный характер заселения железом неэквивалентных кристаллографических позиций в структуре людвигита. Определена валентность замещающих ионов железа, равная трем. Для Co2FeO2BO3 выявлено усложнение структуры gamma-резонансного спектра, обусловленное композиционным беспорядком в системе.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Knyazev Yu. V., Ivanova N. B., Bayukov O. A., Kazak N. V., Bezmaternykh L. N., Vasiliev A. D.
Заглавие : Evolution of the mossbauer spectra of ludwigite Co3-xFexO2BO3 with substitution of iron for cobalt
Место публикации : Phys. Solid State. - 2013. - Vol. 55, Is. 6. - P.1175-1179. - ISSN 1063-7834, DOI 10.1134/S1063783413060176
Аннотация: A concentration series of single crystals of iron-cobalt ludwigites Co3-xFexO2BO3 (x = 0.0125, 0.025, 0.050, 0.10, 1.0) has been synthesized. The structure has been studied using X-ray diffraction and Mossbauer effect. A preferred occupation of nonequivalent crystallographic positions by iron in the ludwigite structure has been revealed. It has been found that the valence of substituting iron ions is three. It has been revealed that the structure of the ?-resonance spectrum of Co2FeO2BO3 is complicated due to a composition disorder in the system. В© 2013 Pleiades Publishing, Ltd.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Исхаков, Рауф Садыкович, Баюков, Олег Артемьевич, Середкин, Виталий Александрович, Столяр, Сергей Викторович, Яковчук, Виктор Юрьевич, Фролов, Георгий Иванович, Бондаренко, Геннадий Васильевич
Заглавие : Мёссбауэровские исследования в пленках Tb[[d]]x[[/d]]Fe[[d]]1 - x[[/d]]-сплавов с перпендикулярной магнитной анизотропией
Место публикации : Изв. РАН. Сер. физич. - 2013. - Т. 77, № 3. - С. 375-378. - DOI 10.7868/S0367676513030150
Примечания : Работа выполнена при финансовой поддержке Федеральной целевой программы “Научные и научно педагогические кадры инновационной России” на 2009–2013 гг., целевой программы “Развитие научного потенциала высшей школы” 2011 г
Аннотация: Получены аморфные ферримагнитные пленки TbxFe1 - x с перпендикулярной магнитной анизотропией и обменно-связанные структуры TbxFe1 - x/NiFe, характеризующиеся однонаправленной анизотропией. На основе мёссбауэровских исследований этих систем установлена магнитная и химическая неоднородность сплавов TbxFe1 - x компенсационных составов.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Iskhakov R. S., Bayukov O. A., Seredkin V. A., Stolyar S. V., Yakovchuk V.Yu., Frolov G. I., Bondarenko G. V.
Заглавие : Mossbauer studies on Tb x Fe1-x alloy films with perpendicular magnetic anisotropy
Место публикации : Bull. Russ. Acad. Sci.: Phys. - 2013. - Vol. 77, Is. 3. - P.339-342. - ISSN 1062-8738, DOI 10.3103/S1062873813030155
Аннотация: Amorphous ferrimagnetic Tb x Fe1-x films with perpendicular magnetic anisotropy and Tb x Fe1-x /NiFe exchange-coupled structures characterized by unidirectional anisotropy are obtained. The magnetic and chemical inhomogeneity of alloys of Tb x Fe1-x compensation composition is established on the basis of Mossbauer studies of these systems. В© 2013 Allerton Press, Inc.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Myagkov V. G., Bayukov O. A., Zhigalov V. S., Bykova L. E., Drozdova N. A., Bondarenko G. N.
Заглавие : "γ-Fe problem" and epitaxial growth of fe on cu(001)
Коллективы : Moscow International Symposium on Magnetism
Место публикации : Diffusion and Defect Data Pt.B: Solid State Phenomena. - 2012. - Vol. 190. - P.502-505. - ISBN 1012-0394, DOI 10.4028/www.scientific.net/SSP.190.502. - ISBN 9783037854365
Ключевые слова (''Своб.индексиров.''): ?-fe--cu-fe system--magneto-volume effect--solid-state synthesis--thin films--cu-fe system--interlayer formation--magnetic studies--magneto-volume effects--orientation relationship--pseudomorphic growth--residual gas--solid-state synthesis--ultra-thin--buffer layers--magnetic materials--mossbauer spectroscopy--thin films--epitaxial growth
Аннотация: We have observed the formation of a thin buffer layer on the Fe/Cu interface at a temperature of 520 K. Mossbauer spectroscopy and magnetic studies reveal that the residual gases in the chamber (especially oxygen) play an important role in the ultra-thin interlayer formation. It was shown that the Cu2O buffer layer does not change the Pitsh orientation relationships during epitaxial growth of ?-Fe(110) on Cu(001). Our analysis of the experimental results contradicts pseudomorphic growth and formation of ?-Fe on Cu(001). В© (2012) Trans Tech Publications.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Raevski I. P., Titov V. V., Malitskaya M. A., Eremin E. V., Kubrin S. P., Blazhevich A. V., Chen H., Chou C.-C., Raevskaya S. I., Zakharchenko I. N., Sarychev D. A., Shevtsova S. I.
