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    Wyświetlanie 1-9 z 9
    Tytuł:
    The Influence of Argon on the Deposition and Structure of Polycrystalline Diamond Films
    Autorzy:
    Benzhour, K.
    Szatkowski, J.
    Rozpłoch, F.
    Stec, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1535896.pdf
    Data publikacji:
    2010-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.55.A-
    Opis:
    Thin polycrystalline diamond films were deposited on prepared (100) Si substrate by hot filament chemical vapor deposition using a mixture of hydrogen, propane-butane and argon. During investigations the gas flow of argon was varied from 100 sccm to 400 sccm. Scanning electron microscopy analysis revealed that the addition of argon to the gas phase influenced the growth rate and film structure. An increase of argon concentration provokes an increase in film porosity and decrease in crystalline facetting. The quality of these films was investigated with the use of the Raman spectroscopy.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 3; 447-449
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling the Boronizing Kinetics in AISI 316 Stainless Steel
    Autorzy:
    Nait Abdellah, Z.
    Keddam, M.
    Elias, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1419004.pdf
    Data publikacji:
    2012-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.Aa
    68.55.A-
    68.47.De
    68.55.jd
    Opis:
    This work deals with the simulation of the growth kinetics of the $(FeB//Fe_2B)$ bilayer and the diffusion zone on a substrate of AISI 316 stainless steel exposed to the powder-pack boriding process, in the temperature range of 1123-1273 K and a time duration ranging from 2 to 10 h. The developed diffusion model employs a set of mass balance equations at the three growth fronts: [$(FeB//Fe_2B),$ (FeB/diffusion zone) and (diffusion zone/substrate)] under certain assumptions, including the effect of the incubation times during the formation of iron borides and the diffusion zone. For this purpose, a computer code written in Matlab (version 6.5) was created to simulate the boriding kinetics. A good concordance was obtained when comparing the experimental parabolic growth constants taken from the literature and the simulated values of the parabolic growth constants: ($k_{FeB},$ $k_1$ and $k_2$). Moreover, the present model was also used to predict the thicknesses of the $FeB$ and $Fe_2B$ layers and the diffusion zone thickness at various treatment times and boriding temperatures. The simulated values were in good agreement with the experimental borided layers thicknesses.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 3; 588-592
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of the Diffusion Coefficients of Boron in the FeB and Fe₂B Layers Formed on AISI D2 Steel
    Autorzy:
    Keddam, M.
    Nait Abdellah, Z.
    Kulka, M.
    Chegroune, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402143.pdf
    Data publikacji:
    2015-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.Aa
    68.55.A-
    68.47.De
    68.55.jd
    Opis:
    In the present work, a diffusion model was applied to estimate the boron diffusion coefficients in the FeB and Fe₂B layers during the pack-boriding of AISI D2 steel in the temperature range of 1223-1323 K during a variable exposure time between 1 and 8 h. The mass balance equations were formulated at each growing interface by considering the effect of boride incubation times. The estimated values of boron activation energies in the FeB and Fe₂B layers were compared with the literature data. Validation of the present model was made by comparing the experimental thickness of each boride layer, taken from the literature data, with the predicted values. In addition, a simple equation was suggested to estimate the required time to obtain a single Fe₂B layer by diffusion annealing.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 4; 740-745
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Diffusion Model for the Fe_{2}B Layers Formed on a Ductile Cast Iron
    Autorzy:
    Keddam, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398194.pdf
    Data publikacji:
    2018-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.Aa
    68.55.A-
    68.47.De
    68.55.jd
    Opis:
    In this work, a diffusion model was applied to estimate the boron diffusion coefficients in the $Fe_{2}B$ layers on the ASTM A-536 ductile iron in the temperature range 1173-1273 K by the powder-pack boriding. The mass balance equation at the ($Fe_{2}B$/substrate) interface was formulated considering the effect of boride incubation times. As a result, the value of activation energy for boron diffusion in the ductile iron was estimated and compared with the literature. To verify the validity of the present model, the experimental $Fe_{2}B$ layer thickness obtained at 1173 K for 10 h was compared to the predicted value. A good concordance was observed between the predicted value of $Fe_{2}B$ layer thickness and the experimental data.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 5; 1174-1177
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Crystallisation Kinetics of Co_{75-x}M_xSi_{15}B_{10} (M = Fe, Mn, Cr and x=0, 5) Amorphous Alloys
    Autorzy:
    Bayri, N.
    Kolat, V.
    Izgi, T.
    Atalay, S.
    Gencer, H.
    Sovak, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398669.pdf
    Data publikacji:
    2016-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Kj
    65.40.-b
    68.55.A-
    Opis:
    In this study, the effect of Fe, Mn and Cr substitution for Co on the crystallization kinetics of amorphous $Co_{75-x}M_xSi_{15}B_{10}$ (M = Fe, Mn and Cr; x=0 and 5) alloys were investigated. The broad diffraction peaks in the X-ray diffraction patterns for as-quenched ribbons indicated that all of the samples exhibit an amorphous structure. The activation energies of the alloys were calculated from differential thermal analysis data using the Kissinger, Ozawa and Augis-Bennett models. The increased activation energy for Fe, Mn and Cr doped samples indicated that the thermal stability and the crystallization kinetics were improved in the doped samples. The value of the Avrami exponent indicated that the crystallization is typical diffusion controlled three-dimensional growth for all of the samples.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 1; 84-87
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural and Optical Properties of Antimony-Containing Epitaxial Layers Grown on GaSb by MOCVD
    Autorzy:
    Wesołowski, M.
