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Cation Distribution in the Composite Materials of the CaFe2O4-α-Fe2O3 Series / Y. V. Knyazev [et al.] // J. Struct. Chem. - 2019. - Vol. 60, Is. 5. - P. 763-771, DOI 10.1134/S0022476619050081. - Cited References: 25. - The study was performed with the financial support of the Russian Foundation for Basic Research, the Government of the Krasnoyarsk Krai, the Krasnoyarsk Regional Science Foundation within the project No. 18-42-243011 "The effect of the composition and the defective structure of CaFe2O4 based "core-shell" composite materials on their electronic and catalytic properties" and the UMNIK program. . - ISSN 0022-4766. - ISSN 1573-8779

РУБ Chemistry, Inorganic & Nuclear + Chemistry, Physical
Рубрики:
PD/P-TYPE CAFE2O4
OXYGEN
CONDUCTIVITY
Кл.слова (ненормированные):
solid-phase synthesis -- scanning electron microscopy -- Mössbauer spectroscopy -- cation vacancies
Аннотация: Structured composite materials CaFe2O4-α-Fe2O3 (α-Fe2O3 content is 2–82 wt.%) are obtained with the method of solid-phase synthesis at 1000 °C. The phase composition of the samples is studied using powder X-ray diffraction. It is shown that the content of CaFe2O4 and α-Fe2O3 phases changes linearly, depending on the composition of the starting material. The scanning electron microscopy data indicate the formation of a two-phase system α-Fe2O3-CaFe2O4. The Mössbauer spectroscopy data at room temperature testify the formation of cationic iron vacancies in the CaFe2O4 crystal structure in the absence of α-Fe2O3 structural defects. Cationic vacancies can be formed during the synthesis in the atmosphere of air.

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Публикация на русском языке Особенности катионного распределения в композиционных материалах ряда СaFe2O4—α-Fe2O3 [Текст] / Ю. В. Князев [и др.] // Журн. структ. химии. - 2019. - Т. 60 № 5. - С. 796-805

Держатели документа:
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Fed Krasnoyarsk Res Ctr, Krasnoyarsk, Russia.
Russian Acad Sci, Inst Chem & Chem Technol, Siberian Branch, Fed Krasnoyarsk Res Ctr, Krasnoyarsk, Russia.

Доп.точки доступа:
Knyazev, Yu. V.; Князев, Юрий Владимирович; Shishkina, N. N.; Bayukov, O. A.; Баюков, Олег Артемьевич; Kirik, N. P.; Solovyov, L. A.; Zhizhaev, A. M.; Rabchevsky, E. V.; Anshits, A. G.; Russian Foundation for Basic Research; Government of the Krasnoyarsk Krai; Krasnoyarsk Regional Science Foundation [18-42-243011]; UMNIK program
}
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Balaev, D. A.
Tunnel Conductivity and Tunnel Magnetoresistance of the Fe-SiO Films: Interplay of the Magnetotransport and Magnetic Properties / D. A. Balaev, A. D. Balaev // Phys. Solid State. - 2019. - Vol. 61, Is. 7. - P. 1203-1210, DOI 10.1134/S1063783419070047. - Cited References: 48 . - ISSN 1063-7834. - ISSN 1090-6460

РУБ Physics, Condensed Matter
Рубрики:
GIANT MAGNETORESISTANCE
   GRANULAR FILMS
   TEMPERATURE
   TRANSPORT
Аннотация: The electrical properties of a system of nanogranular amorphous Fe–SiO films with a SiO concentration between 0 and 92 vol % have been investigated. The samples with a low SiO content are characterized by the metal-type conductivity. With an increase in the dielectric content x in the films, the concentration transition from the metal to tunneling conductivity occurs at x ≈ 0.6. At the same concentration, the ferromagnet–superparamagnet transition is observed, which was previously investigated by the magnetic method. The temperature dependences of the electrical resistivity ρ(T) for the compositions corresponding to the dielectric region obey the law ρ(T) ~ exp(2(C/kT)1/2), which is typical of the tunneling conductivity. The estimation of the metal grain sizes from the tunneling activation energy C has shown good agreement with the sizes obtained previously by analyzing the magnetic properties. In the dielectric region of the compositions, the giant magnetoresistive effect attaining 25% at low temperatures has been obtained.

