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Spherical magnetic nanoparticles fabricated by laser target evaporation / A. P. Safronov [et al.] // AIP Adv. - 2013. - Vol. 3, Is. 5. - Ст. 052135. - P. , DOI 10.1063/1.4808368. - 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. . - ISSN 2158-3226

РУБ Nanoscience & Nanotechnology + Materials Science, Multidisciplinary + Physics, Applied
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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Держатели документа:
RAS, Inst Electrophys, Ekaterinburg 620016, Russia
Urals Fed Univ, Ekaterinburg 620000, Russia
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Univ Basque Country UPV EHU, Dept Elect & Elect, Bilbao 48080, Spain
Univ Basque Country UPV EHU, SGIker, Bilbao 48080, Spain
Univ Maryland, Dept Phys, FMR Grp, College Pk, MD 20742 USA

Доп.точки доступа:
Safronov, A. P.; Beketov, I. V.; Komogortsev, S. V.; Комогорцев, Сергей Викторович; Kurlyandskaya, G. V.; Medvedev, A. I.; Leiman, D. V.; Larranaga, A.; Bhagat, S. M.
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Formation of phases and microstructure of ZnO and TiO2 based ceramic / G. M. Zeer [et al.] // Glass Ceram. - 2015. - Vol. 72, Is. 7-8. - P. 242-245, DOI 10.1007/s10717-015-9765-8. - Cited References:15. - This work was supported in part by the Russian Foundation for Fundamental Research (Grant No. 13-08-01003-a) and the Ministry of Education of the Russian Federation (as part of scientific research tasked by the state to the Siberian Federal University for 2014). . - ISSN 0361-7610. - ISSN 1573-8515

РУБ Materials Science, Ceramics
Рубрики:
GLASS ENAMEL COATINGS
NANOWIRES
Кл.слова (ненормированные):
electrocontact materials -- metal oxides -- zinc titanate -- nanopowders -- ceramic -- microstructure -- phase formation
Аннотация: Nanopowders of zinc and titanium oxides were used to obtain samples of Zn2TiO4-ZnO ceramic. Phase formation as well as the microstructure and elemental composition of the phases formed were studied by means of electron microscopy. The density and porosity were calculated, and the sizes of grains and pores in the ceramic were determined. The temperature at the zinc titanate forms was determined. It was shown that it corresponds to the sintering temperature of electrocontact materials with this composition. It is proposed that zinc titanate and oxide be used as arc-suppressing and dispersion-hardening additional additives in copper-based electrocontact materials.

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Публикация на русском языке Формирование фаз и микроструктуры керамики на основе ZnO и TiO2 [Текст] / Г. М. Зеер [и др.] // Стекло и керамика. - 2015. - № 7. - С. 16-19

Держатели документа:
Siberian Fed Univ, Krasnoyarsk, Russia.
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk, Russia.
MF Reshetnev Siberian State Aerosp Univ, Krasnoyarsk, Russia.

Доп.точки доступа:
Zeer, G. M.; Zelenkova, E. G.; Nikolaeva, N. S.; Zharkov, S. M.; Жарков, Сергей Михайлович; Pochekutov, S. I.; Ledyaeva, O. N.; Sartpaeva, A. B.; Mikheev, A. A.; Russian Foundation for Fundamental Research [13-08-01003-a]; Ministry of Education of the Russian Federation
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Hydrogenation of the Nanopowders That Form in a Carbon-Helium Plasma Stream during the Introduction of Ni and Mg / G. N. Churilov [et al.] // J. Exp. Theor. Phys. - 2011. - Vol. 113, Is. 6. - P. 1057-1062, DOI 10.1134/S1063776111140135. - Cited References: 9. - This work was supported by the Russian Foundation for Basic Research, project no. 09-03-00383-a. . - ISSN 1063-7761

РУБ Physics, Multidisciplinary

Кл.слова (ненормированные):
Carbon atoms -- Composite nanoparticles -- High temperature -- Hydrogen absorption -- Hydrogen atoms -- Island growth -- Magnesium hydride -- Magnesium surface -- Nano powders -- Nickel atoms -- Plasma streams -- Atoms -- Carbon -- Composite materials -- Density functional theory -- Electron beams -- Helium -- Hydrogen -- Hydrogenation -- Nanoparticles -- Nickel -- Scanning electron microscopy -- Thermogravimetric analysis -- X ray photoelectron spectroscopy -- Magnesium
Аннотация: Composite nanoparticles consisting of magnesium, nickel, and carbon atoms are studied both theoretically and experimentally. The calculations performed in terms of the density functional theory show that the jump frequency of hydrogen atoms in nickel-containing magnesium hydride increases substantially near impurity nickel atoms; as a result, the rate of hydrogen absorption by magnesium also increases. Nickel on the magnesium surface is shown to be absorbed via an island growth mechanism. Composite Mg-C, Ni-C, and Mg-Ni-C powders are produced by plasmachemical synthesis in a carbon-helium plasma stream. Hydrogen is introduced into a chamber during synthesis. It is found by X-ray photoelectron spectroscopy and thermogravimetric analysis that, among these three composites, only Mg-Ni-C contains magnesium fixed in the MgH2 compound. The process of such "ultrarapid" hydrogenation of magnesium, which occurs in the time of formation of composite nanoparticles, can be explained by the catalytic action of nickel, which is enhanced by a high temperature. Scanning electron microscopy micrographs demonstrate the dynamics of the dehydrogenation of Mg-Ni-C composite nanoparticles in heating by an electron beam.

