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Formation and evolution of magnetic nanoparticles in borate glass simultaneously doped with Fe and Mn oxides / J. . Kliava [et al.] // J. Appl. Phys. - 2008. - Vol. 104, Is. 10. - Ст. 103917, DOI 10.1063/1.3021289. - Cited References: 37. - A financial support from the Russian Foundation for Basic Research (RFBR)-CNRS (Grant No. 07-02-92174) is highly appreciated. R. Ivantsov is grateful to the Russian Science Support Foundation. Y. Yeshurun acknowledges the support of the Israel Scienc Foundation (ISF). . - ISSN 0021-8979

РУБ Physics, Applied
Рубрики:
COBALT FERRITE PARTICLES
   SUPERPARAMAGNETIC RESONANCE
   GAMMA-FE2O3 NANOPARTICLES
   MATRIX
   SIZE
   SYSTEMS
Кл.слова (ненормированные):
aluminium compounds -- borate glasses -- coercive force -- Faraday effect -- heat treatment -- iron compounds -- magnetic hysteresis -- magnetic particles -- magnetic susceptibility -- manganese compounds -- Mossbauer effect -- nanoparticles -- paramagnetic materials -- potassium compounds -- remanence -- superparamagnetism -- transmission electron microscopy -- X-ray chemical analysis -- Atomic spectroscopy -- Auger electron spectroscopy -- Crystal structure -- Electric relays -- Electronic medical equipment -- Ferrite -- Ferrites -- Glass -- Heat treatment -- Hysteresis -- Hysteresis loops -- Magnetic properties -- Magnetic resonance measurement -- Magnetic susceptibility -- Magnetism -- Manganese -- Manganese compounds -- Molybdenum -- Nanoparticles -- Optical properties -- Ozone water treatment -- Polydispersity -- Superparamagnetism -- Borate glasses -- Concentration ratios -- Electron magnetic resonances -- Emr spectrums -- Experimental techniques -- Faraday rotations -- Glass compositions -- Glass matrixes -- Glass preparations -- Magnetic measurements -- Magnetic nano particles -- Magnetic orders -- Magnetically ordered systems -- Magneto-optical properties -- Manganese ferrites -- Mean diameters -- Mn oxides -- Phase states -- Polydisperse nanoparticles -- Remnant magnetizations -- Ssbauer spectroscopies -- Superparamagnetic -- Superparamagnetic states -- Thermal treatments -- Variable temperatures -- Magnetic materials
Аннотация: Evolution of the phase state of paramagnetic additions at various stages of synthesis and subsequent thermal treatment of glasses of the system Al(2)O(3)-K(2)O-B(2)O(3) simultaneously doped with Fe(2)O(3) and MnO is studied by means of a combination of experimental techniques: Faraday rotation (FR), electron magnetic resonance (EMR), transmission electron microscopy (TEM), Mossbauer spectroscopy, and magnetic measurements. Both FR and EMR show that magnetically ordered clusters occur already at the first stage of the glass preparation. In particular, for the ratio of the Fe and Mn oxides in the charge close to 3:2, fine magnetic nanoparticles are formed with characteristics similar to those of manganese ferrite. By computer simulating the EMR spectra at variable temperatures, a superparamagnetic nature of these nanoparticles is confirmed and their mean diameter is estimated as approximately 3.2 nm. In the thermally treated glasses larger magnetic nanoparticles are formed, giving rise to FR spectra, characteristic of magnetically ordered systems, and the EMR spectra different from those in as-prepared glasses but also showing superparamagnetic narrowing. The Mossbauer spectroscopy corroborates the manganese ferrite structure of the nanoparticles and indicates their coexistence in the ferrimagnetic and superparamagnetic states. The TEM shows the presence of polydisperse nanoparticles on the background of the glass matrix, and electron diffraction of a selected region containing larger particles indicates a crystal structure close to that of MnFe(2)O(4). Energy-dispersive atomic x-ray spectra confirm that the major part of Fe and Mn introduced to the glass composition is gathered in the particles, with the concentration ratio close to 2:1, characteristic of bulk MnFe(2)O(4). Magnetic hysteresis loops of samples subjected to an additional thermal treatment demonstrate a strong increase in the coercive force, remnant magnetization, and high-field magnetic susceptibility with temperature decrease. The consistent results obtained using various techniques demonstrate that the formation of nanoparticles with characteristics close to those of MnFe(2)O(4) confers to these glasses magnetic and magneto-optical properties typical of substances possessing magnetic order.