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Публикация на русском языке

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

Доп.точки доступа:
Balaev, A. D.; Балаев, Александр Дмитриевич; Балаев, Дмитрий Александрович
}
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Electrophysical properties of hydroxylated endohedral metallofullerene with gadolinium / A. I. Dudnik [et al.] // J. Phys. Chem. Solids. - 2019. - Vol. 135. - Ст. 109094, DOI 10.1016/j.jpcs.2019.109094. - Cited References: 35. - The reported study was funded by RFBR according to the research project No 18-29-19003. . - ISSN 0022-3697
Кл.слова (ненормированные):
Endohedral metallofullerene -- Fullerenol -- Impedance -- Dielectric permittivity -- Ionic and proton conductivity -- Dielectric hysteresis -- Polarizability
Аннотация: The paper presents the results of experimental measurements of constitutive and electrophysical properties in hydroxylated endohedral metallofullerene with gadolinium sample. We extracted endohedral metallofullerene from carbon condensate, synthesized in high-frequency arc discharge plasma. Later hydroxyl groups were added. Via methods of infrared and x-ray photoelectronic spectroscopy, it was established that the molecules of hydroxylated endohedral metallofullerene have the Gd@C82Ox(OH)y, x + y=(40–42) composition. The method of measuring the electrical impedance in the frequency range from 100 Hz to 100 MHz shows that the resulting hydroxylated fullerene is an ion conductor. The measured frequency dependences of the dielectric permittivity and conductivity of hydroxylated fullerene are explained based on the assumption of an inhomogeneous distribution of electric charges in the material volume. Dielectric-hysteresis loops in the frequency range of 25 Hz–1 MHz and temperature range of 80–300 K, and volt-ampere characteristics were measured. The obtained results imply the appearance of residual polarization induced by the electric field in hydroxylated fullerene. However, the constant dipole moment is absent. © 2019

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation
Institute of Chemistry and Chemical Technology SB RAS, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Dudnik, A. I.; Дудник, Александр Иванович; Vnukova, N. G.; Внукова, Наталья Григорьевна; Drokin, N. A.; Дрокин, Николай Александрович; Bondarev, V. S.; Бондарев, Виталий Сергеевич; Shestakov, N. P.; Шестаков, Николай Петрович; Tomashevich, Y. V.; Churilov, G. N.; Чурилов, Григорий Николаевич
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SiCxNy:Fe films as a tunable ferromagnetic material with tailored conductivity / R. Pushkarev [et al.] // J. Mater. Chem. C. - 2019. - Vol. 7, Is. 14. - P. 4250-4258, DOI 10.1039/c9tc00299e. - Cited References: 51 . - ISSN 2050-7526. - ISSN 2050-7534

РУБ Materials Science, Multidisciplinary + Physics, Applied
Рубрики:
ROOM-TEMPERATURE FERROMAGNETISM
SILICON CARBONITRIDE FILMS
Аннотация: Amorphous ferromagnetic materials with variable composition are promising candidates for application in rapidly-growing technological fields, such as spintronics. However, the significant downside of current state-of-the-art materials is a conductivity mismatch between the injector and the semiconductor, which often is associated with the inability to control and precisely tailor the magnetic properties and conductivity. We report on the synthesis of soft-magnetic SiCxNy:Fe films with a saturation magnetization of 20 emu cm−3 and a conductivity similar to the one of Si, which is crucial for possible applications. XRD with synchrotron radiation and EXAFS revealed the complex composite structure of the films: crystals of Fe3Si, Fe5Si3, SiC and graphite are embedded into the amorphous matrix of SiCxNy. Variation of the deposition conditions allowed us to separately control the magnetic properties through the iron concentration and the conductivity of the material through the amorphous SiCxNy matrix composition. The reported results revealed significant potential of SiCxNy:Fe films as a prospective object for analysis of spin-polarized transport in amorphous semiconductors and for application in the field of spintronics.

