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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev D. A., Bulavchenko O. A., Dubrovskii A. A., Tsybulya S. V., Cherepanova S. V., Gerasimov E. Y., Shaikhutdinov K. A.
Заглавие : Features of the structure, microstructure, and magnetic properties of manganese-aluminum spinels obtained in various thermal treatment conditions
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2013. - Vol. 55, Is. 7. - P.1401-1406. - ISSN 1063-7834, DOI 10.1134/S1063783413070056
Примечания : Cited References: 18. - This study was supported by the Russian Foundation for Basic Research (project no. 12-03-90839-mol_rf_nr) and the Ministry of Education and Science of the Russian Federation (agreement no. 8429).
Предметные рубрики: A-SITE SPINELS
CATALYSTS
OXIDE
MN3O4
Аннотация: The structural, microstructural, and magnetic properties of aluminum-manganese oxide in the ratio Mn: Al = 1: 1 in the well-crystallized and nanoheterogeneous states have been investigated. This oxide is obtained under various thermal treatment conditions and at different partial pressures of oxygen. The composition and cation distribution of the manganese and aluminum ions in spinel sites are determined. It is shown that the studied compound is a ferrimagnet with the Curie point T (C) a parts per thousand 26 K.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Safronov A. P., Beketov I. V., Komogortsev S. V., Kurlyandskaya G. V., Medvedev A. I., Leiman D. V., Larranaga A., Bhagat S. M.
Заглавие : Spherical magnetic nanoparticles fabricated by laser target evaporation
Место публикации : AIP Adv.: American Institute of Physics, 2013. - Vol. 3, Is. 5. - Ст.052135. - P. - ISSN 2158-3226, DOI 10.1063/1.4808368
Примечания : Cited References: 47. - This work was supported by the RFBR 10-02-96015 and 12-02-31385 projects, UrFU 215, Spanish MEC MAT2011-27573-C04 grants, Universidad del Pais Vasco UPV/EHU under UFI11/53 action and Physics Department of the University of Maryland visiting grant. Selected measurements were performed at SGIker service of UPV-EHU. We thank O.M. Samatov, Dr. A.M. Murzakayev, Dr. I. Orue, and A.A. Svalova for special support.
Предметные рубрики: IRON-OXIDE NANOPOWDERS
CO2-LASER EVAPORATION
FE3O4 NANOPARTICLES
FINITE-SIZE
TEMPERATURE
FERROMAGNETS
FERROFLUIDS
DEPENDENCE
EXPLOSION
PARTICLES
Аннотация: Magnetic nanoparticles of iron oxide (MNPs) were prepared by the laser target evaporation technique (LTE). The main focus was on the fabrication of de-aggregated spherical maghemite MNPs with a narrow size distribution and enhanced effective magnetization. X-ray diffraction, transmission electron microscopy, magnetization and microwave absorption measurements were comparatively analyzed. The shape of the MNPs (mean diameter of 9 nm) was very close to being spherical. The lattice constant of the crystalline phase was substantially smaller than that of stoichiometric magnetite but larger than the lattice constant of maghemite. High value of M-s up to 300 K was established. The 300 K ferromagnetic resonance signal is a single line located at a field expected from spherical magnetic particles with negligible magnetic anisotropy. The maximum obtained concentration of water based ferrofluid was as high as 10g/l of magnetic material. In order to understand the temperature and field dependence of MNPs magnetization, we invoke the core-shell model. The nanoparticles is said to have a ferrimagnetic core (roughly 70 percent of the caliper size) while the shell consists of surface layers in which the spins are frozen having no long range magnetic order. The core-shell interactions were estimated in frame of random anisotropy model. The obtained assembly of de-aggregated nanoparticles is an example of magnetic nanofluid stable under ambient conditions even without an electrostatic stabilizer. (C) 2013 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Edelman I. S., Ivanova O. S., Ivantsov R. D., Velikanov D. A., Zabluda V. N., Zubavichus Y., Veligzhanin A. A., Zaikovskiy V. I., Stepanov S., Artemenko A., Curely J., Kliava J.
Заглавие : Magnetic nanoparticles formed in glasses co-doped with iron and larger radius elements
Место публикации : J. Appl. Phys.: American Institute of Physics, 2012. - Vol. 112, Is. 8. - Ст.84331. - P. - ISSN 0021-8979, DOI 10.1063/1.4759244
Примечания : Cited References: 65. - This work was partly supported by the Russian Foundation for Basic Research, Grant Nos. 07-02-92174 RFBR-CNRS and 11-02-00972, and President of Russia Federation Grant No NSh 1044.2012.2. A. Artemenko acknowledges financial support from the Marie Curie International Incoming Fellowship within the 7th European Community Framework Programme (EPREXINA, GA 255662). The synchrotron measurements were supported via the Russian federal Contract No. 16.552.11.7003. The authors thank K. P. Polyakova for the preparation of thin films.
