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Studies of ferroelectric and magnetic phase transitions in multiferroic PbFe0.5Ta0.5O3-PbTiO3 solid solution ceramics / I. P. Raevski [et al.] // J. Mater. Sci. - 2014. - Vol. 49, Is. 18. - P. 6459-6466, DOI 10.1007/s10853-014-8376-z. - 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. . - ISSN 0022-2461. - ISSN 1573-4803

РУБ Materials Science, Multidisciplinary
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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Держатели документа:
Southern Fed Univ, Fac Phys, Rostov Na Donu 344090, Russia
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia
Univ Macau, Fac Sci & Technol, Taipa, Peoples R China
Natl Taiwan Univ Sci & Technol, Taipei 106, Taiwan

Доп.точки доступа:
Raevski, I. P.; Titov, V. V.; Malitskaya, M. A.; Eremin, E. V.; Еремин, Евгений Владимирович; Kubrin, S. P.; Blazhevich, A. V.; Chen, H.; Chou, C.-C.; Raevskaya, S. I.; Zakharchenko, I. N.; Sarychev, D. A.; Shevtsova, S. I.; Russian Foundation for Basic Research (RFBR) [12-08-00887_a]; Research Committee of the University of Macau
}
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Magnetic properties and the mechanism of formation of the uncompensated magnetic moment of antiferromagnetic ferrihydrite nanoparticles of a bacterial origin / D. A. Balaev [et al.] // J. Exp. Theor. Phys. - 2014. - Vol. 119, Is. 3. - P. 479-487, DOI 10.1134/S1063776114080044. - 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. . - ISSN 1063-7761. - ISSN 1090-6509

РУБ Physics, Multidisciplinary
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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Публикация на русском языке Магнитные свойства и механизм формирования нескомпенсированного магнитного момента антиферромагнитных наночастиц ферригидрита бактериального происхождения [Текст] / Д. А. Балаев [и др.] // Журн. эксперим. и теор. физ. : Наука, 2014. - Т. 146 Вып. 3. - С. 546–556

Держатели документа:
Russian Acad Sci, Siberian Branch, Kirenskii Inst Phys, Krasnoyarsk 660041, Russia
Siberian Fed Univ, Krasnoyarsk 660041, Russia
Russian Acad Sci, Int Sci Ctr Extreme States Organisms, Siberian Branch, Krasnoyarsk Sci Ctr, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Krasikov, A. A.; Красиков, Александр Александрович; Dubrovskii, A. A.; Дубровский, Андрей Александрович; Semenov, S. V.; Семёнов, Сергей Васильевич; Bayukov, O. A.; Баюков, Олег Артемьевич; Stolyar, S. V.; Столяр, Сергей Викторович; Iskhakov, R. S.; Исхаков, Рауф Садыкович; Ladygina, V. P.; Ладыгина, Валентина Петровна; Ishchenko, L. A.; Ищенко, Л. А.; Ministry of Education and Science of the Russian Federation; Siberian Branch of the Russian Academy of Sciences
}
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The effect of low-temperature heat treatment on the magnetic properties of biogenic ferrihydrite nanoparticles / D. A. Balaev [et al.] // Tech. Phys. Lett. - 2015. - Vol. 41, Is. 7. - P. 705-709, DOI 10.1134/S1063785015070172. - 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. . - ISSN 1063-7850

РУБ Physics, Applied
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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Публикация на русском языке Влияние низкотемпературной термообработки на магнитные свойства наночастиц ферригидрита биогенного происхождения [Текст] / Д. А. Балаев [и др.] // Письма в Журн. техн. физ. : Санкт-Петербургская издательская фирма "Наука" РАН, 2015. - Т. 41 Вып. 14. - С. 88-96

Держатели документа:
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation
Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Krasikov, A. A.; Dubrovskii, A. A.; Дубровский, Андрей Александрович; Bayukov, O. A.; Баюков, Олег Артемьевич; Stolyar, S. V.; Столяр, Сергей Викторович; Iskhakov, R. S.; Исхаков, Рауф Садыкович; Ladygina, V. P.; Ладыгина, Валентина Петровна; Yaroslavtsev, R. N.; Ярославцев, Роман Николаевич; Ministry of Education and Science of the Russian Federation
}
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Nature of the active sites of ferrospheres in the oxidative condensation of methane / A. G. Anshits [et al.] // Kinet. Catal. - 2015. - Vol. 56, Is. 4. - P. 523-531, DOI 10.1134/S0023158415040023. - Cited References:37. - This work was supported by the Russian Science Foundation (grant no. 14-13-00289). . - ISSN 0023. - ISSN 1608-3210. -

