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    Wyświetlanie 1-7 z 7
    Tytuł:
    Deposition and Characterization of CdS, CuS and ZnS Thin Films Deposited by SILAR Method
    Autorzy:
    Guzeldir, B.
    Saglam, M.
    Ates, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1490738.pdf
    Data publikacji:
    2012-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.-a
    61.05.cp
    61.72.uj
    Opis:
    Cadmium sulfide, copper sulfide and zinc sulfide films were grown on Si(111) substrate by successive ionic layer adsorption and reaction method at room temperature. The crystalline structure and morphology of obtained films were characterized by X-ray diffraction, scanning electronic microscope and energy dispersive X-ray analysis methods. The films were polycrystalline and showed preferred orientation. The surface morphology of these films looked relatively smooth and homogeneous in the scanning electron microscope image. The energy dispersive X-ray analysis spectra showed that the expected elements exist in the thin films.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 1; 33-35
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characteristics of Ba-Doped PbS Thin Films Prepared by the SILAR Method
    Autorzy:
    Gülen, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/1205230.pdf
    Data publikacji:
    2014-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.-a
    61.05.cp
    68.55.Ln
    Opis:
    In this material production research, undoped and Ba-doped nanostructured PbS films are fabricated on glass surfaces by SILAR method. The structural, optical and morphological properties of the films are examined via scanning electron microscopy, UV-vis spectrophotometry and X-ray diffraction analysis. Scanning electron microscopy analysis revealed that Ba-doping concentration influences the size of the thin film's nanoparticles. X-ray diffraction results showed that all of the thin films are in a face centered cubic structure. Optical studies, in the room temperature, revealed that the optical band gap of the films increases as Ba-doping concentration is increased. The intercept values on the energy axis in the range of 1.86 eV and 2.12 eV for 1% and 8% Ba-doped PbS films respectively. As a result, it is concluded that the structural, optical and morphological properties of the fabricated thin films are directly depend on the Ba doping ratio.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 3; 763-767
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phase Transformations in Pyrochlores Irradiated with Swift Heavy Ions: Influence of Composition and Chemical Bonding
    Autorzy:
    Sattonnay, G.
    Thomé, L.
    Sellami, N.
    Monnet, I.
    Grygiel, C.
    Legros, C.
    Tetot, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400452.pdf
    Data publikacji:
    2013-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.80.-x
    61.82.Ms
    61.05.cp
    05.10.-a
    Opis:
    $Gd_2Ti_2O_7$ and $Gd_2Zr_2O_7$ pyrochlores were irradiated with swift heavy ions in order to investigate the effects of the chemical composition on the structural changes induced by high electronic excitation. The XRD results show that the structural modifications induced by irradiation with 93 MeV Xe ions are strongly dependent on the sample composition: $Gd_2Ti_2O_7$ is readily amorphized, whereas $Gd_2Zr_2O_7$ is transformed into a radiation-resistant anion-deficient fluorite structure. Atomistic simulations with the second-moment tight-binding QEq model allow us to calculate the lattice properties of both $Gd_2Ti_2O_7$ and $Gd_2Zr_2O_7$, and also to quantify the degree of covalency and ionicity in these compounds. These calculations clearly show that $Gd_2Ti_2O_7$ is more covalent than $Gd_2Zr_2O_7$, thus confirming that the amorphization resistance can be related to the covalent character of insulators.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 5; 862-866
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Substrate on Crystallographic Quality of AlGaN/GaN HEMT Structures Grown by Plasma-Assisted MBE
    Autorzy:
    Wierzbicka, A.
    Żytkiewicz, Z.
    Sobańska, M.
    Kłosek, K.
    Łusakowska, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1431598.pdf
    Data publikacji:
    2012-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.cp
    61.05.cm
    81.15.Hi
    68.55.-a
    Opis:
    Results of characterization of AlGaN/GaN high electron mobility transistor (HEMT) structures grown by plasma-assisted molecular beam epitaxy (PAMBE) are reported. High resolution X-ray diffraction (HRXRD) and X-ray reflectivity (XRR) were applied to show that structural properties of the AlGaN/GaN layers strongly depend on the substrate used for growth. It has been found that an additional 10 μm thick HVPE GaN layer grown on a commercial GaN/sapphire substrate significantly improves structural quality of AlGaN layer. However, the best structural parameters have been obtained for the HEMT sample grown on free-standing HVPE bulk GaN substrate.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 4; 899-902
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure of Melt-Spun Co₂MnAl Heusler Alloy
    Autorzy:
    Piovarči, S.