Заглавие : Studies of ferroelectric and magnetic phase transitions in multiferroic PbFe0.5Ta0.5O3-PbTiO3 solid solution ceramics
Коллективы : Russian Foundation for Basic Research (RFBR) [12-08-00887_a]; Research Committee of the University of Macau
Место публикации : J. Mater. Sci.: Springer, 2014. - Vol. 49, Is. 18. - P.6459-6466. - ISSN 0022-2461, DOI 10.1007/s10853-014-8376-z. - ISSN 1573-4803
Примечания : Cited References: 35. - This study is partially supported by the Russian Foundation for Basic Research (RFBR) Project 12-08-00887_a and Research Committee of the University of Macau under Research and Development Grant for Chair Professor.
Предметные рубрики: MOSSBAUER
CRYSTALS
BEHAVIOR
NIOBATE
Аннотация: Dielectric, X-ray, Mossbauer and magnetization studies of (1 − x)PbFe0.5Ta0.5O3–(x)PbTiO3 ceramics with 0 ≤ x ≤ 0.3 have been carried out to determine the compositional evolution of ferroelectric and magnetic phase transition temperatures. Addition of PbTiO3 to PbFe0.5Ta0.5O3 increases the temperature T m of the dielectric permittivity maximum, decreases both the diffusion of this maximum and its frequency dependence. However, the Curie–Weiss temperature exceeds T m for all the compositions studied, indicating that the phase transition still remains diffused. Dilution of the (Fe, Ta)-sublattice by Ti lowers the Neel temperature T N but above a certain compositional threshold (x ≈ 0.1) fast lowering of T N stops and a new magnetic state stable in a rather wide compositional range appears. Large difference between the zero-field-cooled (ZFC) and FC magnetization–temperature curves as well as between the temperatures of magnetic phase transition determined from Mossbauer and magnetization studies for compositions with x 0.1 implies that this state is a spin-glass phase.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Drokina T. V., Petrakovskii G. A., Velikanov D. A., Molokeev M. S., Bayukov O. A., Shadrina A. L., Rezina E. G.
Заглавие : X-ray, mossbauer, magnetic study of Na0.3Li0.7FeGe2O6 pyroxene
Коллективы : Байкальская Международная конференция "Магнитные материалы. Новые технологии", "Магнитные материалы. Новые технологии", Байкальская Международная конференция, "Magnetic materials. New tecnologies", Baikal International Conference, Иркутский государственный университет
Место публикации : Магнитные материалы. Новые технологии: тез. докл. VI Байкал. междунар. конф. BICMM-2014. - Иркутск, 2014. - P.163-164. - ISBN 978-5-9624-1024-1
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev D. A., Krasikov A. A., Dubrovskii A. A., Semenov S. V., Bayukov O. A., Stolyar S. V., Iskhakov R. S., Ladygina V. P., Ishchenko L. A.
Заглавие : Magnetic properties and the mechanism of formation of the uncompensated magnetic moment of antiferromagnetic ferrihydrite nanoparticles of a bacterial origin
Коллективы : Ministry of Education and Science of the Russian Federation; Siberian Branch of the Russian Academy of Sciences
Место публикации : J. Exp. Theor. Phys.: Pleiades Publishing, 2014. - Vol. 119, Is. 3. - P.479-487. - ISSN 1063-7761, DOI 10.1134/S1063776114080044. - ISSN 1090-6509
Примечания : Cited References: 42. - This work was supported by the Ministry of Education and Science of the Russian Federation (state contract in 2014-2016) and a program of the Siberian Branch of the Russian Academy of Sciences.