РУБ Chemistry, Physical
Рубрики:
GLASS CRYSTAL CATALYSTS
   HIGH-TEMPERATURE
   MOSSBAUER
   MAGNETITES
   MICROSPHERES
   SELECTIVITY
   CONVERSION
   FERRITES
   ASHES
   IRON
Кл.слова (ненормированные):
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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Публикация на русском языке Природа активных центров ферросфер в процессе окислительной конденсации метана [Текст] / А. Г. Аншиц [и др.] // Кинетика и катализ : Наука, 2015. - Т. 56 № 4. - С. 529-538

Доп.точки доступа:
Anshits, A. G.; Аншиц, Александр Георгиевич; Bayukov, O. A.; Баюков, Олег Артемьевич; Anshits, N. N.; Pletnev, O. N.; Плетнев, Олег Николаевич; Rabchevskii, E. V.; Vereshchagin, S. N.; Kondratenko, E. V.; Russian Science Foundation [4-13-00289]; Russian Congress on Catalysis (2 ; 2014 ; Oct. ; 2–5 ; Samara)
}
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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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Heat capacity and magnetic properties of fluoride CsFe2+Fe3+F6 with defect pyrochlore structure / M. V. Gorev [et al.] // J. Solid State Chem. - 2016. - Vol. 237. - P. 330-335, DOI 10.1016/j.jssc.2016.02.045. - 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. . - ISSN 0022-4596

РУБ Chemistry, Inorganic & Nuclear + Chemistry, Physical
Рубрики:
Crystal-structure
   Mossbauer
   CsFe2F6
   Spectra
Кл.слова (ненормированные):
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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Держатели документа:
Kirensky Institute of Physics, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk, Russian Federation
Institute of Engineering Physics and Radio Electronics, Siberian State University, Krasnoyarsk, Russian Federation
Institut de Chimie de la Matiere Condensee, ICMCB, CNRS, Universite Bordeaux, Pessac Cedex, France
Astafijev Krasnoyarsk State Pedagogical University, Krasnoyarsk, Russian Federation
Krasnoyarsk State Agrarian University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Gorev, M. V.; Горев, Михаил Васильевич; Flerov, I. N.; Флёров, Игорь Николаевич; Tressaud, A.; Bogdanov, E. V.; Богданов, Евгений Витальевич; Kartashev, A. V.; Карташев, Андрей Васильевич; Bayukov, O. A.; Баюков, Олег Артемьевич; Eremin, E. V.; Еремин, Евгений Владимирович; Krylov, A. S.; Крылов, Александр Сергеевич
}
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Magnetic properties of heat treated bacterial ferrihydrite nanoparticles / D. A. Balaev [et al.] // J. Magn. Magn. Mater. - 2016. - Vol. 410. - P. 171-180, DOI 10.1016/j.jmmm.2016.02.059. - 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. . - ISSN 0304-8853

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
Hematite nanoparticles
   NiO nanoparticles
   Porous-glass
   Ferritin
   Particles
   Temperature
   Hysteresis
   Transition
   Anomalies
   Mossbauer
Кл.слова (ненормированные):
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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Держатели документа:
Kirensky Institute of Physics, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation
Presidium of Krasnoyarsk Scientific Center, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk, Russian Federation
International Laboratory of High Magnetic Fields and Low Temperatures, Gajowicka 95, Wroclaw, Poland

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Krasikov, A. A.; Красиков, Александр Александрович; Dubrovskiy, A. A.; Дубровский, Андрей Александрович; Popkov, S. I.; Попков, Сергей Иванович; Stolyar, S. V.; Столяр, Сергей Викторович; Bayukov, O. A.; Баюков, Олег Артемьевич; Iskhakov, R. S.; Исхаков, Рауф Садыкович; Ladygina, V. P.; Yaroslavtsev, R. N.
}
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Uniaxial magnetic anisotropy in Co2.25Fe0.75O2BO3 compared to Co3O2BO3 and Fe3O2BO ludwigites / J. . Bartolome [et al.] // Phys. Rev. B. - 2011. - Vol. 83, Is. 14. - Ст. 144426, DOI 10.1103/PhysRevB.83.144426. - 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). . - ISSN 1098-0121

