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    Wyświetlanie 1-3 z 3
    Tytuł:
    Electrochemical and Corrosion Behavior of Nanocrystalline TiNi-Based Alloys and Composite
    Autorzy:
    Balcerzak, M.
    Jurczyk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1375097.pdf
    Data publikacji:
    2014-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.47.Cb
    88.30.rd
    Opis:
    In this work TiNi-based nanocrystalline alloys and composite were produced by mechanical alloying process with subsequent annealing at 750°C for 0.5 h. Mechanical alloying was performed in a SPEX 8000 Mixer Mill. TiNi alloy was chemically modified by Ag elemental powder. Silver content equaled 5 wt%. X-ray diffraction analyses revealed formation of TiNi main phase after annealing. Additionally, two minor phases $Ti_2Ni$ and $TiNi_3$ were detected for unmodified alloy. Crystallites of obtained powders were nanosized. Corrosion and electrochemical measurements were performed in 6 M KOH solution. All synthesized materials were used as negative electrode for $Ni-MH_x$ batteries. Ag addition positively affects on stability of discharge capacity of TiNi alloy during of charge/discharge tests.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 4; 888-891
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Chemical Modification by Silver on Hydrogen Storage Properties of Nanocrystalline $Ti_2Ni$ Alloy
    Autorzy:
    Balcerzak, M.
    Jurczyk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1375114.pdf
    Data publikacji:
    2014-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.47.Cb
    88.30.rd
    Opis:
    In this study mechanical alloying process with subsequent annealing at 750°C for 0.5 h were used to produce $Ti_2Ni$-based nanocrystalline alloys and composite. To improve electrochemical properties, Ti-Ni-based alloy was chemically modified by 5 wt% of silver powder. X-ray diffraction analyses showed formation of nanocrystalline $Ti_2Ni$ main phase. Electrochemical studies revealed a positive effect of chemical modification by silver on $Ti_2Ni$ alloy. All synthesized materials were used as negative electrodes for $Ni-MH_x$ batteries. The highest discharge capacity equaled 303 mAh/g, at 40 mA/g discharge current. All electrochemical measurements were done in 6 M KOH solution.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 4; 892-894
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Calculations of Molecular Structures and Processes Important for Hydrogen Behaviour in the Li-Amide/Imide System
    Autorzy:
    Ivanović, N.
    Radisavljević, I.
    Novaković, N.
    Manasijević, M.
    Colognesi, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1503321.pdf
    Data publikacji:
    2011-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    31.15.ae
    33.15.Dj
    33.15.Mt
    88.30.rd
    71.20.Ps
    Opis:
    Lithium amide $(LiNH_{2})$ and imide $(Li_{2}NH)$ have recently attracted much attention as part of the Li-H-N system suitable for hydrogen (H) storage applications. However, the ground-state imide structure is still unknown with at least six candidate structures, with ground state energies all very close to one another. In order to discover possible pathways for the imide-amide-imide transformations during the hydrogen absorption/desorption cycles, we have examined the molecular structures involved (along with their changes during these processes) using ab-initio calculations based on the linear combination of atomic orbitals (LCAO). In addition, the influence of Li substitution by some other elements of interest on the system behaviour was investigated. These analyses were complemented by density functional theory (DFT) calculations of several crystal structures appearing in the processes. In this way a thorough insight into the structures and the processes taking place at atomic level is attained, providing a starting point for understanding these complicated systems, and the mechanisms governing their transformations.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 2; 242-245
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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