Предметные рубрики: NIO NANOPARTICLES
EXCHANGE BIAS
HYSTERESIS ANOMALIES
FERRITIN
SURFACE
MOSSBAUER
ORDER
SIZE
Аннотация: The magnetic properties of the superparamagnetic ferrihydrite nanoparticles that form as a result of the vital activity of Klebsiella oxytoca bacteria are studied. Both an initial powder with an average number of iron atoms N Fe ∼ 2000–2500 in a particle and this powder after annealing at 140°C for 3 h in air are investigated. The following substantial modifications of the magnetic properties of the ferrihydrite nanoparticles are detected after annealing: the superparamagnetic blocking temperature increases from 23 to 49.5 K, and the average magnetic moment of a particle increases (as follows from the results of processing of magnetization curves). The particles have antiferromagnetic ordering, and the magnetic moment resulting in the superparamagnetism of the system appears due to random spin decompensation inside the particle. For this mechanism, the number of uncompensated spins is proportional to the number of magnetically active atoms raised to the one-half power, and this relation holds true for the samples under study at a good accuracy. The possible causes of the detected shift of magnetic hysteresis loops at low temperatures upon field cooling are discussed.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Badía-Romano L., Rubin J., Bartolomé F., Magen C., Bartolome J., Varnakov S. N., Ovchinnikov S. G., Rubio-Zuazo J., Castro G.R.
Заглавие : Morphology of the asymmetric iron-silicon interfaces
Место публикации : J. Alloys Compd.: Elsevier Science, 2015. - Vol. 627. - P.136-145. - ISSN 0925, DOI 10.1016/j.jallcom.2014.12.019. - ISSN 18734669(eISSN)
Примечания : Cited References:69. - The financial support of the Spanish MINECO MAT2011-23791, the Presidentof Russia Grant (NSh-1044.2012.2), RFFI Grant 13-02-01265, the Ministryof Education and Science of Russian Federation (14.604.21.0002 and02G25.31.0043), Aragonese DGA-IMANA E34 (cofunded by Fondo SocialEuropeo) and that received from the European Union FEDER funds isacknowledged. L.B.R. acknowledges the Spanish MINECO FPU 2010 grant.
Предметные рубрики: RAY PHOTOELECTRON-SPECTROSCOPY
ELECTRON MOSSBAUER-SPECTROSCOPY
Ключевые слова (''Своб.индексиров.''): fe/si nanolayers--interfaces--fe silicides--compositional depth--haxpes--cems
Аннотация: A systematic study of the iron–silicon interfaces formed upon preparation of (Fe/Si) multilayers has been performed by combination of modern and powerful techniques. Samples were prepared by thermal evaporation under ultrahigh vacuum onto a Si(1 0 0) substrate. The morphology of these films and their interfaces was studied by a combination of scanning transmission electron microscopy, X-ray reflectivity, angle resolved X-ray photoelectron spectroscopy and hard X-ray photoelectron spectroscopy. The Si-on-Fe interface thickness and roughness were determined to be 1.4(1) nm and 0.6(1) nm, respectively. Moreover, determination of the stable phases formed at both Fe-on-Si and Si-on-Fe interfaces was performed using conversion electron Mössbauer spectroscopy on multilayers with well separated Si-on-Fe and Fe-on-Si interfaces. It is shown that while a fraction of Fe remains as α-Fe, the rest has reacted with Si, forming the paramagnetic c-Fe1−xSi phase and a ferromagnetic Fe rich silicide (DO3 type phase). We conclude that the paramagnetic c-Fe1−xSi silicide sublayer is identical in both Si-on-Fe and Fe-on-Si interfaces, whereas an asymmetry is revealed in the composition of the ferromagnetic silicide sublayer.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Lyubutin I. S., Korotkov, N. Yu., Frolov K. V., Kazak N. V., Platunov M. S., Knyazev, Yu. V., Bezmaternykh L. N., Ovchinnikov S. G., Arauzo A., Bartolome J.
Заглавие : Spin-glass behavior of warwickite MgFeBO4 and CoFeBO4 crystals observed by Mössbauer spectroscopy
Место публикации : J. Alloys Compd.: Elsevier Science, 2015. - Vol. 642. - P.204-209. - ISSN 0925, DOI 10.1016/j.jallcom.2015.04.067. - ISSN 18734669(eISSN)
Примечания : Cited References:29. - This study was supported by the Russian Foundation for Basic Research (Grants # 14-02-00483a, 14-02-31051-mol-a, 13-02-00958- a, and 13-02-00358-a), by the Council for Grants of the President of the Russian Federation (Project Nos. NSh-2886.2014.2 and SP-938.2015.5), by the Grant of KSAI, Krasnoyarsk regional fund of supporting scientific and technological activities and by the program of Foundation for Promotion of Small Enterprises in Science and Technology (''UMNIK'' program). The Spanish MINECO project MAT2011/23791, MAT2014/53921 and DGA E-34 are acknowledged.