РУБ Physics, Condensed Matter
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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Держатели документа:
[Bartolome, J.] Univ Zaragoza, CSIC, Inst Ciencia Mat Aragon, E-50009 Zaragoza, Spain
[Bartolome, J.] Univ Zaragoza, CSIC, Dept Fis Mat Condensada, E-50009 Zaragoza, Spain
[Arauzo, A.] Univ Zaragoza, Serv Instrumentac Cientif, Area Medidas Fis, E-50009 Zaragoza, Spain
[Kazak, N. V.
Ovchinnikov, S. G.] RAS, SB, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Ivanova, N. B.
Knyazev, Yu. V.] Siberian Fed Univ, Krasnoyarsk 660074, Russia
[Ivanova, N. B.] Krasnoyarsk State Agrarian Univ, Krasnoyarsk, Russia
[Ovchinnikov, S. G.] Siberian State Aerosp Univ, Krasnoyarsk, Russia
[Lyubutin, I. S.] RAS, AV Shubnikov Crystallog Inst, Moscow 119333, Russia
ИФ СО РАН
Instituto de Ciencia de Materiales de Aragon, Departamento de Fisica de la Materia Condensada, CSIC-Universidad de Zaragoza, 50009 Zaragoza, Spain
Servicio de Instrumentacion Cientifica, Area de Medidas Fisicas, Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
L.V. Kirensky Institute of Physics, SB of RAS, 660036, Akademgorodok, Krasnoyarsk, Russian Federation
Siberian Federal University, Kirensky street 26, 660074, Krasnoyarsk, Russian Federation
Krasnoyarsk State Agrarian University, Mira street 90, Krasnoyarsk, Russian Federation
Siberian State Aerospace University, Krasnoyarskiy Rabochiy street 31, Krasnoyarsk, Russian Federation
Shubnikov Institute of Crystallography, RAS, Leninskiy prospect 59, 119333, Moscow, Russian Federation

Доп.точки доступа:
Bartolome, J.; Arauzo, A.; Kazak, N. V.; Казак, Наталья Валерьевна; Ivanova, N. B.; Иванова, Наталья Борисовна; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Knyazev, Yu. V.; Князев, Юрий Владимирович; Lyubutin, I. S.
}
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State of iron in nanoparticles prepared by impregnation of silica gel and aluminum oxide with FeSO4 solutions / G. A. Bukhtiyarova [et al.] // Phys. Solid State. - 2010. - Vol. 52, Is. 4. - P. 826-837, DOI 10.1134/S1063783410040268. - Cited References: 27. - This study was supported by the Presidium of the Russian Academy of Sciences within the framework of the Program no. 27 "Principles of Basic Research of Nanotechnologies and Nanomaterials," Project no. 46 "Magnetically Ordered Nanoparticles in Catalytic Systems: Synthesis, Evolution, and Physicochemical Properties." . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
THERMAL-DECOMPOSITION
   BETA-FEOOH
   MOSSBAUER
   FERRIHYDRITE
   EPSILON-FE2O3
   FE-2(SO4)(3)
   SULFATE
   FE-57
Аннотация: The state of iron in nanoparticles prepared by impregnating silica gel and aluminum oxide with iron(II) sulfate solutions has been investigated using Mossbauer spectroscopy. It has been revealed that the state of iron depends on the nature of the support. Iron(III) hydroxysulfate and iron(III) oxysulfate nanoparticles are formed on the surface of silica gel, and iron oxide nanoparticles are formed on the surface of aluminum oxide. An increase in the concentration of iron ions or in the size of iron-containing particles leads to hydration of the nanoparticle surface. The calcination of the samples results in the formation of E -Fe2O3 oxide in a strongly disordered or amorphous state in iron-containing particles on the surface of silica gel.

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Держатели документа:
[Bukhtiyarova, G. A.
Mart'yanov, O. N.
Yakushkin, S. S.
Shuvaeva, M. A.] Russian Acad Sci, Siberian Branch, Boreskov Inst Catalysis, Novosibirsk 630090, Russia
[Bayukov, O. A.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, pr. Akademika Lavrent'eva 5, Novosibirsk 630090, Russian Federation
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok 50, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Bukhtiyarova, G. A.; Mart'yanov, O. N.; Yakushkin, S. S.; Shuvaeva, M. A.; Bayukov, O. A.; Баюков, Олег Артемьевич
}
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10.

Evolution of the structure and magneto-optical properties of Mn (x) Fe3-x O-4 films prepared by solid-state reactions / I. S. Edelman [et al.] // Phys. Solid State. - 2008. - Vol. 50, Is. 12. - P. 2289-2294, DOI 10.1134/S106378340812010X. - Cited References: 13. - We are grateful to G.N. Bondarenko for x-ray diffraction measurements.This study was supported by the Russian Foundation for Basic Research (project no. 07-02-92174_ NTsNI) and the Program "Development of the Scientific Potential of the Higher Education School." . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
MOSSBAUER
Аннотация: This paper reports on the results of investigations into the structure and the magnetic and magnetooptical properties of thin films Mn (x) Fe3 - x O-4 prepared by solid-state reactions: isothermal annealing, self-propagating high-temperature synthesis, and a combination of these two regimes. The regimes favorable for the formation of films close in composition and structure to the stoichiometric compounds MnFe2O4 or Fe3O4 are established. The features observed in the spectral response of the magneto-optical Faraday effect and of the magnetic circular dichroism of the MnFe2O4 films are considered in terms of the electronic transitions in magnetic ions, primarily Fe3+, which occupy octahedral positions in the spinel structure.