Предметные рубрики: SUPERPARAMAGNETIC RESONANCE
FERROMAGNETIC-RESONANCE
TEMPERATURE-DEPENDENCE
FERRITE NANOPARTICLES
OXIDE NANOPARTICLES
FARADAY-ROTATION
CERAMICS
ANISOTROPY
PARTICLES
SPECTRA
Аннотация: A new type of nanoparticle-containing glasses based on borate glasses co-doped with low contents of iron and larger radius elements, Dy, Tb, Gd, Ho, Er, Y, and Bi, is studied. Heat treatment of these glasses results in formation of magnetic nanoparticles, radically changing their physical properties. Transmission electron microscopy and synchrotron radiation-based techniques: x-ray diffraction, extended x-ray absorption fine structure, x-ray absorption near-edge structure, and small-angle x-ray scattering, show a broad distribution of nanoparticle sizes with characteristics depending on the treatment regime; a crystalline structure of these nanoparticles is detected in heat treated samples. Magnetic circular dichroism (MCD) studies of samples subjected to heat treatment as well as of maghemite, magnetite, and iron garnet allow to unambiguously assign the nanoparticle structure to maghemite, independently of co-dopant nature and of heat treatment regime used. Different features observed in the MCD spectra are related to different electron transitions in Fe3+ ions gathered in the nanoparticles. The static magnetization in heat treated samples has non-linear dependence on the magnetizing field with hysteresis. Zero-field cooled magnetization curves show that at higher temperatures the nanoparticles occur in superparamagnetic state with blocking temperatures above 100 K. Below ca. 20 K, a considerable contribution to both zero field-cooled and field-cooled magnetizations occurs from diluted paramagnetic ions. Variable-temperature electron magnetic resonance (EMR) studies unambiguously show that in as-prepared glasses paramagnetic ions are in diluted state and confirm the formation of magnetic nanoparticles already at earlier stages of heat treatment. Computer simulations of the EMR spectra corroborate the broad distribution of nanoparticle sizes found by "direct" techniques as well as superparamagnetic nanoparticle behaviour demonstrated in the magnetization studies. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4759244]
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Вид документа : Статья из сборника (выпуск продолж. издания)
Шифр издания :
Автор(ы) : Edelman I. S., Ivanova O. S., Ivantsov R. D., Velikanov D. A., Petrakovskaja E. A., Artemenko A., Curely J., Kliava J., Zaikovskiy V. I., Stepanov S.
Заглавие : Magnetic properties and morphology of manganese ferrite nanoparticles in glasses
Коллективы : Baltic Conference on Silicate Materials
Место публикации : IOP Conf. Ser.: Mater. Sci. Eng. - 2011. - Vol. 25, Is. 1. - Ст.012017. - , DOI 10.1088/1757-899X/25/1/012017
Ключевые слова (''Своб.индексиров.''): average diameter--borate glass--co-doped--electron magnetic resonance--magnetic and magneto-optical properties--magnetic behaviour--magnetic circular dichroisms--magnetic nanoparticles--magnetically ordered material--manganese ferrite nanoparticles--manganese ferrites--morphological characteristic--paramagnetic ions--resonance field--size and shape--static magnetization--temperature dependence--temperature dependent--variable temperature--visible and near infrared--alumina--dichroism--ferrite--glass--iron oxides--magnetic properties--magnetic resonance--magnetocrystalline anisotropy--manganese--manganese oxide--nanoparticles--paramagnetism--silicates--spectroscopy--nanomagnetics
Аннотация: Static magnetization (SM), magnetic circular dichroism (MCD) and electron magnetic resonance (EMR) studies are reported of borate glasses 22.5 K 2O-22.5 Al 2O 3-55 B 2O 3 co-doped with iron and manganese oxides. In as-prepared glasses the paramagnetic ions usually are in diluted state; however, if the ratio of the iron and manganese oxides in the charge is 3/2, magnetic nanoparticles are found already in as-prepared glass. After additional thermal treatment all glasses show magnetic behaviour, MCD and EMR due to the presence of magnetic nanoparticles with characteristics close to those of manganese ferrite. By computer simulating the EMR spectra at variable temperatures, their morphological characteristics are deduced: relatively broad size and shape distribution with average diameter of ca. 3-4 nm. The characteristic temperature-dependent shift of the apparent resonance field is explained by a strong temperature dependence of the magnetocrystalline anisotropy in the nanoparticles. The potassium-alumina-borate glasses containing magnetic nanoparticles represent a novel class of materials: "transparent magnets". Indeed, they remain transparent in a part of visible and near infrared spectral range while showing magnetic and magneto-optical properties characteristic of magnetically ordered materials.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Volkov N. V., Rautskii M. V., Eremin E. V., Patrin G. S., Kim P. D., Lee C. G.
