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Formation, characterization and magnetic properties of maghemite γ-Fe2O3 nanoparticles in borate glasses / I. S. Edelman [et al.] // J. Alloys Compd. - 2015. - Vol. 624. - P. 60-67, DOI 10.1016/j.jallcom.2014.11.059. - Cited References: 25. - This work was supported partly by the Russian Foundation for Basic Research - Russia, Grant No. 14-02-01211-a and by the President of Russia Grant No. NSh-2886.2014.2. This work was performed using the equipment of Unique Scientific Facility "Kurchatov Synchrotron Radiation Source'' supported by the Russian Ministry of Science and Education (project code RFMEFI61914X0002). . - ISSN 0925-8388

РУБ Chemistry, Physical + Materials Science, Multidisciplinary + Metallurgy & Metallurgical Engineering
Рубрики:
SUPERPARAMAGNETIC RESONANCE
   HYSTERESIS LOOPS
   EXCHANGE BIAS
   IONS
   MATRIX
Кл.слова (ненормированные):
Nanostructures -- Crystal structure and symmetry -- Magnetic measurements
Аннотация: A new type of nanocomposite materials based on maghemite, γ-Fe2O3, nanoparticles dispersed in borate glasses co-doped with low contents of iron together with the larger radius element combinations: Y and Bi, or Sm and Pb, or Y and Pb is studied. Nanoparticles arise as a result of heat treatment of the glasses which gives them properties characteristic of magnetically ordered substances. Transmission electron microscopy and XRD show that only one magnetic phase, namely γ-Fe2O3 nanoparticles, occurs in glasses subjected to the thermal treatment at 540 °C during 24 h independently on the doping element nature. At the same time doping element and their concentrations ratio in every combination affect the particles average size and glass magnetic properties, such as magnetization temperature dependences, Faraday rotation value and electron magnetic resonance spectrum characteristics.

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Держатели документа:
RAS, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660036, Russia
NRC Kurchatov Inst, Moscow 123182, Russia
RAS, Siberian Branch, Boreskov Inst Catalysis, Novosibirsk 630090, Russia
Novosibirsk State Univ, Novosibirsk 630090, Russia

Доп.точки доступа:
Edelman, I. S.; Эдельман, Ирина Самсоновна; Ivanova, O. S.; Иванова, Оксана Станиславовна; Petrakovskaja, E. A.; Петраковская, Элеонора Анатольевна; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Tarasov, I. A.; Тарасов, Иван Анатольевич; Zubavichus, Y. V.; Trofimova, N. N.; Zaikovskii, V. I.; Russian Foundation for Basic Research - Russia [14-02-01211-a]; President of Russia [NSh-2886.2014.2]; Russian Ministry of Science and Education [RFMEFI61914X0002]
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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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Aver'yanov, E. M.
Manifestations of the higher moments of the orientation distribution function of molecules in the spectral properties of an impurity nematic / E. M. Aver'yanov, V. G. Rumyantsev // J. Exp. Theor. Phys. - 2004. - Vol. 98, Is. 6. - P. 1146-1151, DOI 10.1134/1.1777627. - Cited References: 15 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
LIQUID-CRYSTAL
   SCATTERING
   PHASES
   MATRIX
   ORDER
   DYES
Кл.слова (ненормированные):
Absorption -- Band structure -- Impurities -- Molecular dynamics -- Polarization -- Spectrum analysis -- Distribution function -- Local field parameters -- Splitting -- Temperature dependence -- Nematic liquid crystals
Аннотация: The polarized electronic absorption spectra, orientation ordering, and the special local field features were studied for push-pull linear dye molecules with strong donor-acceptor electronic conjugation of terminal fragments in the matrix of a nematic liquid crystal. The temperature-induced inversion of the sign of the splitting of polarized impurity absorption bands was observed. This effect was shown to be caused by the statistical character of orientation ordering of impurity molecules and manifestation of the higher moments of the orientation distribution function. The dependence of local field parameters (Lorentz tensor components) of impurity molecules on their orientation ordering was established. This dependence was used to reproduce the temperature dependence of the orientation order parameter of the matrix. (C) 2004 MAIK "Nauka / Interperiodica".

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
Res Inst Organ Intermediates & Dyes, Dolgoprudnyi 141700, Moscow Oblast, Russia
ИФ СО РАН
Kirenskii Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Research Institute of Organic Intermediates and Dyes, Dolgoprudnyi, Moscow oblast, 141700, Russian Federation

Доп.точки доступа:
Rumyantsev, V. G.; Аверьянов, Евгений Михайлович
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Interfering resonances in a quantum billiard / E. . Persson [et al.] // Phys. Rev. E. - 1998. - Vol. 58, Is. 6. - P. 8001-8004, DOI 10.1103/PhysRevE.58.8001. - Cited References: 14 . - ISSN 1063-651X

РУБ Physics, Fluids & Plasmas + Physics, Mathematical
Рубрики:
MATRIX
POLES
Аннотация: We present a method for numerically obtaining the positions, widths, and wave functions of resonance states in a two-dimensional billiard connected to a waveguide. For a rectangular billiard, we study the dynamics of three resonance poles lying separated from the other ones. As a function of increasing coupling strength between the waveguide and the billiard two of the states become trapped while the width of the third one continues to increase for all coupling strengths. This behavior of the resonance poles is reflected in the time delay function, which can be studied experimentally. [S1063-651X(98)14112-0].

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Держатели документа:
Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany
Tech Univ Dresden, Inst Theoret Phys, D-01062 Dresden, Germany
Russian Acad Sci, Inst Phys, Krasnoyarsk 660036, Russia
Acad Sci Czech Republ, Inst Phys Nucl, Rez 25068, Czech Republic
ИФ СО РАН

Доп.точки доступа:
Persson, E.; Pichugin, K.; Rotter, I.; Seba, P.
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