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Держатели документа:
[Edelman, I. S.
Polyakova, K. P.
Polyakov, V. V.
Bayukov, O. A.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Ivanova, O. S.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, Svobodny pr. 79, Krasnoyarsk 660041, Russian Federation

Доп.точки доступа:
Edelman, I. S.; Эдельман, Ирина Самсоновна; Ivanova, O.; Polyakova, K.; Polyakov, V.; Bayukov, O. A.; Баюков, Олег Артемьевич
}
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11.

Electronic properties of Fe1-xVxBO3 at ambient conditions and at high pressure / N. V. Kazak [et al.] // J. Phys.: Condens. Matter. - 2005. - Vol. 17: 2nd International Symposium on Physics of Solids Under High Pressure Using Nuclear Probes (JUL 20-24, 2004, Cologne, GERMANY), Is. 11. - P. S795-S800, DOI 10.1088/0953-8984/17/11/008. - Cited References: 16 . - ISSN 0953-8984

РУБ Physics, Condensed Matter
Рубрики:
FEBO3 SINGLE-CRYSTALS
   SOLID-SOLUTIONS
   BAND-STRUCTURE
   TRANSITION
   MOSSBAUER
   MAGNETIZATION
   MODEL
   VBO3
Кл.слова (ненормированные):
Electronic properties -- Ferrimagnetic materials -- High pressure effects -- High temperature superconductors -- Metal insulator transition -- Single crystals -- Superconductivity -- Thermal effects -- Carrier localization -- Correlation effects -- Critical pressure -- Semiconducting behavior -- Oxide superconductors
Аннотация: We present the results of an in-plane resistivity study of the solid solutions Fe1-xVxBO3. The measurements were made on single crystals with concentration x = 0.02, 0.13, 0.18, 0.3, 0.95, 1.0 in the temperature range 220-600 K. Semiconducting behaviour for samples with x >= 0.13 was found. Mott variable-range-hopping transport rho(T) = rho(0)exp(T*/T)(alpha) has been observed with alpha = 1/4 at T <290 K, suggesting carrier localization. Above this temperature the activation-type conductivity, with activation energies, E-a, about 1 eV for all samples, is observed. The possible electronic states and band structure of Fe1-xVx BO3 crystals are discussed in the different pressure ranges: P < P-c(Fe), p(c)(Fe) < p < p(c)(V) P > P-c(V) where p(c)(Fe) P-c(V) are the critical pressure values for FeBO3 and VBO3, respectively.

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Держатели документа:
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia
Univ Cologne, Inst Phys 2, D-50937 Cologne, Germany
Krasnoyarsk State Tech Univ, Krasnoyarsk 660074, Russia
II Physikalisches Institut, Universitat zu Koeln, 50937 Koeln, Germany
Krasnoyarsk State Tech. University, 660074 Krasnoyarsk, Russian Federation

Доп.точки доступа:
Kazak, N. V.; Казак, Наталья Валерьевна; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Abd-Elmeguid, M. M.; Ivanova, N. B.; Иванова, Наталья Борисовна
}
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12.

Analysis of the electrical and optical properties of VBO3 single crystals and Fe1-xVxBO3 solid solutions on the basis of a many-electron model of energy band structure / N. B. Ivanova [et al.] // Phys. Solid State. - 2004. - Vol. 46, Is. 8. - P. 1462-1468, DOI 10.1134/1.1788779. - Cited References: 32. - One of the authors (M.M.A.) would like to thank the Deutsche Forschungsgemeinschaft (SFB608) for financial support. This study was supported by the Russian Foundation for Basic Research (project no. 03-02-16286), the program "Integration" (project no. B0017), and the program of the Division of Physical Sciences of the Russian Academy of Sciences "Strongly Correlated Electrons" . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
MAGNETIC-PROPERTIES
   CALCITE STRUCTURE
   PHASE-TRANSITION
   FERRIC BORATE
   HIGH-PRESSURE
   FEBO3
   FE1-XCRXBO3
   FERROMAGNET
   MOSSBAUER
   SPECTRA
Аннотация: A many-electron model of the energy band structure of VBO3 and of Fe1 - xVxBO3 solid solutions is proposed with strong electron correlations taken into account. Experimental optical absorption spectra and data on the resistivity are discussed in the framework of the suggested model. Variation in the magnetic and electronic properties of VBO3 and Fe1 - xVxBO3 under high pressure is predicted. For VBO3, a Mott-Hubbard (insulator-metal) transition is expected in the high-pressure phase. In Fe1 - xVxBO3 solid solutions, a nontrivial variation in the properties is predicted, leading to the appearance of a different magnetic state. (C) 2004 MAIK "Nauka / Interperiodica".

