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    Wyświetlanie 1-12 z 12
    Tytuł:
    Dielectric Properties of $(CoFeZr)_x(PZT)_{100-x}$ Nanocomposites Produced with a Beam of Argon and Oxygen Ions
    Autorzy:
    Koltunowicz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1382101.pdf
    Data publikacji:
    2014-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    62.23.Pq
    79.20.Rf
    81.40.Ef
    72.80.Le
    Opis:
    In this paper it was established that nanocomposite $(FeCoZr)_x(PZT)_{100-x}$, with x=90.0 at.%, produced by ion sputtering with argon and oxygen beam remains under the percolation threshold. It is related to the compound structure of films and creation of coat consisting of metallic oxides on surface of metallic phase nanogranules, which prevents electric contact between nanoparticles. Verification of the Arrhenius dependences for capacity and conductivity demonstrates that dominant part of metallic phase nanogranules has metal oxide coatings. Only a small number of nanogranules (probably around a few percent) does not have oxide coating.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 6; 1412-1414
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    XRD Analysis of Synthetic Diamond Powders Irradiated with Electrons
    Autorzy:
    Shishonok, E.
    Luhin, V.
    Koltunowicz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402231.pdf
    Data publikacji:
    2015-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.-a
    61.43.Gt
    61.50.-f
    61.80.Fe
    Opis:
    Powders of synthetic diamond with low strength were sorted on sets with a different grain size. The synthetic diamond sets had various crushing strengths and morphology. They were irradiated with high energy electrons (6.5 MeV, D=2×10¹⁹ cm¯²) and analyzed using X-ray diffraction (Cu K_α) before and after irradiation. As established from nonlinearity of the a(Θ)=f{R(Θ)} dependences and observed extra splittings in X-ray diffraction patterns (in addition to α₁-α₂ doublets), crystal lattice of synthetic diamond from different sets was variously distorted. Irradiation led to decreasing distortions more significantly, the higher the initial strength of the set was. The made conclusions coincide well with our previous results on synthetic diamond powders which were irradiated under various softer conditions with direct measurements of synthetic diamond crushing strength without X-ray diffraction analysis. X-ray diffraction allows to presort synthetic diamond of critically low relative mechanical strength as well as evaluate resistance of diamond crystal lattice against heavy irradiation and other external impacts.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 5; 912-914
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Kinetics of the Change of $SnO_{x}$ Thin Films Conductivity during the Gas-Adsorptive Interaction
    Autorzy:
    Zarapin, V.
    Luhin, V.
    Zukowski, P.
    Koltunowicz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1366165.pdf
    Data publikacji:
    2014-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.43.Mn
    73.61.Jc
    Opis:
    The subjects of investigation are thin semiconductor $SnO_{x}$ films received by thermal oxidation. The influence of gas environments on electrical conductivity of films were investigated by a static way by measurement of kinetic and equilibrium isotherm of adsorption of trimethylamine, alcohol, hydrogen sulfide and ammonia. The communication between a type isotherm of adsorption, chemical nature of gas and temperature is shown.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 6; 1319-1322
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Percolation Phenomena in $Cu_{x}(SiO_{y})_{100-x}$ Nanocomposite Films Produced by Ion Beam-Sputtering
    Autorzy:
    Koltunowicz, T.
    Zukowski, P.
    Czarnacka, K.
    Svito, I.
    Fedotov, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402230.pdf
    Data publikacji:
    2015-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    84.37.+q
    72.80.Ga
    73.22.-f
    61.46.Df
    64.60.ah
    Opis:
    In this paper the results of examinations of nanocomposites $Cu_{x}(SiO_{y})_{100-x}$ produced by ion beam sputtering using argon ions were presented. The examinations were performed by the use of ac devices for measuring frequency in the range 50 Hz-1 MHz and temperatures from 81 K to 273 K. The measurements were performed for the samples directly after production. Based on temperature dependences of conductivity σ , which were determined at the frequency 100 Hz, the Arrhenius graphs were prepared. From these graphs conductivity activation energies ΔE were calculated. Dependences of conductivity and activation energy of electrons on the metallic phase content x at the frequency 100 Hz were determined. Analysis of the obtained dependences shows that conductivity is a parabolic function of the metallic phase content x in nanocomposites. Changes of activation energies of nanocomposites, in which metallic phase contents are in the ranges x < 12 at.% and x > 68 at.%, demonstrate negative values - metallic type of conductivity. In the range 12 at.% < x < 68 at.% activation energies have positive values - the dielectric type of conductivity. It was established that for the metallic phase content of about 68 at.% the real percolation threshold occurs, and the conduction changes from dielectric to metallic type.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 5; 908-911
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of HPLC for the Analysis of Secoisolariciresinol Diglucoside in Flaxseeds
    Autorzy:
    Feskova, A.
