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    Wyświetlanie 1-6 z 6
    Tytuł:
    Diffusion of Potassium on Nickel
    Autorzy:
    Błaszczyszynowa, M.
    Błaszczyszyn, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1892562.pdf
    Data publikacji:
    1992-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.35.Fx
    79.70.+g
    79.90.+b
    Opis:
    The surface diffusion of a potassium dose corresponding to the average coverage Θ̅$\text{}_{K}$ = 1.5 on nickel was studied using the field emission technique in the temperature range of 78-133 K. In general, under such conditions diffusion proceeds with the sharp moving boundary and the activation energy Q from 0.16 eV to 0.36 eV dependently on the crystallographic directions. Free boundary migration with the energy Q < 0.16 eV is expected on the close-packed regions {111} and {001} already at liquid N$\text{}_{2}$ temperature. The results are discussed in relation to the atomic structure of the nickel substrate taking into account the interaction in the adsorption layer.
    Źródło:
    Acta Physica Polonica A; 1992, 81, 2; 285-294
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Diffusion of Palladium on Tantalum Microcrystal
    Autorzy:
    Antczak, G.
    Błaszczyszyn, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035655.pdf
    Data publikacji:
    2003-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    79.70.+q
    68.37.Vj
    68.43.Jk
    05.40.Ca
    Opis:
    Surface diffusion of palladium,Θ=2 ML, on a tantalum microcrystal was studied by means of field electron emission microscopy within the temperature range 665-790 K. The observed sharp moving boundary-diffusion proceeds with an activation energy ranging from 1.25 to 1.7 eV/atom, depending on the crystallographic direction.
    Źródło:
    Acta Physica Polonica A; 2003, 103, 1; 57-65
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Self-Diffusion of Tungsten on Some Facets of Tungsten Microcrystal
    Autorzy:
    Biernat, T.
    Błaszczyszyn, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811508.pdf
    Data publikacji:
    2008-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    79.70.+q
    68.90.+g
    05.40.-a
    Opis:
    The field emission current fluctuation method was applied to investigate surface self-diffusion of tungsten on the (311) and (711) regions (along the zone line (211)-(100)) of a tungsten microcrystal (in the form of the field emitter tip of radius about 300 nm) in the temperature range 500-850 K. The surface diffusion parameters were obtained from spectral analysis of the current fluctuations. The results are discussed from the aspects of the substrate structure.
    Źródło:
    Acta Physica Polonica A; 2008, 114, S; S-11-S-16
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Surface Self-Diffusion of Iridium: Field Electron Emission Study
    Autorzy:
    Antczak, G.
    Błaszczyszyn, M.
    Błaszczyszyn, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2014253.pdf
    Data publikacji:
    2000-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.16.-d
    68.35.Fx
    68.90.+g
    68.55.-a
    Opis:
    The self-diffusion of iridium was studied by means of field electron microscopy. The measurements, based on the well-known process of surface build-up, were carried out under the UHV conditions within the temperature range of 790-935K. The activation energy for the diffusion was determined to be equal to 2.10±0.10eV/atom (48.4±2.3kcal/mol). This value is compared with activation energies for self-diffusion on other metal surfaces, as well as with those for self-diffusion of single iridium atoms and clusters on iridium, known from the field ion microscopy measurements.
    Źródło:
    Acta Physica Polonica A; 2000, 98, 4; 383-388
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adsorption of H$\text{}_{2}$O on Pt Field Emitter: Surface Diffusion and Field-Induced Effects
    Autorzy:
    Blaszczyszynowa, M.
    Błaszczyszyn, R.
    Bryl, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933649.pdf
    Data publikacji:
    1995-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    79.90.+b
    68.35.Fx
    79.70.+q
    Opis:
    Adsorption of an Η$\text{}_{2}$O layer onto a Pt field emitter tip under the influence of an electric field and the surface diffusion of water were studied by using the field electron microscopy method. The presence of a negative field (field electron microscopy mode of operation), examined in the range of 33-44 MV/cm, significantly reduced the water coverage on the emitter at temperatures above 120 K. The reduction could also occur upon drawing a high density field emission current when the emitter was kept at 78 K. Surface diffusion of water, which was observed in the temperature range 120-132 K, corresponded to the "unrolling the carpet" mechanism and started from a water multilayer to a surface region water- and/or hydrogen-submonolayer covered. This was accompanied by the transition process from the state of the current- and field-induced redistribution of Η$\text{}_{2}$O to the state of thermal equilibrium. The activation energy of the diffusion was found to be 19 and 25 kJ/mol depending on the crystallographic direction. A positive electric field of 44 MV/cm, which was applied at temperatures of the substrate in excess of 121 K, decreased the field emission of the system and raised the desorption temperature of the layer over 720 K. It is assumed that the negative electric field causes reorientation of Η$\text{}_{2}$O molecules at the surface of platinum tip. The positive as well as negative electric fields promote the field desorption of water, which is in accordance with the results reported before.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 3; 511-526
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Diffusion of Potassium on the W(112) Plane Preadsorbed by Ni Atoms: Field Emission Current Fluctuations - Autocorrelation Study
    Autorzy:
    Biernat, T.
    Błaszczyszyn, R.
    Kleint, Ch.
    Powiązania:
    https://bibliotekanauki.pl/articles/2027391.pdf
    Data publikacji:
    2001-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    79.70.+q
    68.37.Vj
    68.43.Jk
    05.40.Ca
    Opis:
    Diffusion of potassium adsorbate on the W(112) plane with preadsorbed nickel was investigated by means of the autocorrelation function of field emission current fluctuations. A comparison of the experimental autocorrelation function with that of a theoretical calculation by Gesley and Swanson gives the surface diffusion coefficient of potassium. From its temperature dependence the diffusion activation energy at several Ni pre-coverages for a constant potassium coverage (Θ$\text{}_{K}$=0.4) is derived. The dependence of the activation energy for potassium surface diffusion on the nickel coverage - first reduction and then an increase with increasing Ni coverage - is observed. This is in agreement with the results obtained from the spectral analysis of the field emission current fluctuations of the same system. The decrease is understood to be a result of the smoothing effect caused by Ni atoms on the W(112) plane.
    Źródło:
    Acta Physica Polonica A; 2001, 99, 6; 665-672
    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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