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Публикация на русском языке Анализ электрических и оптических свойств монокристаллов VBO[3] и твердых растворов Fe[1-x]V[x]BO[3] на основе многоэлектронной модели из зонной структуры [Текст] / Н. Б. Иванова [и др.] // Физ. тверд. тела. - 2004. - Т. 46 Вып. 8. - С. 1422-1427

Держатели документа:
Krasnoyarsk State Tech Univ, Krasnoyarsk 660074, Russia
Russian Acad Sci, Siberian Div, Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Univ Cologne, Inst Phys 2, D-50937 Cologne, Germany
ИФ СО РАН
Krasnoyarsk State Tech. University, Krasnoyarsk, 660074, Russian Federation
II. Physikalisches Institut, Universitat zu Koln, Koln, 50937, Germany

Доп.точки доступа:
Ivanova, N. B.; Иванова, Наталья Борисовна; Kazak, N. V.; Казак, Наталья Валерьевна; Markov, V. V.; Марков, Владимир Витальевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Rudenko, V. V.; Руденко, Валерий Васильевич; Abd-Elmeguid, M. M.
}
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13.

Frolov, G. I.
Phase composition of nanocrystalline iron films deposited in a nitrogen atmosphere / G. I. Frolov, V. S. Zhigalov, O. A. Bayukov // Phys. Solid State. - 1999. - Vol. 41, Is. 10. - P. 1669-1671, DOI 10.1134/1.1131050. - Cited References: 14 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
ELECTRON-MICROSCOPY
MOSSBAUER
Аннотация: The phase composition of iron films prepared by pulsed-plasma deposition in a controlled nitrogen atmosphere is investigated by Mossbauer spectroscopy. The observed changes in the phase composition are dictated by the nanocrystalline structure of the samples and the dynamics of the substrate temperature during film deposition. (C) 1999 American Institute of Physics. [S1063-7834(99)02110-3].

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Публикация на русском языке Фролов, Георгий Иванович. Фазовый состав нанокристаллических пленок железа, осажденных в атмосфере азота [Текст] / Г. И. Фролов, В. С. Жигалов, О. А. Баюков // Физ. тверд. тела. - Санкт-Петербург, 1999. - Т. 41 Вып. 10. - С. 1819-1821

Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН

Доп.точки доступа:
Zhigalov, V. S.; Жигалов, Виктор Степанович; Bayukov, O. A.; Баюков, Олег Артемьевич; Фролов, Георгий Иванович
}
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14.

Magnetostriction of FexMn1-xS (x=0.27) Crystals / G. M. Abramova [et al.] // JETP Letters. - 2009. - Vol. 90, Is. 3. - P. 207-210, DOI 10.1134/S0021364009150107. - Cited References: 19. - This work was supported by the Siberian Branch, Russian Academy of Sciences, and INTAS, joint project no. 06-1000013-9002. . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
ALPHA-MNS
   SINGLE-CRYSTALS
   TRANSITION
   MOSSBAUER
Аннотация: The magnetostriction of FexMn1-xS (x = 0.27) single crystals in strong magnetic fields up to 120 kOe has been investigated. It has been found that the magnetostriction reaches colossal values (+/-3 x 10(-4)) atypical of compounds of 3d elements. It has been found that the magnetostriction changes sign when varying temperature and magnetic field; this behavior indicates an important role of the spin-phonon interactions in the formation of the magnetic order in solid solutions of iron-manganese sulfides.

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Держатели документа:
[Abramova, G. M.
Petrakovskiy, G.
Bovina, A. F.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Zuberek, R.
Nabialek, A.] Polish Acad Sci, Inst Phys, PL-02668 Warsaw, Poland
[Boem, M.] Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France
[Sokolov, V.] Russian Acad Sci, Nikolaev Inst Inorgan Chem, Siberian Branch, Novosibirsk 630090, Russia
[Petrakovskiy, G.] Siberian Fed Univ, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Institute of Physics, Polish Academy of Sciences, PL-02-668 Warsaw, Poland
Institut Laue-Langevin, Grenoble, France
Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk 630090, Russian Federation
Siberian Federal University, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Abramova, G. M.; Абрамова, Галина Михайловна; Petrakovskiy, G. A.; Петраковский, Герман Антонович; Zuberek, R.; Nabialek, A.; Boem, M.; Sokolov, V. V.; Соколов В. В.; Bovina, A. F.; Бовина, Ася Федоровна; Siberian Branch, Russian Academy of Sciences; INTAS [06-1000013-9002]
}
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15.