Заглавие : Response of a manganite-based magnetic tunnel structure to microwave radiation
Коллективы : Moscow International Symposium on Magnetism
Место публикации : Diffusion and Defect Data Pt.B: Solid State Phenomena. - 2012. - Vol. 190. - P.125-128. - ISBN 978, DOI 10.4028/www.scientific.net/SSP.190.125. - ISBN 9783037854365
Ключевые слова (''Своб.индексиров.''): magnetic tunnel structure--microwave detection effect--spintronics--current flowing--current-in-plane geometry--magnetic tunnels--magnetization dynamics--microwave detection--non-linearity--rectification effects--spin-polarized currents--voltage signals--magnetic materials--magnetoelectronics--manganese oxide--microwaves--magnetism
Аннотация: We demonstrate that a magnetic tunnel structure irradiated by microwaves can generate a significant voltage signal due to the rectification effect. The measurements were carried out using current-in-plane geometry with a current flowing parallel to the interfaces in the structure. A value of the microwave-induced voltage strongly depends on a bias current and can be driven by a magnetic field. The rectification effect is discussed both in "Classical" terms of nonlinearity of the current-voltage characteristic and using a mechanism that involves the interplay between the spinpolarized current and magnetization dynamics in the magnetic tunnel structure. В© (2012) Trans Tech Publications.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Тамбасов, Игорь Анатольевич, Немцев, Иван Васильевич, Савранский Д. С., Мацынин, Алексей Александрович, Ежикова Е. В.
Заглавие : Влияние фотонной обработки и температуры на проводимость In2O3 пленок, полученных автоволновым окислением
Место публикации : Вестник СибГАУ. - 2013. - № 3. - С. 103-106. - ISSN 1816-9724
Примечания : Работа выполнена частично при финансовой поддержке ФЦП «Исследования и разработки по приоритетным направлениям развития научно-технологичного комплекса России на 2007-2013 годы» (госконтракт № 14.513.11.0023), а также Министерства образования и науки Российской Федерации (договор № 02.G25.31.0043)
Ключевые слова (''Своб.индексиров.''): тонкие пленки--оксид индия--автоволновое окисление--ультрафиолетовое облучение--thin films--indium oxide--auto-wave oxidation--ultraviolet irradiation
Аннотация: Пленки оксида индия были синтезированы автоволновой реакцией окисления на покровном стекле, кварце и монокристалле MgO. Толщина пленки измерялась с помощью режима «cross-section» сканирующего электронного микроскопа и составляла ~300 нм. Оптическая ширина запрещенной зоны оксида индия была ~3.5 эВ. Исследования сопротивления In2O3 пленки от температуры в теневых условиях показали, что при нагревании до 100 0С сопротивление увеличивается на ~10 %. Показано, что при фотооблучении происходит резкое уменьшение электрического сопротивления пленок, максимальное изменение которого составило 52 % при комнатной температуре. Определены две скорости релаксации сопротивления пленок после прекращения облучения 15 Ом/сек первые 30 сек и 7 Ом/сек в остальное время. Сделано предположение, что фотовосстановление является доминирующим механизмом, ответственным за изменения проводимости пленок.Indium oxide films were synthesized by auto-wave oxidation reaction on the cover glass, quartz and single crystal MgO. The film thickness was measured with a mode «cross-section» scanning electron microscope and was ~ 300 nm. Optical band gap of indium oxide was ~3.5 eV. The study of In2O3 film resistance versus temperature in the dark conditions showed that when heated to 100 °C the resistance increases by about 10 %. It is shown that the_ films electric resistance decreases sharply under photo radiation and the maximum change was 52 % at room temperature. The two film resistance relaxation rates after irradiation have been determined to be 15 Ohm/s the first 30 seconds and 7 Оhm/s f for the rest, respectively. On the basis of the above stated the authors suggest that the photo reduction is the dominant mechanism responsible for the changes in conductivity of In 2O 3 films.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Tambasov I. A., Myagkov V. G., Ivanenko A. A., Bykova L. E., Yozhikova E. V., Maksimov I. A., Ivanov V. V.
