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    Tytuł:
    Ion Beam Sputtering Monitored by Optical Spectroscopy
    Autorzy:
    El Fqih, M.
    Fournier, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1808025.pdf
    Data publikacji:
    2009-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.49.Sf
    79.20.Rf
    Opis:
    Optical spectroscopy gives a simple means to follow the evolution of the surface composition during ion beam sputtering. This is illustrated by three examples: air oxidised metals (Al and Cu), various CuAl alloys and the $Cu_{98}Be_2$ alloy. Several time scales are distinguished, corresponding to different processes: the elimination of surface contaminants, the removal of the corroded layer. The implications for the use of ion beam optical spectroscopy in surface analysis are discussed.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 5; 901-904
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Presence of Inductivity in $(CoFeZr)_x(PZT)_{1-x}$ Nanocomposite Produced by Ion Beam Sputtering
    Autorzy:
    Kołtunowicz, T.
    Żukowski, P.
    Boiko, O.
    Fedotov, A.
    Larkin, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402211.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:
    This paper presents the investigations of the electrical properties of the $(CoFeZr)_{x}(PZT)_{1-x}$ nanocomposite with the metallic phase content x=43.8 at.%, which was produced by ion beam sputtering. Such preparation took place under an argon atmosphere with low oxygen content with its partial pressure $P_{O_2} = 2 \times 10^{-3} Pa$. The measurements were performed using alternating current within the frequency range of 50 Hz-10⁵ Hz for measuring temperatures ranging from 238 K to 328 K. The $(CoFeZr)_{43.8}(PZT)_{56.2}$ nanocomposite sample subjected to a 15 min annealing process in air at the temperature Tₐ=423 K demonstrates a phase angle of -90° ≤ θ ≤ 0° in the frequency range 50 Hz-10⁵ Hz. It corresponds to the capacitive type of conduction. In the frequency range 10⁴-10⁵ Hz sharp minima in selected conductivity vs. frequency characteristics occur, which corresponds to a current resonance phenomenon in RLC circuits. In case of a sample annealed at Tₐ=498 K the inductive type of conduction with 0° ≤ θ ≤ +90° occurs in a high frequency area. At the frequency $f_{r}$ characterized by the phase angle θ = 0°, the capacity value reaches its local minimum. It indicates a voltage resonance phenomenon in conventional RLC circuits. The θ = +90° crossing in the frequency dependence of phase angle corresponds to the current resonance phenomenon, which is represented by a strong local minimum in the conductivity vs. frequency characteristics.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 5; 853-856
    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:
    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:
    Annealing of $(CoFeZr)_{x}(CaF_2)_{100-x}$ Nanocomposites Produced by the Ion-Beam Sputtering in the Ar and $O_2$ Ambient
    Autorzy:
    Kołtunowicz, T.
    Zhukowski, P.
    Bondariev, V.
    Fedotova, J.
    Fedotov, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400483.pdf
    Data publikacji:
    2013-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    62.23.Pq
    79.20.Rf
    81.40.Ef
    72.80.Le
    Opis:
    This paper presents the investigations of electrical properties and effect of annealing on conductivity of $(CoFeZr)_{x}(CaF_2)_{100-x}$ nanocomposites produced by ion-beam sputtering in the Ar and $O_2$ ambient. Investigations into conductivity of $(CoFeZr)_{x}(CaF_2)_{100-x}$ nanocomposites depending on the measuring temperature and the annealing temperature have been performed. The application of a combined argon-oxygen beam brings about lowering of the potential barrier on the surface of nanoparticles. In the course of annealing the additional oxidation occurs. First it proceeds on the surface and then all through the metallic-phase particles.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 5; 932-934
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pomiary właściwości elektrycznych nanokompozytów o strukturze stop metaliczny FeCoZr w matrycy dielektrycznej PbZrTiO3
    Measurements of electrical properties of nanocomposite containing metallic alloy FeCoZr in a PbZrTiO3 dielectric matrix
    Autorzy:
    Boiko, O.
    Kotunowicz, T.N.
    Powiązania:
    https://bibliotekanauki.pl/articles/408633.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
    Tematy:
    nanokompozyty
    rozpylanie jonowe
    układy RLC
    pomiary częstotliwościowe
    nanocomposites
    ion beam sputtering
    RLC circuits
    frequency measurements
    Opis:
    W pracy przedstawiono wyniki pomiarów zmiennoprądowych właściwości elektrycznych ziarnistych nanokompozytów o strukturze (FeCoZr)x(PZT)(100-x). Praca zawiera wstępną analizę parametrów elektrycznych (pojemność Cp, tangens kąta strat dielektrycznych tgδ, rezystancja Rp
    Here, the AC electrical properties measurements of (FeCoZr)x(PZT)(100-x) granular nanocomposites are studied. The work contains a preliminary analysis of the electrical parameters (capacitance Cp, loss coefficient tgδ, resistance Rp and phase angle θ) for nanocomposite samples with different metallic phase content x studied in the frequency range 50 Hz – 5 MHz and temperature range 15 K – 375 K. It was established that the AC phenomena are typical for the conventional RLC circuits
    Źródło:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2015, 3; 65-70
    2083-0157
    2391-6761
    Pojawia się w:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Features of Real Part of Admittance in the Nanocomposites $(Fe_{45}Co_{45}Zr_{10})_{x}(Al_2O_3)_{100 - x}$ Manufactured by the Ion-Beam Sputtering Technique with Ar Ions
    Autorzy:
    Kołtunowicz, T.