Предметные рубрики: SOLVABLE MODEL
SPECTRA
Ключевые слова (''Своб.индексиров.''): warwickites--spin-glass--mossbauer spectroscopy
Аннотация: Single crystals of MgFeBO4 and СоFeBO4 warwickites were obtained. The effects of charge ordering and magnetic properties were investigated by Mössbauer spectroscopy. Cation distribution over M1 and M2 nonequivalent sites and the average charge at the metal positions were established. Low temperature Mössbauer spectra reveal spin-glass behavior, with spin-freezing temperatures TSG of 15.2 and 33.2 K for Mg- and Co-warwickites, respectively, higher than that observed from the d.c. and a.c. magnetic susceptibility measurements. The difference is explained in terms of dynamical scaling theory. The specific shape of the Mössbauer spectra in the vicinity of the magnetic transition at TSG shows the difference between spin-glass and superparamagnetic behavior and demonstrates an overwhelming role of the exchange anisotropy in the properties of Mg-warwickite. In Co-warwickite the increase of magnetocrystalline anisotropy provokes an increase in magnetic viscosity.Были получены монокристаллы MgFeBO4 и CoFeBO4 warwickites. Эффекты упорядочения зарядов и магнитные свойства были исследованы методом мессбауэровской спектроскопии. Было определено распределение катионов на М1 и M2 неэквивалентных позициях и средний заряд на металлических позициях. При низкой температуре Мессбауэровские спектры показывают поведение типа спинового стекла, с температурой замораживания спинов TSG 15.2 и 33.2 K для MG-и Co-warwickites, соответственно, более высокие, чем наблюдалось от постоянного тока и на ~ измерениях магнитной восприимчивости. Разница объясняется в терминах динамической теории подобия. Удельный форма спектров Мессбауэра в непосредственной близости от магнитного перехода на TSG показывает разницу между спин-стекольным и суперпарамагнитным поведением и демонстрирует подавляющее роль обменной анизотропии в свойствах Mg-warwickite. В Co-warwickite увеличение магнитокристаллической анизотропия провоцирует увеличение магнитной вязкости.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev D. A., Krasikov A. A., Dubrovskii A. A., Bayukov O. A., Stolyar S. V., Iskhakov R. S., Ladygina V. P., Yaroslavtsev R. N.
Заглавие : The effect of low-temperature heat treatment on the magnetic properties of biogenic ferrihydrite nanoparticles
Коллективы : Ministry of Education and Science of the Russian Federation
Место публикации : Tech. Phys. Lett.: MAIK Nauka-Interperiodica / Springer, 2015. - Vol. 41, Is. 7. - P.705-709. - ISSN 1063-7850, DOI 10.1134/S1063785015070172
Примечания : Cited References: 12. - This study was supported in part by the Ministry of Education and Science of the Russian Federation in the framework of a federal program for 2014-2016.
Предметные рубрики: BACTERIAL FERRIHYDRITE
MOSSBAUER
Аннотация: We have studied the influence of low-temperature heat treatment (annealing) on the magnetic properties of superparamagnetic nanoparticles of biogenic ferrihydrite. It is established that the proposed treatment leads to an increase in the blocking temperature and magnetic susceptibility of samples. After subsequent exposure in aqueous medium, the magnetic properties of annealed sol remain constant. The character of changes in the magnetic properties of samples studied shows that low-temperature heat treatment allows nanoparticle dimensions to be increased in a controlled way. © 2015, Pleiades Publishing, Ltd.
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Anshits A. G., Bayukov O. A., Anshits N. N., Pletnev O. N., Rabchevskii E. V., Vereshchagin S. N., Kondratenko E. V.
Заглавие : Nature of the active sites of ferrospheres in the oxidative condensation of methane
Коллективы : Russian Science Foundation [4-13-00289], Russian Congress on Catalysis (2; 2014 ; Oct. ; 2–5; Samara)
Место публикации : Kinet. Catal.: MAIK Nauka-Interperiodica / Springer, 2015. - Vol. 56, Is. 4. - P.523-531. - ISSN 0023, DOI 10.1134/S0023158415040023. - ISSN 16083210(eISSN)
Примечания : Cited References:37. - This work was supported by the Russian Science Foundation (grant no. 14-13-00289).