    Luhin, V.
    Leontiev, V.
    Sovastei, O.
    Koltunowicz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400438.pdf
    Data publikacji:
    2013-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.80.Bg
    82.80.Qx
    Opis:
    High-pressure liquid chromatography - electrospray ionization-mass spectrometry coupled with the PDA detector was used for the analysis of secoisolariciresinol diglucoside in flaxseeds. The research was carried out using the spectrometer "Waters" on the BDS HYPERSIL column $C_{18}$ 250 × 4.6 mm, with the diode-array PDA 996 and the mass-detectors Micromass ZQ 2000 with the electrospray ionization. As a mobile phase acetonitrile and water with 0.1% formic acid were used. The content of secoisolariciresinol diglucoside in the flaxseeds of 12 cultivar was determined.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 5; 834-836
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrochemically Deposited Cobalt Nanoarrays in $SiO_2//n-Si$ Templates Produced by Swift Heavy Ion-Induced Modification Technology
    Autorzy:
    Koltunowicz, T.
    Zhukowski, P.
    Fedotova, J.
    Bayev, V.
    Streltsov, E.
    Baran, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400482.pdf
    Data publikacji:
    2013-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.Pq
    78.67.Rb
    61.46.Km
    75.30.Gw
    Opis:
    Nanoarrays of Co nanorods were formed by means of electrochemical deposition in the nanoporous $SiO_2//n-Si$ templates. Structure and magnetic properties at room temperatures were studied by means of atomic force and scanning electron microscopies, vibrating sample magnetometry. The presence of perpendicular magnetic anisotropy component at room temperature makes Co nanorods in the nanoporous $SiO_2//n-Si$ templates promising for nanoelectronic devices and biomedical applications.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 5; 929-931
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Low-Temperature DC Carrier Transport in $(Co_{0.45}Fe_{0.45}Zr_{0.10})_{x}(Al_2O_3)_{1-x}$ Nanocomposites Sputtered in Mixed Argon-Oxygen Atmosphere
    Autorzy:
    Svito, I.
    Fedotov, A.
    Saad, A.
    Koltunowicz, T.
    Zukowski, P.
    Bury, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1366313.pdf
    Data publikacji:
    2014-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.22.-f
    72.20.Ee
    64.60.ah
    Opis:
    This paper studies the temperature dependences (2 < T < 300 K) of the DC conductivity σ(T) for the $(Co_{0.45}Fe_{0.45}Zr_{0.10})_x(Al_2O_3)_{1-x}$ nanocomposites (30 < x < 65 at.%) sputtered in Ar + $O_2$ atmosphere. It is shown that at temperatures lower than 100-150 K dependences of DC conductance on temperature for all the studied samples are due to the Shklovski-Efros variable range hopping mechanism. It was also observed that σ(x,T) dependences can be attributed to the formation of FeCo-based oxide "shells" around metallic alloy nanoparticles due to incorporation of oxygen in the vacuum chamber during the deposition procedure.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 6; 1351-1354
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Admittance and Permittivity in Doped Layered $TlGaSe_2$ Single Crystals
    Autorzy:
    Dawood, S.
    Fedotov, A.
    Mammadov, T.
    Zukowski, P.
    Koltunowicz, T.
    Saad, A.
    Drozdov, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1365735.pdf
    Data publikacji:
    2014-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.61.Ey
    84.37.+q
    64.70.Nd
    Opis:
    In doped $TlGaSe_2$ crystals the phase transitions at low temperatures (100-170 K) were observed using admittance and dielectric spectroscopy in a temperature range of 80-320 K. The admittance and permittivity measurements in the studied samples indicated that after Fe or Tb doping by impurities with concentrations $N_\text{imp}$ < 0.5 at.% nonequilibrium electronic phase transition is observed. Doping with $N_\text{imp}$ > 0.5 at.% resulted in full suppression of this phase transition presence.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 6; 1267-1270
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanisms of Carrier Transport in $Cu_x(SiO_2)_{1-x}$ Nanocomposites Manufactured by Ion-Beam Sputtering with Ar Ions
    Autorzy:
    Fedotov, A.
    Mazanik, A.
    Svito, I.
    Saad, A.
    Fedotova, V.
    Czarnacka, K.