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Держатели документа:
Russian Acad Sci, Nikolaev Inst Inorgan Chem, Siberian Branch, Pr Acad Lavrentev 3, Novosibirsk 630090, Russia.
Russian Acad Sci, Rzhanov Inst Semicond Phys, Siberian Branch, Pr Acad Lavrentev 13, Novosibirsk 630090, Russia.
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Akademgorodok 50,38, Krasnoyarsk 660036, Russia.
Ural Fed Univ, St Mira 19, Ekaterinburg 620002, Russia.
Russian Acad Sci, Budker Inst Nucl Phys, Siberian Branch, Pr Acad Lavrentev 11, Novosibirsk 630090, Russia.
ESRF, Rossendorf Beamline, F-38043 Grenoble, France.
HZDR, Inst Resource Ecol, D-01314 Dresden, Germany.

Доп.точки доступа:
Pushkarev, Roman; Fainer, Nadezhda; Kirienko, Victor; Matsynin, A. A.; Мацынин, Алексей Александрович; Nadolinnyy, Vladimir; Merenkov, Ivan; Trubina, Svetlana; Ehrenburg, Simon; Kvashnina, Kristina
}
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    Синтез и электрофизические свойства композитов на основе сверхвысокомолекулярного полиэтилена и углеродных нанотрубок / И. А. Маркевич [и др.] // Журн. СФУ. Техн. и технол. - 2018. - Т. 11, № 2. - С. 190-197 ; J. Sib. Fed. Univ. Eng. Technol., DOI 10.17516/1999-494X-0022. - Библиогр.: 8. - Работа выполнена при поддержке Фонда содействия развитию малых форм предприятий в научно-технической сфере в рамках договора № 9594ГУ/2015 от 01.02.2016. . - ISSN 1999-494X
   Перевод заглавия: Synthesis and electrophysical properties of ultrahigh-molecular-weight polyethylene and carbon nanotubes based composites
Кл.слова (ненормированные):
композиты -- сверхвысокомолекулярный полиэтилен -- углеродные нанотрубки -- диэлектрическая проницаемость -- проводимость -- composites -- ultrahigh-molecular-weight polyethylene -- carbon nanotubes -- dielectric permittivity -- conductivity
Аннотация: Получены композиты на основе сверхвысокомолекулярного полиэтилена и углеродных нанотрубок методом смешивания компонентов в ксилоле при определенных температурах. Комплексные проводимости и диэлектрические проницаемости образцов материалов измерены в диапазоне частот от 100 Гц до 1 ГГц. Установлены условия синтеза как электропроводящих, так и диэлектрических композитов. При этом величина проводимости зависит не только от концентрации углеродных нанотрубок, но и от структуры их распределения в полимерной матрице, которая, в свою очередь, зависит от температурных условий получения композита.
Composites based on ultrahigh-molecular-weight polyethylene and carbon nanotubes were obtained by mixing the components in xylene at certain temperatures. The complex conductivities and permittivities of the material samples were measured in the frequency range from 100 Hz to 1 GHz. The conditions for the synthesis of both electrically conducting and dielectric composites were established. The conductivity depends not only on the concentration of carbon nanotubes, but also on the structure of their distribution in the polymer matrix, which in turn depends on the temperature conditions for obtaining the composite.

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Держатели документа:
Институт химии и химической технологии СО РАН ФИЦ «Красноярский научный центр СО РАН»
Институт физики им. Л.В. Киренского СО РАН ФИЦ «Красноярский научный центр СО РАН»
Сибирский федеральный университет

Доп.точки доступа:
Маркевич, И. А.; Markevich I. A.; Селютин, Г. Е.; Selyutin G. E.; Дрокин, Николай Александрович; Drokin, N. A.; Беляев, Борис Афанасьевич; Belyaev, B. A.