    Strupiński, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807649.pdf
    Data publikacji:
    2009-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.Gh
    81.05.Ea
    68.55.A-
    68.55.ag
    68.55.J-
    68.55.Nq
    Opis:
    Experimental results on MOCVD epitaxy of some antimonides on GaSb substrates are presented. Specific technological problems, which effect in narrow window of process parameters, were overcome and good quality of GaSb/GaSb, InGaSb/GaSb and InGaAsSb/GaSb layers was obtained. Structural, optical and electrical characterisation data are shown and discussed. Developed technology can state a ground work for realisation of antimonide-based optoelectronic devices.
    Źródło:
    Acta Physica Polonica A; 2009, 116, S; S-62-S-64
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization of Polycrystalline CVD Diamond Seeding with the Use of sp³/sp² Raman Band Ratio
    Autorzy:
    Golunski, L.
    Sobaszek, M.
    Gardas, M.
    Gnyba, M.
    Bogdanowicz, R.
    Ficek, M.
    Plotka, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402345.pdf
    Data publikacji:
    2015-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.Gh
    81.05.ug
    82.80.Gk
    68.55.A-
    Opis:
    The influence of various nanodiamond colloids used for seeding nondiamond substrates in microwave plasma enhanced chemical vapour deposition diamond process was investigated. Colloids based on deionized water, isopropanol alcohol and dimethyl sulfoxide (DMSO) were used with different grain size dispersion: 150, 400 and 35 nm, respectively. The influence of growth time was also taken into consideration and bias enhanced nucleation. Microcrystalline diamond films were deposited on the seeded substrates in microwave plasma chemical vapour deposition using hydrogen-methane gas mixture. Seeding efficiency was investigated by means of scanning electron microscopy and Raman spectroscopy. Authors defined the new factor called as diamond ideality factor (di) which can give a quick estimation of quality of film and relative sp³ content. Few main peaks were identified at the following wave numbers: diamond sp³ peak 1332 $cm^{-1}$, D band peak 1355 $cm^{-1}$, C-H bending peak 1440-1480 $cm^{-1}$ and G band peak 1560 $cm^{-1}$. The best di was achieved for DMSO based colloid in all cases. The application of bias enhanced nucleation increases the diamond crystals size and the sp³/sp² ratio.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 1; 136-140
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nanocrystalline CVD Diamond Coatings on Fused Silica Optical Fibres: Optical Properties Study
    Autorzy:
    Ficek, M.
    Bogdanowicz, R.
    Ryl, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402648.pdf
    Data publikacji:
    2015-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.Gh
    81.05.ug
    82.80.Gk
    68.55.A-
    78.66.Qn
    Opis:
    Seeding and growth processes of thin diamond films on fused silica optical fibres have been investigated. Glass pre-treatment by dip coating in two detonation nanodiamond (DND) seeding media has been studied. The DND suspension in ethyl alcohol and dispersion of DND in dimethyl sulfoxide (DMSO) with polyvinyl alcohol (PVA) were chosen for the seeding purpose. The grain size distribution of nanodiamond particles in both seeding media was kept at the same level (approximately 10-50 nm). After the seeding nanocrystalline diamond films were deposited on the fibres using microwave plasma assisted chemical vapour deposition system. The results of the process were investigated using numerical analysis of scanning electron microscopy images. The molecular structure of diamond has been examined with micro-Raman spectroscopy. Thickness, roughness and optical properties of the nanocrystalline diamond films in VIS-NIR wavelength range were investigated on reference samples using spectroscopic ellipsometry. Light reflection at the fibre end-face for different deposition parameters was also investigated. Proposed seeding method can be further effectively applied for manufacturing of optical fibre sensors. Due to extraordinary properties of diamond, which include high chemical and mechanical resistance, such films are highly desired for optical sensing purposes.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 3; 868-873
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sponge-like Porous ZnO Photoanodes for Highly Efficient dye-sensitized Solar Cells
    Autorzy:
    Sacco, A.
    Lamberti, A.
    Berardone, I.
    Bianco, S.
    Gazia, R.
    Pugliese, D.
    Quaglio, M.
    Tresso, E.
    Pirri, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399944.pdf
    Data publikacji:
    2013-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.Cd
    68.55.A-
    68.55.J-
    81.05.Rm
    72.20.Jv
    72.40.+w
    73.40.Mr
    88.40.H-
    Opis:
    We propose a 3D branched ZnO nanostructure for the fabrication of highly efficient dye-sensitized solar cell photoanodes. A coral-shaped structured Zn layer was deposited by radio frequency magnetron sputtering at room temperature onto fluorine-doped tin oxide/glass sheets and then thermally oxidized in ambient atmosphere, obtaining a high-density branched ZnO film. The porous structure provides a large surface area, and, as a consequence, a high number of adsorption sites, and the size and spacing of the nanostructures (on the order of the exciton diffusion length) are optimal for good electron collection efficiency. The proposed synthesis technique is simple and scalable and the reproducibility of the growth results was tested. The crystalline phase of the film was investigated, evidencing the complete oxidation and the formation of a pure wurtzite crystalline structure. ZnO-based solar harvesters were fabricated in a microfluidic architecture, using conventional sensitizer and electrolyte. The dependence of the cell efficiency on dye incubation time and film thickness was studied with I-V electrical characterization and electrochemical impedance spectroscopy. The obtained conversion efficiency values, with a maximum value of 4.83%, confirm the highly promising properties of this material for the implementation in dye-sensitized solar cell photoanodes.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 2; 386-389
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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