    Diko, P.
    Kavečanský, V.
    Ryba, T.
    Vargová, Z.
    Varga, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032646.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.55.-a
    75.50.Cc
    61.05.cp
    Opis:
    The growth-related microstructure and texture of the Co₂MnAl-type Heusler alloy in the form of a melt-spun ribbon was studied by electron microscopy, electron backscattered diffraction and X-ray diffraction. It is shown that melt spinning produces a single-phase disordered Heusler alloy. The fine grain structure at the wheel side of the ribbon exhibits no texture, while dominant columnar grain structure formed on the free surface side exhibits the ⟨111⟩ fibre texture with a declination by about 10 degrees in the spinning direction. The dendritic growth of columnar crystals causes inhomogeneity of the chemical composition on a micrometre scale with a higher Co and Al concentration in the centre of dendritic arms and a higher concentration of Mn at the dendrite arm boundaries.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 881-883
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of Glass Transition and Crystallization Behavior in $Ga_{15}Se_{85 - x}Pb_x$ (0 ≤ x ≤ 6) Chalcogenide Glasses
    Autorzy:
    Khan, Z.
    Khan, S.
    Alvi, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400308.pdf
    Data publikacji:
    2013-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.43.Dq
    61.05.cp
    64.70.p
    64.70.dg
    65.60.+a
    Opis:
    There has been a growing interest in the synthesis and characterization of amorphous chalcogenide glasses due to their importance in preparing electronic memories, grating, switching devices and their optical applications as good IR transmitting materials. The study of the glass transformations and crystallization processes in the amorphous systems is interesting not only from the fundamental aspect of establishing the reaction mechanism of crystal nucleation and growth, but also from a technological point of view. The present research work is concentrated on the study of glass transition and crystallization behavior in $Ga_{15}Se_{85 - x}Pb_x$ with x=0, 3, and 6 chalcogenide glasses by differential scanning calorimetry. Their amorphous nature has been verified by X-ray diffraction. The differential scanning calorimetry experiments were performed at different continuous heating rates (5 to 25 K/min). The glass transition temperature (T_{g}) and crystallization temperature $(T_{c})$ of these glasses has been determined from differential scanning calorimetry thermograms. The dependence of $T_{g}$ and $T_{c}$ on the heating rate (β) has been used for the determination of different crystallization parameters such as the activation energy of crystallization (Δ $E_{c}$), the activation energy for structural relaxation (Δ $E_{t}$) and the order parameter (n). The results of crystallization were discussed on the basis of different models such as Kissinger's approach and modification for non-isothermal crystallization in addition to Johnson, Mehl, Ozawa and Avrami.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 1; 80-86
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Selected Properties of ZnO Coating on Mg-Based Alloy for Biomedical Application
    Autorzy:
    Kania, A.
    Pilarczyk, W.
    Babilas, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1029768.pdf
    Data publikacji:
    2018-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.55.-a
    61.05.cp
    68.37.Ps
    82.45.Bb
    Opis:
    Magnesium and its alloys are interesting materials for biodegradable implant applications. Magnesium alloys have very good strength properties, they are lightweight, but their main disadvantage is a low corrosion resistance in the physiological environment. Various modifications of a Mg alloys surface by deposition of different coatings are used to prevent untimely dissolution. The article presents the investigation results of a thin ZnO coating deposited on a MgCa2Zn1Gd3 alloy by means of the magnetron sputtering method. The studies include: scanning electron microscope observation of the ZnO surface, X-ray phase analysis, surface roughness measurement in atomic force microscopy, the microhardness test and potentiodynamic corrosion resistance test in the Ringer solution at 37°C. It was found that the ZnO coating is compact and continuous. It increases the hardness of the MgCa2Zn1Gd3 alloy and also improves its corrosion resistance. The corrosion potential is shifted slightly towards the positive values from -1.52 V to -1.50 V for the alloy with the ZnO coating.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 2; 222-224
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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