    Catalytic properties and nature of active centers of ferrospheres in oxidative coupling of methane / A. G. Anshits [et al.] // Appl. Catal. A-Gen. - 2016. - Vol. 524. - P. 192-199, DOI 10.1016/j.apcata.2016.06.032. - Cited References:47. - This study was supported by the Russian Science Foundation (project no. 14-13-00289). . - ISSN 0926-860X. - ISSN 1873-3875
   Перевод заглавия: Каталитические свойства и природа активных центров ферросфер в оксидативной связи метана

РУБ Chemistry, Physical + Environmental Sciences
Рубрики:
GLASS CRYSTAL CATALYSTS
   MAGNETIC-PROPERTIES
   PROFILE REFINEMENT
   FLY-ASH
   MOSSBAUER
   MICROSPHERES
   PERFORMANCE
   CONVERSION
   ETHYLENE
   OXIDE
Кл.слова (ненормированные):
Methane coupling -- Active center -- Ferrospinel -- Mossbauer spectroscopy
Аннотация: Ferrospheres with the Fe2O3 content in the range from 76 to 97 wt% were applied as catalysts for the oxidative coupling of methane (OCM). To identify their phase composition and distribution of iron sites, the ferrospheres were characterized by X-ray powder diffraction and Mossbauer spectroscopy before and after the OCM reaction. Magnetite-based ferrite spinel, hematite and aluminosilicate glasses were established to be the main phases. The ferrospinel of all ferrospheres partially oxidized to hematite after the OCM reaction. It was established that the yield of C-2-hydrocarbons sharply increased at the ferrospheres with Fe2O3 content higher than 89 wt% The spinel phase of these ferrospheres includes Fevv3+(B) sites with a Ca2+ tetrahedral cation and an octahedral cation vacancy among the nearest neighbors. A linear correlation between the yield of C-2-hydrocarbons (ethane and ethylene) and the content of such sites was established, thus indicating that their electrophilic oxygen species participate in selective CH4 conversion to C2H6. (C) 2016 Elsevier B.V. All rights reserved.

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Держатели документа:
Russian Acad Sci, Siberian Branch, Inst Chem & Chem Technol, Akad Gorodok 50-24, Krasnoyarsk 660036, Russia.
Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Akad Gorodok 50-38, Krasnoyarsk 660036, Russia.
Univ Rostock, Leibniz Inst Katalyse eV, Albert Einstein Str 29 a, D-18059 Rostock, Germany.

Доп.точки доступа:
Anshits, A. G.; Bayukov, O. A.; Баюков, Олег Артемьевич; Kondratenko, E. V.; Anshits, N. N.; Pletnev, O. N.; Плетнев, Олег Николаевич; Rabchevskii, E. V.; Solovyov, L. A.; Russian Science Foundation [14-13-00289]
}
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16.

Change in the magnetic properties of nanoferrihydrite with an increase in the volume of nanoparticles during low-temperature annealing / D. A. Balaev [et al.] // Phys. Solid State. - 2016. - Vol. 58, Is. 9. - P. 1782-1791, DOI 10.1134/S1063783416090092. - Cited References: 32. - This study was supported by the Ministry of Education and Science of the Russian Federation within the State Task for 2014-2016. . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
FERRIHYDRITE NANOPARTICLES
   BACTERIAL FERRIHYDRITE
   FERRITIN
   HYSTERESIS
   MOSSBAUER
   ORIGIN
Аннотация: The results of the investigation into the effect of low-temperature annealing of a powder of nanoparticles of bacterial ferrihydrite on its magnetic properties have been presented. It has been found that an increase in the time (up to 240 h) and temperature (in the range from 150 to 200°C) of annealing leads to a monotonic increase in the superparamagnetic blocking temperature, the coercive force, and the threshold field of the opening of the magnetic hysteresis loop (at liquid-helium temperatures), as well as to an increase in the magnetic resonance line width at low temperatures and in the magnetic susceptibility at room temperature. At the same time, according to the results of the analysis of the Mossbauer spectra, the annealing of ferrihydrite does not lead to the formation of new iron oxide phases. Most of these features are well consistent with the fact that the low-temperature annealing of ferrihydrite causes an increase in the size of nanoparticles, which is confirmed by the results of transmission electron microscopy studies. © 2016, Pleiades Publishing, Ltd.

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Публикация на русском языке Изменение магнитных свойств наноферригидрита в ходе низкотемпературного отжига, обусловленное ростом объeма наночастиц [Текст] / Д. А. Балаев [и др.] // Физ. тверд. тела : Физико-технический институт им. А. Ф. Иоффе РАН, 2016. - Т. 58 Вып. 9. - С. 1724–1732

Держатели документа:
Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Akademgorodok 50/38, Krasnoyarsk, Russian Federation
Siberian Federal University, Svobodny pr. 79, Krasnoyarsk, Russian Federation
International Scientific Centre for Organism Extreme States Research, Presidium of the Krasnoyarsk Scientific Centre of the Siberian Branch of the Russian Academy of Sciences, Akademgorodok 50, Krasnoyarsk, Russian Federation
International Laboratory of High Magnetic Fields and Low Temperatures, ul. Gajowicka 95, Wroclaw, Poland