Заглавие : Effect of exposure to optical radiation and temperature on the electrical and optical properties of In2O3 films produced by autowave oxidation
Коллективы : Ministry of Education and Science of the Russian Federation [14.513.11.0023]
Место публикации : Semiconductors: MAIK Nauka-Interperiodica / Springer, 2014. - Vol. 48, Is. 2. - P.207-211. - ISSN 1063-7826, DOI 10.1134/S1063782614020286. - ISSN 1090-6479
Примечания : Cited References: 42. - This study was supported by the Ministry of Education and Science of the Russian Federation, Federal Targeted Program "Research and Development in Priority Fields of Development of the Science and Technology Complex of Russia for 2007-2013", state contract no. 14.513.11.0023.
Предметные рубрики: GAS SENSOR RESPONSE
INDIUM OXIDE-FILMS
THIN-FILMS
HIGH-PERFORMANCE
TIN OXIDE
TRANSPARENT CONDUCTORS
SUBSTRATE-TEMPERATURE
ROOM-TEMPERATURE
TRANSISTORS
PHOTOREDUCTION
Аннотация: Indium-oxide films are synthesized by the autowave-oxidation reaction. It is shown that, upon exposure to optical radiation, the resistance of the films sharply decreases and the maximal relative change in the resistance is 52% at room temperature. Two resistance relaxation rates after termination of the irradiation, 15 Omega s(-1) during the first 30 s and 7 Omega s(-1) over the remaining time, are determined. The data of infrared spectroscopy of the films show that exposure to optical radiation induces a 2.4% decrease in the transmittance at a wavelength of 6.3 mu m. It is found that, after termination of the irradiation, the transmittance gradually increases with a rate of 0.006% s(-1). It is suggested that photoreduction is the dominant mechanism responsible for changes in the electrical and optical properties of the In2O3 films.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Patrusheva T. N., Aleksandrovsky A. S., Khval'ko A. A., Kolovskii Yu.V., Polyushkevich A. V., Khol'kin A. I.
Заглавие : Luminescent oxide materials obtained by the extraction pyrolytic method
Место публикации : Theor. Found. Chem. Eng.: MAIK Nauka-Interperiodica / Springer, 2012. - Vol. 46, Is. 4. - P.379-383. - ISSN 0040-5795, DOI 10.1134/S0040579512040069
Примечания : Cited References: 13. - The work was supported by the Russian Foundation for Basic Research project (no. 10-03-00188a).
Ключевые слова (''Своб.индексиров.''): extraction pyrolytic method--luminescent films--x-ray diffraction--luminescence spectra
Аннотация: Luminescent Y1.74Eu0.16Bi0.1O3 films have been obtained by extraction pyrolytic method. The formation of a crystalline structure in the film upon isothermal annealing in air at 600–650°C was established by X-ray diffraction. Single-phase Y1.74Eu0.16Bi0.1O3 films begin to exhibit luminescent properties after pyrolysis at 500°C; the intensity of luminescence increases with increasing temperature. The films annealed at 800°C consists of defect-free homogeneous crystallites with sizes of about 0.7 μm and demonstrats high luminescence intensity.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vasiliev A. D., Laptash N. M.
Заглавие : Polymorphism of KNaNbOF5 crystals
Место публикации : J. Struct. Chem.: Springer, 2012. - Vol. 53, Is. 5. - P.902-906. - ISSN 0022-4766, DOI 10.1134/S0022476612050101
Примечания : Cited References: 11. - The work was supported by RFBR (grant No. 09-02-00062).
Предметные рубрики: OXIDE FLUORIDE ANIONS
Ключевые слова (''Своб.индексиров.''): potassium-sodium oxopentafluoroniobate--crystal structure--o/f order--concomitant polymorphism
Аннотация: X-ray crystallography is used to analyze the concomitant polymorphism of KNaNbOF5 crystals. The second beta-modification of the compound, crystallizing in the tetragonal crystal system is found for the first time: space group P4/nmm, a = 5.9352(2) , c =8.5487(5) , V = 301.14(2) (3), Z = 2, R1 = 0.0095. Parameters of the orthorhombic noncentrosymmetric structure of the alpha-phase, previously described by Poeppelmeier et al. (J. Am. Chem. Soc., 129, 13963-13969 (2007)), are refined and a comparative analysis of both structures is performed. The structures are characterized by the complete ordering of oxygen and fluorine atoms, the Nb-O distance in the alpha-phase (1.738(1) ) being noticeably longer than that in the beta-phase (1.709(2) ). In beta-KNaNbOF5, alternating NbOF5 and NaOF5 octahedra share vertices, while in alpha-KNaNbOF5, they share both vertices and edges. The existence of the non-polar centrosymmetric beta-modification of KNaNbOF5 cancels the assumption of the substantial contribution of potassium cations to the polar structure of alpha-KNaNbOF5.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev D. A., Gokhfeld D. M., Popkov S. I., Shaikhutdinov K. A., Klinkova L. A., Zherikhina L. N., Tsvokhrebov A. M.