}
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    Теплоперенос в щелевых каналах / Т. А. Енютина [и др.] // Вестник КрасГАУ. - 2018. - Вып. 3. - С. 78-83. - Библиогр.: 5 . - ISSN 1819-4036
   Перевод заглавия: Heat transfer in annular channels
Кл.слова (ненормированные):
конвективный теплообмен -- теплопроводность -- коэффициент теплоотдачи -- тепловой поток -- плотность теплового потока -- convective heat exchange -- heat conductivity -- heat transfer coefficient -- heat flux -- heat flux density
Аннотация: С целью создания дополнительной защиты боевой одежды пожарных от перегрева была разработана конструкция специального вкладыша, содержащего эле-менты из материала с памятью формы. Устройство имеет щелевое пространство, заполняемое азотом, поступающим из специального баллончика. Для разработки вкладыша необходимо знать теплотехнические характеристики, в частности коэффициенты теплоотдачи для вычисления тепловых потоков. Цель исследования: проведение анализа системы дифференциаль-ных уравнений применительно к данному конкретному случаю теплопереноса, получение расчетных формул для местного (локального) и среднего коэффициентов теплоотдачи, расчет тепловых потоков Q для двух инертных газов - азота и гелия. На основании получен-ных результатов были сделаны следующие выводы: 1) сформулированы упрощения для решения системы дифференциальных уравнений конвективного теплообмена; 2) получены уравнения для вычисления местного (локального) коэффициента теплоотдачи и среднего по высоте плоской стенки коэффициента теплоотдачи для случая свободного движения потока газа в ограниченном пространстве; 3) результаты анализа системы дифференциальных уравнений позволяют рассчитать тепловые потоки для щелевых пространств в условиях переноса теплоты, что достаточно часто встречается в технических устройствах, в частности, для уменьшения тепловых потерь в окружающую среду (создание тонких воздушных слоев в обмуровке паровых котлов и промышленных печей, в тепловой изоляции трубопроводов отопления и горячего водоснабжения и так далее); 4) выполнены расчеты тепловых потоков для инертных газов - азота и гелия, результаты которых указывают, что для заполнения пространства защитного вкладыша следует использовать азот.
In order to create additional protection of fighting clothes for firefighters against overheating the design of special insert containing elements from material with shape memory was developed. The construction has slot-hole space filled by the nitrogen arriving from special barrel. For the development of the insert it is necessary to know heat technical characteristics, in particular heat transfer coefficients. The research ob-jective was carrying out the analysis of the system of differential equations in relation to this concrete case of heat transfer, receiving settlement formulas for local and average heat transfer coefficients, calculation of Q thermal streams for two inert gases, i.e. nitrogen and helium. On the basis of received results the following conclusions were drawn: 1) simplifications for the decision of the system of differential equations of convective heat exchange were formulated; 2) the equations for calculation of local coefficient of thermolysis and the aver-age on height of a flat wall of coefficient of thermolysis for the case of free movement of the stream of gas in limited space were received; 3) the results of the analysis of the system of differential equations allowed to calculate thermal streams for slot-hole spaces in the conditions of warmth transfer that rather often meets in technical devices, in particular, for the reduction of thermal losses in the environment (creation of thin air beds in a brickwork envelope of boilers and industrial furnaces, in thermal isolation of pipelines of heating and hot water supply and so on); 4) calculations of thermal streams for inert gases, i.e. nitrogen and helium were executed which results specified that for filling the space of protective insert it was necessary to use nitrogen.

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Держатели документа:
Балтийский государственный технический университет «Военмех» им. Д.Ф. Устинова
Институт физики им. Л.В. Киренского СО РАН
Сибирский федеральный университет