Предметные рубрики: GLASS CRYSTAL CATALYSTS
HIGH-TEMPERATURE
MOSSBAUER
MAGNETITES
MICROSPHERES
SELECTIVITY
CONVERSION
FERRITES
ASHES
IRON
Ключевые слова (''Своб.индексиров.''): oxidative condensation of methane--ferrospheres--iron spinel--mossbauer spectroscopy--structural defects
Аннотация: The catalytic properties of ferrospheres containing 76–97 wt % Fe2O3 in the oxidative condensation of methane were compared with their phase composition and the distribution of iron cations over the crystallographic positions of iron-containing phases in a steady state. It was established that the reaction route of methane oxidation changed at a Fe2O3 content of 89 wt %. Deep oxidation was the main reaction route on ferrospheres with a Fe2O3 content of 88.8 wt %. At a Fe2O3 content of ≥89 wt %, the yield of C2 hydrocarbons sharply increased and the contribution of deep oxidation decreased. The yield of C2 hydrocarbons correlated with the amount of defects in the structure of iron spinel, which are iron ions with the tetrahedral cation of Ca2+ and the octahedral cation vacancy among the nearest neighbors.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Li, Oksana A., Lin, Chun-Rong, Chen, Hung-Yi, Hsu, Hua-Shu, Wu, Kai-Wun, Tseng, Yaw-Teng, Bayukov O. A., Edelman I. S., Ovchinnikov S. G., Shih, Kun-Yauh
Заглавие : Structural and magnetic properties of Fe1−xCoxSe1.09 nanoparticles obtained by thermal decomposition
Место публикации : Mater. Res. Express: IOP Publishing, 2015. - Vol. 2, No. 12. - Ст.126501. - ISSN 2053-1591, DOI 10.1088/2053-1591/2/12/126501
Примечания : Cited References: 30. - This work is supported by the Ministry of Science and Technology of Taiwan (MOST103-2811-M-153 -001 and MOST102-2112-M-153 -002 -MY3).
Предметные рубрики: X-RAY-DIFFRACTION
MOSSBAUER-SPECTROSCOPY
CRYSTAL-STRUCTURES
IRON SELENIDES
SUPERCONDUCTIVITY
FeSe
MARCASITE
PYRITE
Ключевые слова (''Своб.индексиров.''): nanoparticles--chalcogenide--iron-cobalt selenide--ferrimagnetism--paramagnetism--mossbauer spectroscopy
Аннотация: A series of Fe1−xCoxSe1.09 (x = 0 to ) nanoparticles were synthesized by thermal decomposition method. Particles in composition range Fe0.5Co0.5Se1.09 to CoSe1.09 crystallized in monoclinic structure of Co6.8Se8 , while FeSe1.09 crystallized in hexagonal structure of FeSe achavalite. Magnetization dependences on temperature and external magnetic field reveal complicated magnetic behavior and correspond to the sum of paramagnetic and superparamagnetic response. Mössbauer spectra contain several paramagnetic doublets with parameters corresponding to nonequivalent positions of divalent and trivalent iron cations with low spin. The nonequivalent positions appeared due to inhomogeneous distribution of Co ions or metal vacancies in iron surrounding.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bataleva, Yu. V., Palyanov, Yu. N., Borzdov, Yu. M., Bayukov O. A., Sobolev N. V.
Заглавие : Conditions for diamond and graphite formation from iron carbide at the P-T parameters of lithospheric mantle
Коллективы : Russian Science Foundation [14-27-00054]
Место публикации : Russ. Geol. Geophys.: Elsevier Science, 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. - ISSN 1068-7971, DOI 10.1016/j.rgg.2016.01.012. - ISSN 1878-030X(eISSN)
Примечания : Cited References:55. - This work was supported by the Russian Science Foundation under Grant No. 14-27-00054.
Предметные рубрики: DEEP CARBON-CYCLE
EARTHS MANTLE
MINERAL INCLUSIONS
HIGH-PRESSURE
KOKCHETAV MASSI
SUBDUCTION ZONES
REDOX BUDGET
FERRIC IRON
MOSSBAUER
METAL
Ключевые слова (''Своб.индексиров.''): 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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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gorev M. V., Flerov I. N., Tressaud A., Bogdanov E. V., Kartashev A. V., Bayukov O. A., Eremin E. V., Krylov A. S.