    Koltunowicz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402220.pdf
    Data publikacji:
    2015-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    84.37.+q
    72.80.Ga
    73.22.-f
    61.46.Df
    64.60.ah
    Opis:
    The present paper investigates the temperature/frequency dependences of admittance Z in the granular $Cu_x(SiO_2)_{1-x}$ nanocomposite films around the percolation threshold $x_{C}$ in the temperature range of 4-300 K and frequencies of 20-10⁶ Hz. The behavior of low-frequency ReZ(T) dependences displayed the predominance of electrons hopping between the closest Cu-based nanoparticles for the samples below the percolation threshold $x_{C}$ ≈ 0.59 and nearly metallic behaviour beyond the $x_{C}$. The high-frequency curves ReZ(f) at temperatures T > 10 K for the samples with x < $x_{C}$ exhibited behavior close to ReZ(f) ≈ $f^{-s}$ with s ≈ 1.0 which is very similar to the known Mott law for electron hopping mechanism. For the samples beyond the percolation threshold (x > $x_{C}$), the frequency dependences of ReZ(f) displayed inductive-like (not capacitive) behaviour with positive values of the phase shift angles.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 5; 883-886
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Voltage and Current Resonance in Nanocomposite $(FeCoZr)_x(CaF_2)_{100-x}$ Produced by Ion-Beam Sputtering in Pure Argon Atmosphere
    Autorzy:
    Koltunowicz, T.
    Zukowski, P.
    Bondariev, V.
    Fedotov, A.
    Svito, I.
    Fedotova, J.
    Saad, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402224.pdf
    Data publikacji:
    2015-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    62.23.Pq
    79.20.Rf
    81.40.Ef
    72.80.Le
    Opis:
    In this paper the results of investigations of electrical properties of metal-dielectric nanocomposites $(FeCoZr)_x(CaF_2)_{100-x}$ are presented. The samples with the metallic phase content x=45.7 at.% were produced by ion-beam sputtering method in pure argon atmosphere, and subsequently annealed at 398 K for 15 min. The measurements of electrical properties were performed in the frequency range from 50 Hz to 1 MHz. The frequency dependences of phase angle θ, capacity $C_{p}$, conductivity σ and dielectric loss factor tanδ were measured at seven different temperatures ranging from 148 K to 263 K. It was found that the nanocomposite exhibits the phenomena of voltage resonance and current resonance, characteristic of the conventional RLC circuits with series and parallel connections of elements.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 5; 897-900
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ion-Induced Modification of Structure and Magnetic Anisotropy in Granular FeCoZr-CaF₂ Nanocomposite Films
    Autorzy:
    Kasiuk, J.
    Fedotova, J.
    Przewoznik, J.
    Kapusta, Cz.
    Skuratov, V.
    Milosavljevic, M.
    Bondariev, V.
    Koltunowicz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402191.pdf
    Data publikacji:
    2015-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Tt
    75.30.Gw
    81.15.Jj
    81.40.Wx
    81.40.Rs
    61.80.Jh
    Opis:
    The paper reports on the results of structural analysis and magnetometry of granular nanocomposite films FeCoZr-CaF₂ irradiated with Xe and Kr ions at different fluences. The observed effect of enhanced perpendicular magnetic anisotropy characterizing pristine films is discussed with respect to the irradiation regimes and structural changes of the films originating from the impact of ions.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 5; 828-831
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermoelectric Properties of $Ca_3Co_4O_9$-Based Ceramics Doped with Fe and/or Y
    Autorzy:
    Fedotov, A.
    Mazanik, A.
    Svito, I.
    Saad, A.
    Troyanchuk, I.
    Bushinski, M.
    Fedotova, V.
    Zukowski, P.
    Koltunowicz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1366301.pdf
    Data publikacji:
    2014-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    46.25.Hf
    62.20.D-
    82.45.Xy
    Opis:
    We describe here structure and temperature dependences of conductivity σ(T), the Seebeck coefficient α(T), thermal conductivity λ(T) and figure-of-merit ZT(T) in $Ca_3Co_4O_9$ ceramics, doped with Fe and Y, depending on compacting pressure (0.2 or 6 MPa) and temperature (300 < T < 700 K). It is shown that introduction of iron and yttrium to ceramics does not alter the crystalline structure of the material. Increasing the pressure in the compacting process before the additional diffusion annealing leads to a smaller-grained structure and increase σ and λ due to reducing of the synthesized samples porosity. The Seebeck coefficients of nanocomposite ceramics $Ca_3Co_{3.9}Fe_{0.1}O_9$ and $(Ca_{2.9}Y_{0.1})(Co_{3.9}Fe_{0.1})O_9$ have linear dependences on temperature is not changed after increase of compacting pressure. Electrical-to-heat conductivity ratio (σ/λ) for the samples compacted at high (6 GPa) pressure increases not more than 20-30% in comparison with ones compacted at low (0.2 GPa) pressure, whereby ZT is increased more than 50%. The main reason for this effect is samples porosity reduction with the compacting pressure increase.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 6; 1344-1347
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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