Заглавие : Increase in the magnetization loop width in the Ba0.6K0.4BiO3 superconductor: Possible manifestation of phase separation
Место публикации : J. Exp. Theor. Phys.: MAIK Nauka-Interperiodica / Springer, 2014. - Vol. 118, Is. 1. - P.104-110. - ISSN 1063-7761, DOI 10.1134/S1063776114010038. - ISSN 1090-6509
Примечания : Cited References: 39
Предметные рубрики: (K,BA)BIO3 SINGLE-CRYSTALS
II SUPERCONDUCTORS
BISMUTH-OXIDE
PEAK
DENSITY
TC
Аннотация: The magnetization of Ba0.6K0.4BiO3 samples in fields up to 90 kOe in the temperature range from 2 to 30 K is investigated. It is shown that the observed increase in the width of the magnetization loop can be explained by a decrease in the phase nonuniformity upon an increase in the magnetic field. The asymmetric hysteretic dependence of magnetization with the secondary peak was successfully described by the extended critical state model taking into account the phase separation in the superconductor.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Yakushkin S. S., Dubrovskiy A. A., Balaev A. D., Shaykhutdinov K. A., Bukhtiyarova G. A., Martyanov O. N.
Заглавие : Magnetic properties of few nanometers ɛ-Fe2O3 nanoparticles supported on the silica
Место публикации : J. Appl. Phys.: American Institute of Physics, 2012. - Vol. 111, Is. 4. - Ст.44312. - ISSN 0021-8979, DOI 10.1063/1.3686647
Примечания : Cited References: 27. - authors thank A. D. Balaev and N. V. Volkov for fruitful discussions and comments. This work was supported by Program of RAS No. 27.46.
Предметные рубрики: HIGH-TEMPERATURE
IRON
STABILIZATION
OXIDE
GEL
Аннотация: Magnetic properties of ɛ-Fe2O3nanoparticles supported on silica with the average size of few nanometers, narrow size distribution and no admixture of any other iron oxide polymorphs are investigated. The investigation of the temperature behavior of magnetization within the temperature range from 4.2 to 1000 K revealed the presence of several magnetic subsystems in the species under study. The temperatures’ behavior of the magnetic moment value indicates ferrimagnetic ordering in the ɛ-Fe2O3nanoparticles with a Curie temperature of about 800 K and points to the existence of a significant paramagnetic contribution becoming apparent at low temperatures. According to the electron spin resonance data, the particles possess superparamagnetic behavior at temperature higher ∼120 K. The model of the magnetic structure of monophase system of few nanometers ɛ-Fe2O3nanoparticles supported on silica is proposed.
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Myagkov V. G., Tambasov I. A., Bayukov O. A., Zhigalov V. S., Bykova L. E., Mikhlin Yu. L., Volochaev M. N., Bondarenko G. N.
