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    Wyświetlanie 1-6 z 6
    Tytuł:
    Combustion Formation of Novel Nanomaterials: Synthesis and Cathodoluminescence of Silicon Carbide Nanowires
    Autorzy:
    Savchyn, V.
    Karbovnyk, I.
    Popov, A.
    Huczko, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807601.pdf
    Data publikacji:
    2009-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.46.Hk
    78.67.Bf
    81.07.Bc
    Opis:
    This paper presents the combustion synthesis and characterization of one-dimensional silicon carbide nanostructures (nanowires of 3C-SiC polytype with zincblend structure) by means of cathodoluminescence technique. Cathodoluminescence spectra of nano-SiC samples and, as a reference, of a commercially available SiC micropowder are compared. It is shown that the emission band at 1.97 eV which is slightly evidenced in the spectrum of the commercial SiC under 10 keV electron beam irradiation becomes the prevailing band in CL of the purified silicon carbide nanowires.
    Źródło:
    Acta Physica Polonica A; 2009, 116, S; S-142-S-145
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Use of Mechanical Alloying for Production of Aluminium Matrix Composites with Non-Agglomerated Nanodiamond Reinforcing Particles
    Autorzy:
    Popov, V.
    Prosviryakov, A.
    Sagalova, T.
    Többens, D.
    Kiryukhantsev-Korneev, Ph.
    Powiązania:
    https://bibliotekanauki.pl/articles/1375581.pdf
    Data publikacji:
    2014-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Ni
    81.20.Ev
    Opis:
    Agglomeration is the main problem that prevents large-scale implementation of nanodiamonds in the production of composites. Mechanical alloying was applied for crushing the agglomerates and to obtain uniform distribution of the primary nanodiamond particles in aluminium matrix composites. The commonly used X-ray diffraction method fails to detect non-agglomerated diamond nanoparticles 5 to 6 nm in size, if they are incorporated in a metal matrix. Synchrotron radiation was used for the identification of non-agglomerated nanodiamonds. Scanning electron microscopy and synchrotron investigation showed that mechanical alloying does not lead to transformation of the diamond structure into other allotropic forms of carbon and the nanodiamond reinforcing particles are uniformly distributed in the aluminium matrix.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 4; 1008-1011
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impedance Spectra of As-Grown and Heat Treated $Na_{0.5}Bi_{0.5}TiO_3$ Crystals
    Autorzy:
    Kruzina, T.
    Sidak, V.
    Trubitsyn, M.
    Popov, S.
    Tuluk, A.
    Suchanicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398237.pdf
    Data publikacji:
    2018-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    77.84.-s
    43.58.Bh
    72.80.Rj
    Opis:
    The complex impedance spectra Z*(ω) were studied for as-grown and annealed in air $Na_{0.5}Bi_{0.5}TiO_3$ single crystals. Experimental data showed that annealing significantly increased impedance and led to appearance of low frequency Z* relaxation. The detected relaxation processes were associated with charge transfer within the regions with initial and reduced after annealing concentration of oxygen vacancies.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 4; 816-818
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Defects of Non-Stoichiometry and Dynamic Stability of SnTe Crystal Lattice
    Autorzy:
    Rogacheva, E. I.
    Sinelnik, N. A.
    Nashchekina, O. N.
    Popov, V. P.
    Lobkovskaya, T. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1929741.pdf
    Data publikacji:
    1993-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.70.Bv
    65.70.+y
    Opis:
    The temperature dependencies of coefficient of linear expansion α in the range of 4.2-300 K were obtained for SnTe samples with various degrees of deviation from stoichiometry. For the sample of stoichiometric composition in the α vs. temperature curves the anomalies connected with ferroelectric phase transition were detected. It was found that within cubic phase existence region α isotherms have a minimum at 50.4 at.% Te. Maximum dynamic stability at indicated composition is believed to be associated with the formation of vacancy superstructure.
    Źródło:
    Acta Physica Polonica A; 1993, 84, 4; 733-736
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    X-ray Synchrotron Studies of Nanostructure Formation in High Temperature - Pressure Treated Silicon Implanted with Hydrogen
    Autorzy:
    Wieteska, K.
    Wierzchowski, W.
    Graeff, W.
    Misiuk, A.
    Barcz, A.
    Bryja, L.
    Popov, V. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035493.pdf
    Data publikacji:
    2002-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.55.-a
    61.46.+w
    Opis:
    The effects of various high temperature-pressure treatments in Czochralski grown silicon (Cz-Si) implanted with 130 keV hydrogen to the dose of 4times10$\text{}^{16}$ cm$\text{}^{-2}$ were investigated using synchrotron X-ray topographic methods and rocking curve measurements. The high temperature- pressure processes included 10 h annealing at 450°C, 650°C, and 725°C at argon pressure 12 kbar and 1 bar. The topographic investigations were performed with projection and section methods in back-reflection and transmission geometry. It was found that annealing resulted in significantly reduced strain induced by the implantation, which became undetectable with presently used very sensitive synchrotron arrangement. A significant difference between the Cz-Si:H samples annealed at high and atmospheric pressure was observed. In the first case a distinct topographic contrast attributed to the formation of comparatively larger inclusions was observed. This effect was different at different temperatures. The samples annealed at enhanced pressure were more uniform and often produced significant interference effects.
    Źródło:
    Acta Physica Polonica A; 2002, 102, 2; 239-244
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetoelastic Anomalies and Suppression of Jahn-Teller Distortions in La$\text{}_{1-x}$Sr$\text{}_{x}$MnO$\text{}_{3}$ by Pulsed Magnetic Fields
    Autorzy:
    Kadomtseva, A. M.
    Popov, Yu. F.
    Vorob'ev, G. P.
    Kamilov, K. I.
    Ivanov, V. Yu.
    Mukhin, A. A.
    Balbashov, A. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013240.pdf
    Data publikacji:
    2000-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Kz
    75.50.Pp
    Opis:
    Thermal expansion Δl/l(T) and magnetostriction λ$\text{}_{∥, ⊥ }$(H,T) in the pulsed magnetic fields H up to 250 kOe were studied in the single La$\text{}_{1-x}$Sr$\text{}_{x}$MnO$\text{}_{3}$ crystals (x=0.1, 0 .125, and 0.15) at temperatures T=10-320 K. Anomalies in the Δl/l (T) curves were observed near a charge (polaron) ordering (T$\text{}_{p}$) and structural transitions between orthorhombic Jahn-Teller distorted O' phase and high temperature orthorhombic (pseudocubic) O$\text{}^{*}$ one (T'$\text{}_{s}$). A noticeable increase in the field-induced magnetostriction λ$\text{}_{∥, ⊥ }$(H) was revealed in the O' phase at T$\text{}_{p}$
    Źródło:
    Acta Physica Polonica A; 2000, 97, 3; 599-602
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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