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Self-Diffusion of Tungsten on Some Facets of Tungsten Microcrystal

100%
Biernat T., Błaszczyszyn R.
Acta Physica Polonica A
|
2008
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vol. 114
|
issue S
S-11-S-16
EN
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.
2
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Investigation of Self-Diffusion of Titanium by Fluctuation Autocorrelation Method

81%
Dąbrowski A. M., Biernat T., Bęben J., Gubernator W.
Acta Physica Polonica A
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1997
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vol. 91
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issue 6
1091-1095
EN
Diffusion of titanium was examined in the field emission microscope using the fluctuation autocorrelation method. A thick titanium layer (about three monolayers) deposited on a tungsten tip was used. A temperature range of 1260-1410 K was found where diffusion can be described in a hydrodynamic approximation. In this temperature range the diffusion coefficient seems to comply with Arrhenius rule for the activation energy of 1.31 eV and D_{0} = 3×10^{-7} cm^{2}s.
3
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Diffusion of Potassium on the W(112) Plane Preadsorbed by Ni Atoms: Field Emission Current Fluctuations - Autocorrelation Study

81%
Biernat T., Błaszczyszyn R., Kleint C.
Acta Physica Polonica A
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2001
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vol. 99
|
issue 6
665-672
EN
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_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.
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