Заглавие : Solid state synthesis and characterization of ferromagnetic nanocomposite Fe-In2O3 thin films
Место публикации : J. Alloys Compd.: Elsevier Science, 2014. - Vol. 612. - P.189-194. - ISSN 0925-8388, DOI 10.1016/j.jallcom.2014.05.176. - ISSN 1873-4669
Примечания : Cited References: 56
Предметные рубрики: HIGH-TEMPERATURE FERROMAGNETISM
PHASE-FORMATION
In2O
OXIDE
NANOPARTICLES
CO
SEMICONDUCTORS
NANOCRYSTALS
COMBUSTION
SYSTEMS
Ключевые слова (''Своб.индексиров.''): thermite reactions--reactive films--ferromagnetic nanocomposite films--transparent conducting oxides
Аннотация: We have successfully synthesized ferromagnetic Fe-In2O 3 nanocomposite thin films for the first time using the thermite reaction Fe2O3 + In = In2O3 + Fe. The initial In/Fe2O3 bilayers were obtained by the deposition of In layers on α-Fe2O3 films. The reaction occurs in a self-propagating mode in a homogeneous thermal film plane field at heating rates above 20 K/s and at temperatures above initiation temperature T[[d]]in[[/d]] ~ 180 °C. At heating rates lower than 20 K/s the mixing of the In and Fe2O3 layers occurs across the whole In/Fe2O3 interface and the synthesis of the ferromagnetic α-Fe phase starts above the initiation temperature T[[d]]in[[/d]] = 180 °C. X-ray diffraction, X-ray photoelectron spectroscopy, Mossbauer spectroscopy, transmission electron microscopy and magnetic measurements were used for phase identification and microstructure observation of the synthesized Fe-In2O3 samples. The reaction products contain (1 1 0) textured α-Fe nanocrystals with a diameter around 100 nm and surrounded by an In2O3 matrix. These results enable new efficient low-temperature methods for synthesizing ferromagnetic nanocomposite films containing ferromagnetic nanoclusters embedded in transparent conducting oxides. © 2014 Elsevier B.V. All rights reserved.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Tambasov I. A., Myagkov V. G., Tarasov A. S., Ivanenko A. A., Bykova L. E., Nemtsev I. V., Eremin E. V., Yozhikova E. V.
Заглавие : Reversible UV induced metal-semiconductor transition in In2O3 thin films prepared by autowave oxidation
Коллективы : Federal Target Program [14.513.11.0023]; Russian Foundation for Basic Research [14-02-31156]
Место публикации : Semicond. Sci. Technol.: IOP Publishing, 2014. - Vol. 29, Is. 8. - Ст.82001. - ISSN 0268-1242, DOI 10.1088/0268-1242/29/8/082001. - ISSN 1361-6641
Примечания : Cited References: 56. - This work was supported by the Federal Target Program through Contract No 14.513.11.0023; the Russian Foundation for Basic Research, Project No. 14-02-31156.
Предметные рубрики: TRANSPARENT CONDUCTING OXIDES
Ga-DOPED ZnO
LOW-TEMPERATURE
HIGH-PERFORMANCE
SUBSTRATE-TEMPERATURE
INSULATOR-TRANSITION
ROOM-TEMPERATURE
TRANSISTORS
COMBUSTION
PHOTOREDUCTION
Ключевые слова (''Своб.индексиров.''): indium oxide thin films--autowave oxidation--metal-semiconductor transition--uv irradiation--photoreduction
Аннотация: We have prepared thin indium oxide films by the autowave oxidation reaction. Measurements of temperature dependence of resistivity, Hall carrier concentration and Hall mobility have been conducted in the temperature range 5-272 K. Before ultraviolet (UV) irradiation, the indium oxide film had a semiconductor-like temperature dependence of resistivity. and the ratio of rho (5 K)/rho(272 K) was very limited (similar to 1.2). It was found that after UV irradiation of the In2O3 film, the metal-semiconductor transition (MST) was observed at similar to 100 K. To show that this MST is reversible and repeatable, two full cycles of 'absence of MST-presence of MST' have been done using UV irradiation (photoreduction) as the induced mechanism and exposure to an oxygen environment as the reversible mechanism, respectively. MST in transparent conducting oxide (TCO) is possibly associated with the undoped structure of metal oxide, which has some disorder of oxygen vacancies. It was suggested that reversible UV induced metal-semiconductor transition would occur in other TCOs.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Lin C.-R., Tseng Y.-T., Ovchinnikov S. G., Ivantsov R. D., Edelman I. S., Fedorov A. S., Kuzubov A. A., Fedorov D. A., Starchikov S. S., Lyubutin I. S.
Заглавие : Fe3S4 and Fe3O4 magnetic nanocrystals: magnetooptical and Mössbauer spectroscopy study
Место публикации : Mater. Research Express. - 2014. - Vol. 1, Is. 2. - P.025033. - DOI 10.1088/2053-1591/1/2/025033
Примечания : We thank the National Science Council of Taiwan (NSC 100-2923-M-153-001-MY3 and NSC 102-2112-M-153-002-MY3) for financial support. Support by the Russian Foundation for Basic Research (Grants #14-12-00848 and 14-02-0121) is acknowledged. This work was also supported by the Russian Federation President Grant NSh-2886.2014.2.