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Держатели документа:
[Kliava, J.] Univ Bordeaux 1, CNRS, UMR 5798, CPMOH, F-33405 Talence, France
[Edelman, I.
Ivanova, O.
Ivantsov, R.
Bayukov, O.
Petrakovskaja, E.
Stepanov, S.] RAS, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Zaikovskiy, V.] RAS, Siberian Branch, Boreskov Inst Catalysis, Novosibirsk 630090, Russia
[Bruckental, I.
Yeshurun, Y.] Bar Ilan Univ, Dept Phys, IL-52900 Ramat Gan, Israel
[Stepanov, S.] SI Vavilov State Opt Inst, St Petersburg 199034, Russia
ИФ СО РАН
CPMOH, Universit? Bordeaux, 1-CNRS UMR 5798, 33405 Talence Cedex, France
Kirensky Institute of Physics, Siberian Branch of RAS, 660036 Krasnoyarsk, Russian Federation
Boreskov Institute of Catalysis, Siberian Branch, RAS, 630090 Novosibirsk, Russian Federation
Department of Physics, Bar-Ilan University, Ramat-Gan 52900, Israel
S. I. Vavilov State Optical Institute, St. Petersburg 199034, Russian Federation

Доп.точки доступа:
Kliava, J.; Edelman, I. S.; Эдельман, Ирина Самсоновна; Ivanova, O. S.; Иванова, Оксана Станиславовна; Ivantsov, R. D.; Иванцов, Руслан Дмитриевич; Bayukov, O. A.; Баюков, Олег Артемьевич; Petrakovskaja, E. A.; Петраковская, Элеонора Анатольевна; Zaikovskiy, V.; Bruckental, I.; Yeshurun, Y.; Stepanov, S.
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Auger electron spectroscopy of thin Cr2GeC films / T. A. Andryushchenko, S. A. Lyaschenko, S. N. Varnakov [et al.] // Phys. Met. Metallogr. - 2023. - Vol. 124, Is. 14. - P. 1776-1782, DOI 10.1134/S0031918X2360135X. - Cited References: 33. - The research was supported by the Russian Science Foundation (grant no. 21-12-00226, http://rscf.ru/project/21-12-00226/) . - ISSN 0031-918X. - ISSN 1555-6190
Кл.слова (ненормированные):
МАХ phases -- chromium germanides -- epitaxial thin films -- Auger electron spectroscopy -- magnetron sputtering co-deposition
Аннотация: Auger electron spectroscopy was used to determine the phase composition of Cr2GeC MAX phase thin films. A distinctive feature of the formation of carbon-containing MAX phases is the shape of carbon Auger peaks, which is characteristic of metal carbides spectra. Features of the Auger spectra in the presence of secondary phases of chromium germanides are found. Their presence can manifest itself in an increase in the energy of the germanium peaks, which is caused by a chemical shift during the formation of the Cr–Ge bond. Moreover, we have detected the accumulation of electronic charge, which can be explained by the features of the surface morphology.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 660036, Krasnoyarsk, Russia

Доп.точки доступа:
Andryushchenko, T. A.; Андрющенко, Татьяна Александровна; Lyashchenko, S. A.; Лященко, Сергей Александрович; Varnakov, S. N.; Варнаков, Сергей Николаевич; Lukyanenko, A. V.; Лукьяненко, Анна Витальевна; Nemtsev, I. V.; Немцев, Иван Васильевич; Yakovlev, I. A.; Яковлев, Иван Александрович; Shevtsov, D. V.; Шевцов, Дмитрий Валентинович; Maximova, O. A.; Максимова, Ольга Александровна; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
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Auger electron spectroscopy of the air-exposed (Cr0.5Mn0.5)2GaC MAX film surface / T. A. Andryushchenko, S. A. Lyashchenko, A. V. Lukyanenko [et al.] // Tech. Phys. Lett. - 2023. - Vol. 49, Is. 7. - P. 59-64, DOI 10.61011/TPL.2023.07.56448.19430. - Cited References: 16. - This study was supported by a grant from the Russian Science Foundation, project № 21-12-00226 (http://rscf.ru/project/21-12-00226/) . - ISSN 1063-7850. - ISSN 1090-6533
Кл.слова (ненормированные):
MAX phases -- Auger electron spectroscopy -- epitaxial films -- ion etching
Аннотация: We have analyzed chemical bonding of atmospheric oxygen with chromium and manganese on the epitaxial MAX-phase (Cr0.5Mn0.5)2GaC surface using Auger electron spectroscopy combined with ion etching. It was found that the system has a specific anisotropic oxidation where oxygen atoms bind to chromium and manganese ones more actively at the faces of layered MAX phase crystallites in contrast to the (0001) basal plane. At the same time, the dominance of the Mn–O chemical bonding over Cr–O is observed on the latter.

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Публикация на русском языке Оже-электронная спектроскопия поверхности MAX-пленок (Cr0.5Mn0.5)2GaC, окисленной в результате хранения на воздухе [Текст] / Т. А. Андрющенко, С. А. Лященко, А. В. Лукьяненко [и др.] // Письма в ЖТФ. - 2023. - Т. 49 Вып. 14. - С. 22-27

Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB, Russian Academy of Sciences, Krasnoyarsk, Russia
Siberian State University, Krasnoyarsk, Russia

Доп.точки доступа:
Andryushchenko, T. A.; Андрющенко, Татьяна Александровна; Lyashchenko, S. A.; Лященко, Сергей Александрович; Lukyanenko, A. V.; Лукьяненко, Анна Витальевна; Varnakov, S. N.; Варнаков, Сергей Николаевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
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