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Krasikov, A. A.; Красиков, Александр Александрович; Stolyar, S. V.; Столяр, Сергей Викторович; Iskhakov, R. S.; Исхаков, Рауф Садыкович; Ladygina, V. P.; Yaroslavtsev, R. N.; Bayukov, O. A.; Баюков, Олег Артемьевич; Vorotynov, A. M.; Воротынов, Александр Михайлович; Volochaev, M. N.; Волочаев, Михаил Николаевич; Dubrovskiy, A. A.; Дубровский, Андрей Александрович
}
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17.

Synthesis and magnetic properties of the core-shell Fe3O4/CoFe2O4 nanoparticles / D. A. Balaev, S. V. Semenov, A. A. Dubrovskii [et al.] // Phys. Solid State. - 2020. - Vol. 62, Is. 2. - P. 285-290, DOI 10.1134/S1063783420020043. - Cited References: 37. - This study was supported by the Russian Science Foundation, project no. 17-12-01111. . - ISSN 1063-7834. - ISSN 1090-6460

РУБ Physics, Condensed Matter
Рубрики:
MOSSBAUER
ENSEMBLE
Кл.слова (ненормированные):
oxide nanoparticles -- core-shell structure -- coercivity
Аннотация: The Fe3O4/CoFe2O4 nanoparticles with a core-shell structure with an average size of 5 nm have been obtained by codeposition from the iron and cobalt chloride solutions. An analysis of the magnetic properties of the obtained system and their comparison with the data for single-phase Fe3O4 (4 nm) and CoFe2O4 (6 nm) nanoparticles has led to the conclusion about a noticeable interaction between the soft magnetic (Fe3O4) and hard magnetic (CoFe2O4) phases forming the core and shell of hybrid particles.

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Публикация на русском языке Синтез и магнитные свойства наночастиц Fe3O4/CoFe2O4 со структурой ядро/оболочка [Текст] / Д. А. Балаев, С. В. Семенов, А. А. Дубровский [и др.] // Физ. тверд. тела. - 2020. - Т. 62 Вып. 2. - С. 235-240

Держатели документа:
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk Sci Ctr, Krasnoyarsk 660036, Russia.
Russian Acad Sci, Boreskov Inst Catalysis, Siberian Branch, Novosibirsk 630090, Russia.

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Semenov, S. V.; Семёнов, Сергей Васильевич; Dubrovskii, A. A.; Дубровский, Андрей Александрович; Krasikov, A. A.; Красиков, Александр Александрович; Popkov, S. I.; Попков, Сергей Иванович; Yakushkin, S. S.; Kirillov, V. L.; Mart'yanov, O. N.; Russian Science FoundationRussian Science Foundation (RSF) [17-12-01111]
}
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18.

Effect of calcination temperature on activity of Fe2O3-Al2O3 nanocomposite catalysts in CO oxidation / A. M. Kremneva, A. V. Fedorov, O. A. Bulavchenko [et al.] // Catal. Lett. - 2020. - Vol. 150. - P. 3377-3385, DOI 10.1007/s10562-020-03250-8. - Cited References: 31. - This work was supported by the Russian Science Foundation (Grant No. 17-73-20157). The experiments were performed using facilities of the shared research center "National center of investigation of catalysts" at Boreskov Institute of Catalysis. The authors thank A.Yu. Gladky for the TPR measurements and Z.S. Vinokurov for the XRD measurements. . - ISSN 1011-372X. - ISSN 1572-879X

РУБ Chemistry, Physical
Рубрики:
MOSSBAUER
   SPECTROSCOPY
   CHEMISTRY
   IRON
   XPS
   ADSORPTION
   OXYGEN
   FE
Кл.слова (ненормированные):
Environmental catalysis -- Nanostructure -- Gasification -- Oxidation -- Mossbauer spectroscopy
Аннотация: Nanocomposite Fe–Al oxide catalysts were prepared by the melting of iron and aluminum nitrates with the subsequent calcination in air at different temperatures. It was found that the catalysts calcined at 450 °C are more active in the oxidation of CO than the catalysts calcined at 700 °C. X-ray diffraction and X-ray photoelectron spectroscopy showed that all the catalysts consist of hematite, α-Fe2O3 nanoparticles, and Al2O3 in an amorphous state. Iron oxide is the active component, which provides the oxidation of CO, while alumina is a texture promoter. The increase in the calcination temperature leads to a minor increase in the average size of hematite nanoparticles and an insignificant decrease in the specific surface area. Kinetic measurements showed that the oxidation of CO over the Fe–Al catalysts calcined at 450 and 700 °C proceeds with the activation energy of 61–69 and 91 kJ/mol, respectively. This means that the low-temperature and high-temperature catalysts contain different active species. Temperature-programmed reduction with CO indicated that the decrease in the calcination temperature improves the reducibility of the Fe-Al nanocomposites. According to 57Fe Mössbauer spectroscopy, the low-temperature catalysts contain hydrated iron oxides (acagenite and ferrihydrite) and a significant amount of highly defective hematite, which is absent in the high-temperature catalyst. These species can provide the enhanced activity of the low-temperature catalysts in the oxidation of CO.