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Держатели документа:
[Churilov, G. N.
Osipova, I. V.
Glushchenko, G. A.
Fedorov, A. S.
Popov, Z. I.
Cherepakhin, A. V.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Tomashevich, Ye. V.
Vereshchagin, S. N.
Zhizhaev, A. M.] Russian Acad Sci, Siberian Branch, Inst Chem & Chem Technol, Krasnoyarsk 660049, Russia
[Bulina, N. V.] Russian Acad Sci, Siberian Branch, Inst Solid State Chem & Mechanochem, Novosibirsk 630128, Russia
ИФ СО РАН
ИХХТ СО РАН
Kirensky Institute of Physics, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk, 660036, Russian Federation
Institute of Chemistry and Chemical Technology, Siberian Branch, Russian Academy of Sciences, ul. K. Marksa 42, Krasnoyarsk, 660049, Russian Federation
Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch, Russian Academy of Sciences, ul. Kutateladze 18, Novosibirsk, 630128, Russian Federation

Доп.точки доступа:
Churilov, G. N.; Чурилов, Григорий Николаевич; Osipova, I. V.; Осипова, Ирина Владимировна; Tomashevich, Y. V.; Томашевич, Евгений Владимирович; Glushchenko, G. A.; Глущенко, Гарий Анатольевич; Fedorov, A. S.; Федоров, Александр Семенович; Popov, Z. I.; Попов, Захар Иванович; Bulina, N. V.; Булина, Наталья Васильевна; Vereshchagin, S. N.; Zhizhaev, A. M.; Cherepakhin, A. V.; Черепахин, Александр Владимирович
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    Particular charactristics of the synthesis of titanium nitride nanopowders in the plasma of low pressure arc discharge / A. V. Ushakov [et al.] // IOP Conf. Ser.: Mater. Sci. Eng. - 2017. - Vol. 255, Is. 1. - Ст. 012006, DOI 10.1088/1757-899X/255/1/012006. - Cited References: 26
   Перевод заглавия: Особенности синтеза нанопорошков нитрида титана в дуговом разряде плазмы низкого давления
Аннотация: The method of producing TiN nanopowders in the plasma of low pressure arc discharge in nitrogen atmosphere is discussed. The influence of gas pressure on nanopowder dispersion is studied. It is shown that the particles have nanometer size and a narrow particle size distribution.

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Доп.точки доступа:
Ushakov, A. V.; Karpov, I. V.; Lepeshev, A. A.; Лепешев, Анатолий Александрович; Fedorov, L. Y.; Dorozhkina, E. A.; Karpova, O. N.; Shaikhadinov, A. A.; Demin, V. G.; Bachurina, E. P.; Lichargin, D. V.; Abkaryan, A. K.; Zeer, G. M.; Зеер Г.М.; Zharkov, S. M.; Жарков, Сергей Михайлович; International Scientific Conference Reshetnev Readings(20 ; 2016 ; Nov. 9-12 ; Krasnoyarsk)
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    Microstructure and phase composition of the two-phase ceramic synthesized from titanium oxide and zinc oxide / G. M. Zeer [et al.] // Sci. Sinter. - 2018. - Vol. 50, Is. 2. - P. 173-181, DOI 10.2298/SOS1802173Z. - Cited References: 22 . - ISSN 0350-820X
   Перевод заглавия: Микроструктура и фазовый состав двухфазной керамики, синтезированной из оксидов титана и цинка
Кл.слова (ненормированные):
Nanopowders -- Titanium oxide -- Zinc oxide -- Solid phase reaction -- Ceramic
Аннотация: We have made investigations of the phase formation and microstructure on the ceramics obtained from a starting nanopowder mixture with the weight ratio ZnO : TiO2 = 4 : 1. Ceramic is obtained at different sintering temperatures, namely, 948, 1223 and 1473 К. Using the characterization methods of electron microscopy, energy dispersive microanalysis and X-ray diffraction phase analysis it has been shown that the ceramics structure is consisted of two dispersed phases of Zn2TiO4 and ZnO with the grain sizes being in range 0,5-1 μm. It has been found also that, at ceramic`s sintering temperature of 1223 К, the solid phase interactions are completed with the structure ZnO : Zn2TiO4 ≈ 1 : 1,5 phase ratio.

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Держатели документа:
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Siberian State Aerospace University, Krasnoyarsk, 660014, Russian Federation

Доп.точки доступа:
Zeer, G. M.; Zelenkova, E. G.; Nikolaeva, N. S.; Zharkov, S. M.; Жарков, Сергей Михайлович; Abkaryan, A. K.; Mikheev, A. A.
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