    Zhukowski, P.
    Fedotova, V.
    Saad, A.
    Larkin, A.
    Fedotov, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1503798.pdf
    Data publikacji:
    2011-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    79.20.Rf
    73.22.-f
    84.37.+q
    72.20.Ee
    Opis:
    The temperature and frequency dependences of the admittance real part σ (T, f) in granular $(Fe_{45}Co_{45}Zr_{10})_{x}(Al_2O_3)_{100 - x}$ nanocomposite films around the percolation threshold $x_{C}$ were investigated. The behaviour of σ (T, f) vs. the temperature and frequency over the ranges 77-300 K and 50 Hz-1 MHz, respectively, displays the predominance of an activation (hopping) conductance mechanism for the samples below the percolation threshold $x_{C}$ and of a metallic one beyond the $x_{C}$ determined as 54 ± 2 at.%. The mean hopping range d for the nanoparticles diameter D was estimated at different metallic phase content x.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 1; 35-38
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hopping Conductance in Nanocomposites $(Fe_{0.45}Co_{0.45}Zr_{0.10})_{x}(Al_2O_3)_{1 - x}$ Manufactured by Ion-Beam Sputtering of Complex Target in $Ar+O_2$ Ambient Gas
    Autorzy:
    Kołtunowicz, T.
    Zhukowski, P.
    Fedotova, V.
    Saad, A.
    Fedotov, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1503812.pdf
    Data publikacji:
    2011-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    79.20.Rf
    73.22.-f
    84.37.+q
    72.20.Ee
    Opis:
    We report the investigation of a real part of the admittance σ of granular nanocomposites $(Fe_{0.45}Co_{0.45}Zr_{0.10})_{x}(Al_2O_3)_{1 - x}$ with 0.30 < x < 0.70 in the dielectric (hopping) regime. An analysis of the σ(T, f, x) dependences in the as-deposited and annealed films over the temperature 77 K < T < 300 K and frequency 50 < f < $10^6$ Hz ranges displayed the predominance of an activation (hopping) conductance mechanism with dσ/ dT > 0 for the samples below the percolation threshold $x_{C}$ ≈ 0.76 ± 0.05. Based on the earlier models for hopping AC conductance, computer simulation of the frequency coefficient $α_{f}$ of hopping conductance depending on the probability of jump p, frequency f, and also on the shape of σ(f) curve was performed. The experimental and simulation results revealed a good agreement.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 1; 39-42
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Formation of Noncoil-Like Inductance in Nanocomposites $(Fe_{0.45}Co_{0.45}Zr_{0.10})_{x}(Al_2O_3)_{1-x}$ Manufactured by Ion-Beam Sputtering of Complex Targets in $Ar+O_2$ Atmosphere
    Autorzy:
    Zhukowski, P.
    Kołtunowicz, T.
    Węgierek, P.
    Fedotova, J.
    Fedotov, A.
    Larkin, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1503848.pdf
    Data publikacji:
    2011-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.55.Ln
    73.22.-f
    81.40.Ef
    84.37.+q
    72.20.Ee
    Opis:
    This paper investigates the inductive contribution to AC conductance in the granular nanocomposites $(Fe_{0.45}Co_{0.45}Zr_{0.10})_{x}(Al_2O_3)_{1-x}$. The initial nanocomposites studied were manufactured in $Ar+O_2$ atmosphere by ion-beam sputtering of the target containing $Fe_{0.45}Co_{0.45}Zr_{0.10}$ and alumina stripes and then subjected to the annealing procedure in air over the temperature range 373 K < $T_{a}$ < 873 K. These samples, before and after annealing, were studied using the temperature 77 K < $T_{p}$ < 300 K and frequency 50 Hz < f < 1 MHz dependences of a real part of the admittance σ(T, f). Analysis of the observed σ (f, $T_{p}$) dependences for x < 0.5 demonstrated that in the studied samples the equivalent circuits with the capacitive and noncoil-like inductive contributions can be accomplished. Just in this case, the capacitive properties of RLC circuit with the phase angle - 90° ≤ $\Theta_{L}$ < 0° are exhibited at low frequencies and the inductive properties with 0° ≤ $\Theta_{H}$ < 90° become apparent at high frequencies. A value of the critical frequency $f_{R}$, where $\Theta_{H}$ changes sign, depends on the metallic phase concentration x, measuring temperature $T_{p}$, and annealing temperature $T_{a}$.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 1; 43-45
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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