Доп.точки доступа:
Енютина, Т. А.; Enyutina T. A.; Терещенко, В. М.; Tereshchenko V. M.; Патрушева, Т. Н.; Patrusheva T. N.; Бондарев, Виталий Сергеевич; Bondarev, V. S.; Марченкова, С. Г.; Marchenkova S. G.
}
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Effect of oxygen nonstoichiometry on electrical conductivity and thermopower of Gd0.2Sr0.8FeO3-δ ferrite samples / V. Dudnikov [et al.] // Materials. - 2019. - Vol. 12, Is. 1. - Ст. 74, DOI 10.3390/ma12010074. - Cited References: 24 . - ISSN 1996-1944
Кл.слова (ненормированные):
Rare-earth-substituted cobalt oxides -- Stability -- Thermoelectric properties
Аннотация: The behavior of the resistivity and thermopower of the Gd0.2Sr0.8FeO3−δ ferrite samples with a perovskite structure and the sample stability in an inert gas atmosphere in the temperature range of 300–800 K have been examined. It has been established that, in the investigated temperature range, the thermoelectric properties in the heating‒cooling mode are stabilized at δ ≥ 0.21. It is shown that the temperature dependencies of the resistivity obtained at different δ values obey the activation law up to the temperatures corresponding to the intense oxygen removal from a sample. The semiconductor‒semiconductor electronic transitions accompanied by a decrease in the activation energy have been observed with increasing temperature. It is demonstrated that the maximum thermoelectric power factor of 0.1 µW/(cm·K2) corresponds to a temperature of T = 800 K.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center Krasnoyarsk Scientific Center, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk, 660036, Russian Federation
Institute of Engineering Physics and Radio Electronics, Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Institute of Chemistry and Chemical Technology, Federal Research Center Krasnoyarsk Scientific Center, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk, 660036, Russian Federation
Ioffe Institute, St. Petersburg, 194021, Russian Federation

Доп.точки доступа:
Dudnikov, V. A.; Дудников, Вячеслав Анатольевич; Orlov, Yu. S.; Орлов, Юрий Сергеевич; Fedorov, A. S.; Федоров, Александр Семенович; Solovyov, L.; Vereshchagin, S.; Burkov, A. T.; Novikov, S.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
}
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References regulating the BiMnxFe1-xO3 film conductivity upon cooling in magnetic and electric fields / S. S. Aplesnin [et al.] // Mater. Res. Express. - 2019. - Vol. 6, Is. 11. - Ст. 116125, DOI 10.1088/2053-1591/ab4ec7. - Cited References: 19. - This study was supported by the Russian Foundation for Basic Research project no. 18-52-00009 bel_a, No. 18-32-00079 mol_a. This work is part of the research program the state order No. 3.5743.2017/6.7. . - ISSN 2053-1591

РУБ Materials Science, Multidisciplinary
Рубрики:
DOMAINS
Кл.слова (ненормированные):
multiferroic -- curie temperature -- conductivity -- cooling in magnetic field
Аннотация: The magnetic and electrical properties of the BiFe1-xMnxO3 (x = 0.05, 0.15) films in the temperature range of 80–600 K have been investigated. The Curie temperature (Tc) of the films has been determined. A decrease in the conductivity of the films with x = 0.05 upon cooling in an electric field from the temperatures T ˂ Tc has been found. This effect has been described in the model of decreasing quantum well (domain wall) density and the tunneling coefficient drop. A decrease in the conductivity of the BiFe1-xMnxO3 film by more than an order of magnitude upon cooling from high temperatures in a magnetic field has been established. The experimental data are interpreted using the magnetic-field-induced magnetic structure variation and exchange splitting of the impurity subband.

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Держатели документа:
RAS, Kirensky Inst Phys, Fed Res Ctr KSC SB, Krasnoyarsk 660036, Russia.
Reshetnev Siberian State Univ Sci & Technol, Krasnoyarsk 660014, Russia.
Sci Pract Mat Res Ctr NAS, Minsk 220072, BELARUS.