Ключевые слова (''Своб.индексиров.''): iron sulfide fe3s4--iron oxide fe3o4--magnetic nanoparticles--mössbauer spectroscopy--magnetic circular dichroism--ab-initio band structure--calculations
Аннотация: Iron oxide magnetite (Fe3O4) should be a reasonable analog for conception and understanding of the magnetic properties of iron sulfide greigite (Fe3S4)—one of the most required magnetic materials having numerous applications but being far from the complete understanding now. We present here a comparative study of the Mössbauer effect (ME) and the magnetic circular dichroism (MCD) spectroscopy of Fe3O4 and Fe3S4 nanoparticles. The ME spectrum parameters of Fe3S4 are shown to distinguish strongly from that of Fe3O4, and the MCD spectrum shapes are shown to be absolutely different for two compounds. To clarify the origin of the Fe3S4 MCD spectrum we have performed ab initio band structure calculations and identified the MCD spectrum features with the transitions between calculated energy states.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bykova L. E., Myagkov V. G., Tambasov I. A., Bayukov O. A., Zhigalov V. S., Mikhlin Y. L., Nemtsev I. V., Bondarenko G. N.
Заглавие : Magnetic and structural properties of nanocomposite ZnO-Fe3O4 films prepared by solid-state synthesis
Коллективы : Euro-Asian Symposium "Trends in MAGnetism": Nanomagnetism
Место публикации : Solid State Phenom.: Selected, peer reviewed papers/ ed.: S. G. Ovchinnikov, A. Samardak: Trans Tech Publications, 2014. - Vol. 215: Trends in Magnetism: Nanomagnetism (EASTMAG-2013). - P.158-162. - ISSN 978-303835054-5, DOI 10.4028/www.scientific.net/SSP.215.158. - ISSN 1662-9779
Примечания : Cited References: 18
Ключевые слова (''Своб.индексиров.''): ferromagnetic nanocomposite films--magnetite--solid-state synthesis--zinc oxide
Аннотация: A simple method for obtaining ZnO-FeO3O4 nanocomposites using solid-state reaction Zn + 3Fe2O3 ZnO + 2FeO3O4 is suggested. An analysis of the characteristics and properties of ZnOFeO3O4 nanocomposites was carried out by a combination of structural and physical methods (X-ray diffraction, scanning electron microscopy, photoelectron spectroscopy, Mossbauer measurements, X-ray fluorescent analysis, and magnetic measurements). The magnetization of the hybrid ZnOFeO3O4 films is equal to 440 emu/cm3. The resulting FeO3O4 nanoparticles are surrounded by a ZnO shell and have sizes ranging between 20 and 40 nm. © (2014) Trans Tech Publications, Switzerland.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pankrats A. I., Sablina K. A., Velikanov D. A., Bayukov O. A., Vorotynov A. M., Balaev A. D., Molokeev M. S., Kolkov M. I.
Заглавие : Magnetic and dielectric properties of PbFeBO4 and PbMnBO4 single crystals
Коллективы : Euro-Asian Symposium "Trends in MAGnetism": Nanomagnetism
Место публикации : Solid State Phenom.: Selected, peer reviewed papers/ ed.: S. G. Ovchinnikov, A. Samardak: Trans Tech Publications, 2014. - Vol. 215: Trends in Magnetism: Nanomagnetism (EASTMAG-2013). - P.372-377. - ISSN 978-303835054-5, DOI 10.4028/www.scientific.net/SSP.215.372. - ISSN 1662-9779
Примечания : Cited References: 3. - This investigation was supported by the Russian Foundation for Basic Research (RFBR) (Grant No.13-02-00897).
Ключевые слова (''Своб.индексиров.''): borate oxide--dielectric permittivity--magnetic susceptibility--single crystal--strong anisotropy
Аннотация: PbFeBO4 and PbMnBO4 single crystals were synthesized. The X-ray, magnetic, dielectric, Mossbauer, and resonance investigations of the crystals were fulfilled. It is established that single-crystal PbFeBO4 is an antiferromagnet with a Neel temperature TN =114 K, while PbMnBO4 is a ferromagnet with a Curie temperature TC = 31 K. Both single-crystal compounds have a strong anisotropy of the magnetic and dielectric properties. © (2014) Trans Tech Publications, Switzerland.
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17.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Edelman I. S., Ivanova O. S., Zubavichus Y., Trofimova N. N., Zaikovskiy V. I., Artemenko A., Curely J., Kliava J.