Заглавие : Heat capacity and magnetic properties of fluoride CsFe2+Fe3+F6 with defect pyrochlore structure
Место публикации : J. Solid State Chem. - 2016. - Vol. 237. - P.330-335. - ISSN 00224596 (ISSN), DOI 10.1016/j.jssc.2016.02.045
Примечания : Cited References: 19. - This study was partially supported by the Grant NSh-924.2014.2 of the President of the Russian Federation for the Support of Leading Scientific Schools.
Предметные рубрики: Crystal-structure
Mossbauer
CsFe2F6
Spectra
Ключевые слова (''Своб.индексиров.''): pyrochlore structure--phase transition--magnetic properties--thermal properties
Аннотация: Heat capacity, Mossbauer and Raman spectra as well as magnetic properties of fluoride CsFe2F6 with defect pyrochlore structure were studied. In addition to recently found above room temperature three successive structural transformations Pnma-Imma-I41amd-Fd-3m, phase transition of antiferromagnetic nature with the 13.7 K Neel temperature and a broad heat capacity anomaly with a maximum at about 30 K were observed. The room temperature symmetry Pnma is unchanged at least down to 7 K. Simple model of indirect bond used to estimate the exchange interactions and to propose a magnetic structure model. © 2016 Elsevier Inc. All rights reserved.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev D. A., Krasikov A. A., Dubrovskiy A. A., Popkov S. I., Stolyar S. V., Bayukov O. A., Iskhakov R. S., Ladygina V. P., Yaroslavtsev R. N.
Заглавие : Magnetic properties of heat treated bacterial ferrihydrite nanoparticles
Место публикации : J. Magn. Magn. Mater.: Elsevier, 2016. - Vol. 410. - P.171-180. - ISSN 03048853 (ISSN), DOI 10.1016/j.jmmm.2016.02.059
Примечания : Cited References: 66. - TEM studies were performed on facility of Resource Sharing Center of Krasnoyarsk Scientific Center of Siberian Branch of Russian Academy of Sciences. Authors acknowledge to M.N. Volochaev for the TEM measurements.
Предметные рубрики: Hematite nanoparticles
NiO nanoparticles
Porous-glass
Ferritin
Particles
Temperature
Hysteresis
Transition
Anomalies
Mossbauer
Ключевые слова (''Своб.индексиров.''): ferrihydrite--nanoparticles--superparamagnetism
Аннотация: The magnetic properties of ferrihydrite nanoparticles, which are products of vital functions of Klebsiella oxitoca bacteria, have been studied. The initial powder containing the nanoparticles in an organic shell was subjected to low-temperature (T=160 °C) heat treatment for up to 240 h. The bacterial ferrihydrite particles exhibit a superparamagnetic behavior. Their characteristic blocking temperature increases from 26 to 80 K with the heat treatment. Analysis of the magnetization curves with regard to the magnetic moment distribution function and antiferromagnetic contribution shows that the low-temperature heat treatment enhances the average magnetic moment of a particle; i.e., the nanoparticles coarsen, probably due to their partial agglomeration during heat treatment. It was established that the blocking temperature nonlinearly depends on the particle volume. Therefore, a model was proposed that takes into account both the bulk and surface magnetic anisotropy. Using this model, the bulk and surface magnetic anisotropy constants KV≈1.7×105 erg/cm3 and KS≈0.055 erg/cm2 have been determined. The effect of the surface magnetic anisotropy of ferrihydrite nanoparticles on the observed magnetic hysteresis loops is discussed.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Frolov K. V., Lyubutin I. S., Smirnova E. S., Alekseeva O. A., Verin I. A., Artemov V. V., Kharlamova S. A., Bezmaternykh L. N., Gudim, I. A.
Заглавие : Low-temperature structural and magnetic phase transitions in multiferroic GdFe3(BO3)4
Коллективы : Russian Foundation for Basic Research [14-02-00483a, 13-02-12442]; Council on Grants from the President of the Russian Federation for Support of Leading Scientific Schools [NSh-1130.2014.5, NSh-924.2014.2]; Russian Ministry of Education and Science [RFMEFI62114X0005]
Место публикации : J. Alloys Compd.: Elsevier Science, 2016. - Vol. 671. - P.545-551. - ISSN 0925-8388, DOI 10.1016/j.jallcom.2016.02.083. - ISSN 1873-4669(eISSN)
Примечания : Cited References:36. - We thank Dr. A.P. Dudka for help in the low temperature XRD measurements. This study was supported in part by the Russian Foundation for Basic Research (projects # 14-02-00483a and 13-02-12442), and the Council on Grants from the President of the Russian Federation for Support of Leading Scientific Schools (grant # NSh-1130.2014.5 and # NSh-924.2014.2). This work was performed using the equipment of the Shared Research Center IC RAS and was supported by the Russian Ministry of Education and Science (project RFMEFI62114X0005).