Доп.точки доступа:
Aplesnin, S. S.; Аплеснин, Сергей Степанович; Masyugin, A. N.; Kretinin, V. V.; Yanushkevich, K. I.; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [18-52-00009 bel_a, 18-32-00079 mol_a, 3.5743.2017/6.7]
}
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    Moiseenko, E. T.
    In situ electron diffraction and resistivity characterization of solid state reaction process in Cu/Al bilayer thin films / E. T. Moiseenko, R. R. Altunin, S. M. Zharkov // Metall. Mat. Trans. A. - 2020. - Vol. 51, Is. 3. - P. 1428-1436, DOI 10.1007/s11661-019-05602-5. - Cited References: 52. - The authors wish to thank the financial support from the Russian Science Foundation (Grant #18-13-00080) . - ISSN 1073-5623
   Перевод заглавия: In situ исследования процесса твердофазной реакции в двухслойных тонких пленках Cu/Al методами дифракции электронов и изменения электросопротивления
Кл.слова (ненормированные):
Aluminum alloys -- Binary alloys -- Crystallites -- Electric conductivity -- Electron diffraction -- Intermetallics -- Solid state reactions -- Thin films
Аннотация: Solid state reaction processes in Cu/Al thin films have been studied using the methods of in situ electron diffraction and electrical resistivity measurements. The solid state reaction in the Cu/Al thin films has been found to begin already at 88 °C with the formation of the Al2Cu phase in the process of thermal heating in vacuum. The phase sequence at the solid state reaction in the films under study has been determined to be the following: Al2Cu → AlCu → Al4Cu9. A model has been suggested for describing the initial formation stage of intermetallic compounds at the solid state reaction in Cu/Al thin films. According to this model, at the initial stage, the intermetallic compounds are formed as separate crystallites at the interface in the Cu/Al thin films. The suggested model can be applied both to the formation of the first phase, Al2Cu, and to the subsequent phases: AlCu and Al4Cu9. For the Al4Cu9 phase the temperature coefficient of the electrical resistivity has been determined to be equal to αAl4Cu9= 1.1 × 10−3 K−1.

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Держатели документа:
Siberian Federal University, 79 Svobodny pr., Krasnoyarsk, 660041, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok 50/38, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Altunin, R. R.; Zharkov, S. M.; Жарков, Сергей Михайлович
}
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10.

Transport and magnetic phenomena in ZnO-С thin-film heterostructures / M. N. Volochaev, A. B. Granovsky, O. V. Zhilova [et al.] // Superlattices Microstruct. - 2020. - Vol. 140. - Ст. 106449, DOI 10.1016/j.spmi.2020.106449. - Cited References: 36. - The work was supported by the Ministry of Education and Science of Russia (project No. 3.1867.2017/4.6 ) and the RFBR (project No. 19-07-00471). The work was partially funded by the Academy of Finland . - ISSN 0749-6036
Кл.слова (ненормированные):
Zinc oxide -- Amorphous carbon -- Multi-layered structures -- Composites -- Hopping conductivity -- Weak localization -- Magnetoresistance
Аннотация: ZnO- and C-based heterostructures were fabricated by the layer-by-layer deposition technique using the ion-beam sputtering process. Structure, electrical and magnetic properties of fabricated heterostructures are discussed. The two-phase (ZnO and C) films are evolved into a multilayer structure, consisting of amorphous carbon and crystalline ZnO layers when the bilayer thickness increases. When carbon is added to ZnO, its electrical resistivity reduces. The conduction mechanism changes from the variable-range hopping in a narrow energy band to the nearest neighbors hopping in ZnO–C films with a thickness of h ˂ 150 nm. The temperature dependence of conductivity changes from the Arrhenius-like to logarithmic law, indicating that the strong charge localization turns into a weak one when the film thickness is about 150 nm. The negative magnetoresistance of up to 1% was detected at 77 K. The film ferromagnetism at the temperature of 10 K was not found.

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Держатели документа:
Kirensky Institute of Physics, Krasnoyarsk660036, Russian Federation
Lomonosov Moscow State University, Moscow119991, Russian Federation
Voronezh State Technical University, Voronezh394026, Russian Federation
National Research Centre ‘‘Kurchatov Institute”, Moscow123182, Russian Federation
Voronezh State University, Voronezh394003, Russian Federation
Lappeenranta-Lahti University of Technology, Lappeenranta FI53851, Finland

Доп.точки доступа:
Volochaev, M. N.; Волочаев, Михаил Николаевич; Granovsky, A. B.; Zhilova, O. V.; Kalinin, Y. E.; Ryl'kov, V. V.; Sumets, M. P.; Makagonov, V. A.; Pankov, S. Y.; Sitnikov, A. V.; Fadeev, E.; Lahderanta, E.; Foshin, V.
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