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Держатели документа:
Boreskov Inst Catalysis, Novosibirsk 630090, Russia.
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Kremneva, A. M.; Fedorov, A. V.; Bulavchenko, O. A.; Knyazev, Yu. V.; Князев, Юрий Владимирович; Saraev, A. A.; Yakovlev, V. A.; Kaichev, V. V.; Russian Science FoundationRussian Science Foundation (RSF) [17-73-20157]; National center of investigation of catalysts" at Boreskov Institute of Catalysis
}
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19.

Biogenic ferrihydrite nanoparticles produced by Klebsiella oxytoca: Characterization, physicochemical properties and bovine serum albumin interactions / N. Cazacu, C. G. Chilom, S. Iftimie [et al.] // Nanomaterials. - 2022. - Vol. 12, Is. 2. - Ст. 249, DOI 10.3390/nano12020249. - Cited References: 59. - This research was funded by JINR Themes 02-1-1107-2011/2021, 04-5-1131-2017/2021 and 04-4-1133-2018/2023 and with the financial support of the RO-JINR Projects Nos. 366/11.05.2021 (items 7, 86, 97) and 365/11.05.2021 (items 8, 87 and 98). This work also benefited from the use of the SasView application, originally developed under NSF Award DMR-0520547. SasView also contains the code developed with funding from the EU Horizon 2020 program under the SINE2020 project Grant No 654000. The APC was funded by JINR Theme 02-1-1107-2011/2021, Project No. 366/11.05.2021, item 7. This study used the infrastructure of the Applied Genetics Resource Facility of MIPT (Suport Grant 075-15-2021-684) . - ISSN 2079-4991

РУБ Chemistry, Multidisciplinary + Nanoscience & Nanotechnology + Materials Science, Multidisciplinary + Physics, Applied
Рубрики:
MAGNETIC-PROPERTIES
   REDUCTION
   MOSSBAUER
   FERRITIN
   DOCKING
   BINDING
Кл.слова (ненормированные):
biogenic ferrihydrite nanoparticles -- the binding mechanism -- energy transfer -- protein stability -- molecular docking
Аннотация: The synthesis of nanoparticles inside microorganisms is an economical alternative to chemical and physical methods of nanoparticle synthesis. In this study, ferrihydrite nanoparticles synthesized by Klebsiella oxytoca bacterium in special conditions were characterized by scanning electron microscopy (SEM), energy-dispersive X-ray analysis (EDS), small-angle X-ray (SAXS), UV-Vis spectroscopy, fluorescence, fluorescence resonance energy transfer (FRET), and molecular docking. The morphology and the structure of the particles were characterized by means of SEM and SAXS. The elemental content was determined by means of the EDS method. The absorption properties of the ferrihydrite nanoparticles were investigated by UV-Vis spectroscopy. The binding mechanism of the biogenic ferrihydrite nanoparticles to Bovine Serum Albumin (BSA) protein, studied by fluorescence, showed a static and weak process, combined with FRET. Protein denaturation by temperature and urea in the presence of the ferrihydrite nanoparticles demonstrated their influence on the unfolding process. The AutoDock Vina and UCSF Chimera programs were used to predict the optimal binding site of the ferrihydrite to BSA and to find the location of the hydrophobic cavities in the sub-domain IIA of the BSA structure.

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Держатели документа:
Univ Bucharest, Fac Phys, Dept Elect Solid State & Biophys, RO-077125 Magurele, Romania.
Horia Hulubei Natl Inst Phys & Nucl Engn, Dept Nucl Phys, RO-077125 Magurele, Romania.
Joint Inst Nucl Res, Dubna 141980, Russia.
Moscow Inst Phys & Technol, Dolgoprudnyi 141701, Russia.
Russian Acad Sci, Siberian Branch, Fed Res Ctr KSC, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Sch Engn Phys & Radio Elect, Phys Dept, Krasnoyarsk 660041, Russia.
Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Cazacu, Nicoleta; Chilom, Claudia G.; Iftimie, Sorina; Balasoiu, Maria; Ladygina, Valentina P.; Stolyar, S. V.; Столяр, Сергей Викторович; Orelovich, Oleg L.; Kovalev, Yuriy S.; Rogachev, Andrey V.
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