Предметные рубрики: IRON BORATE GDFE3(BO3)4
BIFEO3 THIN-FILMS
MAGNETOELASTIC PROPERTIES
RM3(BO3)4 CRYSTALS
TRIGONAL GDFE3(BO3)4
ENHANCED POLARIZATION
HIGH-PRESSURES
CRYSTALLIZATION
BEHAVIOR
GROWTH
Ключевые слова (''Своб.индексиров.''): multiferroics--rare earth compounds--x-ray diffraction--mossbauer--spectroscopy--crystal structure--spin dynamics
Аннотация: X-ray analysis revealed that at temperature decreasing from room temperature to Tstr = 155 K the crystal unit cell GdFe3(BO3)4 is reduced only along the c axis (at 0.01 Å), while the a and b axes are unchanged within the error limits. The volume of the crystal decreases uniformly in the direction of all three axes at 155–80 K. At 80–30 K the crystal volume is decreased only by reduction of the parameters a and b, while the parameter c increases conversely. In the paramagnetic region Mössbauer spectra do not distinguish between the two structural positions of iron ions Fe1 and Fe2, appearing at T < Tstr. Below the temperature of the magnetic phase transition at TN = 38.0(1) K the Mössbauer data indicate quasi-one-dimensional magnetic ordering of iron moments in the sublattice Fe2 and a two-dimensional one in the iron sublattice Fe1. The dynamics of spin reorientation in sublattices Fe1 and Fe2 is studied in detail.Рентгеновский анализ показал, что при уменьшении температуры от комнатной до Tstr = 155 K изменение параметра элементарной ячейки кристалла GdFe3(BO3)4 происходит лишь вдоль оси с (при 0,01 Å), в то время как а и b оси остаются неизменными в пределах погрешности измерений. Объем кристалла уменьшается равномерно в направлении всех трех осей при 155-80 K. При 80-30 K объем кристалла уменьшается только уменьшением параметров a и b, в то время как параметр с наоборот увеличивается. В парамагнитной области Мессбауэровские спектры не различают двух структурных позиций ионов железа Fe1 и Fe2, появляющиеся при Т˂Tstr. Ниже температуры магнитного фазового перехода при TN = 38,0(1) К Мёссбауэрские данные указывают на квази-одномерный магнитное упорядочение моментов железа в подрешетке Fe2 и двумерное в железной подрешетке Fe1. Динамика спиновой переориентации в подрешетках Fe1 и Fe2 подробно изучается.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bartolome J., Arauzo A., Kazak N. V., Ivanova N. B., Ovchinnikov S. G., Knyazev Yu. V., Lyubutin I. S.
Заглавие : Uniaxial magnetic anisotropy in Co2.25Fe0.75O2BO3 compared to Co3O2BO3 and Fe3O2BO ludwigites
Разночтения заглавия :авие SCOPUS: Uniaxial magnetic anisotropy in Co2.25Fe0.75O 2BO3 compared to Co3O2BO3 and Fe3O2BO ludwigites
Место публикации : Phys. Rev. B: AMER PHYSICAL SOC, 2011. - Vol. 83, Is. 14. - Ст.144426. - ISSN 1098-0121, DOI 10.1103/PhysRevB.83.144426
Примечания : Cited References: 25. - The authors acknowledge V. V. Rudenko for the oxyborate samples they made and O. A. Bayukov for fruitful discussion. The financial support of Spanish MINCYT, Grant No. MAT08/1077, and the Aragonese E-34 project are acknowledged. Fruitful discussions with F. Bartolome and P. Bordet are acknowledged. The latter is thanked for providing the FeINF3/INFOINF2/INFBOINF3/INF single crystal. Also this study was supported by the Russian Foundation for Basic Research (Project No. 09-02-00171-a), the Federal Agency for Science and Innovation (Rosnauka) (Project No. MK-5632.2010.2), and the Physical Division of the Russian Academy of Science (Program "Strongly Correlated Electrons," Project No. 2.3.1).