Заглавие : Magnetic nanoparticles in borate glasses: Identification and sizing
Коллективы : Russian Foundation for Basic Research, Russian Foundation for Basic Research, International Conference on Optimization of Electrical and Electronic Equipmen (22 May - 24 May 2014; Bran, Romania)
Место публикации : International Conference on Optimization of Electrical and Electronic Equipment (OPTIM 2014): IEEE Computer Society, 2014. - P.95-104. - ISBN 978-1-4799-5183-3, DOI 10.1109/OPTIM.2014.6850939
Примечания : Cited References: 60
Предметные рубрики: Engineering, Electrical and Electronic
Ключевые слова (''Своб.индексиров.''): superparamagnetic resonance--ferromagnetic-resonance--ferrite nanoparticles--oxide nanoparticles--faraday-rotation--ceramics--iron--crystallization--anisotropy--particles
Аннотация: Heat treatment of borate glasses co-doped with low contents of iron and larger radius elements: Dy, Tb, Gd, Ho, Er, Y and Bi results in formation of magnetic nanoparticles, radically changing their physical properties. Transmission electron microscopy and synchrotron radiation-based techniques: XRD, EXAFS, XANES and SAXS, show a broad distribution of nanoparticle sizes with characteristic depending on the treatment regime; a crystalline structure of these nanoparticles is detected in heat treated samples. Magnetic circular dichroism (MCD) studies of samples subjected to heat treatment as well as of maghemite, magnetite and iron garnet allow to unambiguously assigning the nanoparticle structure to maghemite. Different features observed in the MCD spectra are related to different electron transitions in Fe3+ ions gathered in the nanoparticles. Variable-temperature electron magnetic resonance (EMR) studies confirm the formation of magnetic nanoparticles and the identification of their nature. Computer simulations of the EMR spectra corroborate the broad distribution of nanoparticle sizes found by 'direct' techniques. © 2014 IEEE.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Voronkov M. G., Zel'bst E. A., Vasil'ev A. D., Molokeev M. S., Kuznetsova G. A.
Заглавие : Oxatrane is a parent compound of a new atrane family: Crystal and molecular structure of triethanolamine N-oxide
Коллективы : Council for Grants of the President of the Russian Federation for Support of Leading Scientific Schools [NSh-3649.2014.3]
Место публикации : Dokl. Chem.: Pleiades Publishing, 2014. - Vol. 458. - P.172-175. - ISSN 0012-5008, DOI 10.1134/S0012500814090031. - ISSN 1608-3113
Примечания : This work was supported by the Council for Grants of the President of the Russian Federation for Support of Leading Scientific Schools (grant no. NSh-3649.2014.3).
Предметные рубрики: TERTIARY-AMINES
DIETHANOLAMINE
SILATRANES
OXIDATION
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Petrov M. I., Balaev D. A., Ospishchev S. V., Shaikhutdinov K. A., Khrustalev B. P., Aleksandrov K. S.
Заглавие : Characteristics of current flow in composites made from a high-temperature superconductor and the low-temperature superconducting metal oxide Ba(PbBi)O-3
Место публикации : Phys. Solid State: American Institute of Physics, 1997. - Vol. 39, Is. 3. - P.362-368. - ISSN 1063-7834, DOI 10.1134/1.1130134
Примечания : Cited References: 21
Предметные рубрики: BAPB1-XBIXO3 SYSTEM
YBA2CU3O7-DELTA
Аннотация: Composites are prepared from a high-temperature superconductor with the 1-2-3 structure and the low-temperature oxide BaPb3/4Bi1/4O3 with various volume concentrations of the high-temperature and low-temperature superconductors. The temperature dependences of the electrical resistivities and critical current densities of the composites are measured. It is shown experimentally that these composites comprise a synthetically created network of Josephson weak links (with a specified degree of coupling). (C) 1997 American Institute of Physics.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrov K. S., Khrustalev B. P., Krivomazov S. N., Петров, Михаил Иванович, Vasilyev A. D., Zwegintsev S. A.
Заглавие : Superconductivity near liquid nitrogen temperature in the Sn-Ba-Sr-Y-Cu-O system
Место публикации : Physica C-Superconductivity and its Applications. - 1989. - Vol. 161, Is. 4. - P.493-496. - ISSN 0921-4534, DOI 10.1016/0921-4534(89)90087-7
Ключевые слова (''Своб.индексиров.''): ceramic materials--tin compounds--bulk superconductivity--high temperature superconductors--oxide superconductors--tin barium strontium yttrium copper oxide--superconducting materials
Аннотация: A high-Tc phase was found in the Sn-Ba-Sr-Y-Cu-O system. DC susceptibility data of Sn2Ba2Sr0.5Y0.5Cu3Ox show a single transition to bulk superconductivity with an onset temperature of 86 K. В© 1989.
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