Предметные рубрики: CRYSTAL-STRUCTURE
MOSSBAUER
CO3BO5
Аннотация: Magnetic and Mossbauer spectroscopy (MS) measurements have been performed on a single crystal of Co2.25Fe0.75O2BO3 with ludwigite structure. Two magnetic transitions (T-N = 115 K and T-C = 70 K) were traced from the ac susceptibility temperature dependence. The MS spectra as a function of temperature clearly show the onset of magnetic ordering below 115 K. Magnetization measurements on the parent Co3O2BO3 and Fe3O2BO3 compounds have been done for comparison. In Fe3O2BO3 the anisotropy of the different phases has been determined, showing that the anisotropy axis changes from the a to the b axis in the low-temperature antiferromagnetic phase. High magnetic uniaxial anisotropy has been detected for both Co3O2BO3 and Co2.25Fe0.75O2BO3. From the angle-dependent magnetization measurements it is found that in both compounds the easy axis of magnetization is the b [010] axis, where an antiferromagnetic component is superimposed on the main ferromagnetic component. In the c direction the behavior is purely antiferromagnetic. In Co2.25Fe0.75O2BO3 a strong reduction of the remanent magnetization and a very strong increase in coercive field along the b axis with respect to those found in Co3O2BO3 were observed from magnetic hysteresis cycles measured below T-C. The increase of coercive field is caused by the increase of defects upon Co substitution by Fe.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Rebbouh L., Desautels R. D., Ritter C., Cadogan J. M., Temerov V., Pankrats A. I., van Lierop J.
Заглавие : Short-range correlations and their thermal hysteresis in the paramagnetic phase of YFe3(BO3)(4)
Разночтения заглавия :авие SCOPUS: Short-range correlations and their thermal hysteresis in the paramagnetic phase of YFe3(BO3)4
Место публикации : Phys. Rev. B: AMER PHYSICAL SOC, 2011. - Vol. 83, Is. 14. - Ст.140406. - ISSN 1098-0121, DOI 10.1103/PhysRevB.83.140406
Примечания : Cited References: 21. - This work was supported by grants from the Natural Sciences and Engineering Research Council of Canada and the Canada Foundation for Innovation. J.M.C. acknowledges support from the Canada Research Chairs program.
Предметные рубрики: MOSSBAUER-SPECTRA
GDFE3(BO3)(4)
RELAXATION
Аннотация: Neutron diffraction and Mossbauer spectroscopy have been used to examine the connections between long-and short-range magnetic order in the rare-earth iron ferroborate YFe3(BO3)(4). We establish the presence of short-range magnetic order in the pseudo-one-dimensional Fe-spin chains of the FeO6 octahedra while the ferroborates are in their (long-range) paramagnetic phase. The short-range order exists at temperatures several times the Neel temperature. In addition, we observe thermal hysteresis of the short-range ordered Fe spins. The observed Fe-spin dynamics are suggestive of the presence of solitons within the domains that form in the Fe-spin chains.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Stolyar S. V., Bayukov O. A., Ladygina V. P., Iskhakov R. S., Ishchenko L. A., Yakovchuk V. Y., Dobretsov K. G., Pozdnyakov A. I., Piksina O. E.
Заглавие : Mossbauer Investigation of Temperature Transformations in Bacterial Ferrihydrite
Разночтения заглавия :авие SCOPUS: Mossbauer investigation of temperature transformations in bacterial ferrihydrite
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2011. - Vol. 53, Is. 1. - P100-104. - ISSN 1063-7834, DOI 10.1134/S1063783411010306
Примечания : Cited References: 10. - This study was supported by the Federal Agency for Science and Innovation of the Russian Federation within the framework of the Russian Federal Target Program "Scientific and Scientific-Pedagogical Personnel of the Innovative Russia" for 2009-2013 and the Russian Foundation for Basic Research (project no. 09-04-98038-r_sibir'_a).
Аннотация: Ferrihydrite nanoparticles formed as a result of the microorganism activity have been studied using Mossbauer spectroscopy, X-ray powder diffraction analysis, and X-ray fluorescence analysis. Three positions of trivalent iron with nonoverlapping ranges of quadrupole splittings have been revealed in bacterial ferrihydrite: QS{Fe(3+)(1)} = 0.49-0.83 mm/s, QS{Fe(3+)(2)} = 0.84-1.10 mm/s, and QS{Fe(3+)(3)} = 1.25-1.73 mm/s. It has been experimentally demonstrated that the Fe(3+)(3) positions are the centers of nucleation of the hematite phase in the course of heat treatment.
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