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    Wyświetlanie 1-5 z 5
    Tytuł:
    Effect of Urea on Synthesis of Ceramics Materials by the Modified Combustion Method
    Autorzy:
    Cruz, D.
    Ortíz-Oliveros, H.
    Rivera Zepeda, A.
    Rosano-Ortega, G.
    Tepale Ochoa, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401882.pdf
    Data publikacji:
    2015-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    64.70.ph
    28.41.Bm
    88.20.jj
    Opis:
    The proportion of urea in the modified combustion method to prepare lithium metasilicate (Li₂SiO₃) powders was investigated. Reactions were performed using LiOH:H₂SiO₃:CH₄N₂O in molar ratios of 1:1:1, 1:1:2, 1:1:3, 1:1:4 and 1:1:5 which were heated at 450°C during 5 min. It was found, by X-ray diffraction, that LiOH:H₂SiO₃:CH₄N₂O in the ratio of 1:1:3 was the more adequate molar ratio to produce mainly Li₂SiO₃. It was observed that excess of urea produced mainly silicium dioxide (SiO₂) in coesite phase instead Li₂SiO₃. Thermogravimetric analyses showed that decomposition products of urea, such as biuret, cyanic acid and cyanuric acid, were found in samples prepared with high proportions of urea (1:1:4 and 1:1:5). Carbonates identified by IR spectroscopy were found in samples prepared with LiOH:H₂SiO₃:CH₄N₂O in 1:1:1, 1:1:2, 1:1:3, 1:1:14 and 1:1:5 molar ratios.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 3; 336-339
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of p-Layer Doping Density and Surface Band Bending on the Indium Tin Oxide/Hydrogenated Amorphous Silicon Heterojunction Solar Cells
    Autorzy:
    Rached, D.
    Madani Yssad, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398948.pdf
    Data publikacji:
    2015-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.61.Jc
    71.20.Mq
    88.40.hj
    88.40.jj
    Opis:
    A solar cell (indium tin oxide (ITO)/p-doped amorphous silicon (p-a-Si:H)/intrinsic polymorphous silicon (i-pm-Si:H)/n-doped crystalline silicon (n-c-Si)) simulation, focused on p-layer doping density NA and surface band bending $E_\text{sbb}$ at the interface ITO/p-layer has been performed. Despite the deterioration of p-layer material quality with doping density, the reduced bulk recombination was found to compensate for the increased loss in the p-layer. An increase of p-layer doping density NA and contact barrier height $\phi_{b0}$ (variation of the surface band bending $E_\text{sbb}$) leads to an increase of the efficiency of heterojunction with intrinsic thin layer solar cells.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 3; 767-769
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of degradation of electrical properties after thermal oxidation of p-type Cz-silicon wafers
    Autorzy:
    Maoudj, M.
    Bouhafs, D.
    Bourouba, N.
    Khelifati, N.
    El Amrani, A.
    Boufnik, R.
    Hamida Ferhat, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1054957.pdf
    Data publikacji:
    2017-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.20.Jv
    81.16.Pr
    88.40.jj
    Opis:
    In this study we conducted thermal oxidation of Czochralski p-type <100> silicon wafers. The oxidation was carried out at temperatures in the range of 850-1000°C, in a gas mixture of N₂:O₂, in order to deposit a thin layer (10 nm) of thermal silicon dioxide (SiO₂), generally used in the surface passivation of solar cells. The measurements of effective minority carriers lifetime τ_{eff} using the quasi-steady-state photoconductance have shown degradation of different samples after oxidation process. The calculation of surface recombination velocity after the oxidation process at different temperatures, gave the same value of 40 cm s¯¹, showing a low surface recombination velocity and, therefore, a good surface passivation. Finally, a study based on sample illumination technique, allowed us to conclude that our samples are dominated by bulk Shockley-Read-Hall recombination, caused by Fe-related centers, thereby causing the degradation of the lifetime of minority carriers.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 3; 725-727
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Hydrogen on the Stress Relaxation of Aged NiTi Shape Memory Alloys
    Autorzy:
    Elkhal Letaief, W.
    Hassine, T.
    Gamaoun, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398759.pdf
    Data publikacji:
    2016-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    62.20.FG
    88.30.EM
    87.85.JJ
    Opis:
    The susceptibility of the NiTi shape memory alloy to relaxation after the hydrogen charging in an aqueous solution has been investigated with respect to ageing during one to six days in air at room temperature. The orthodontic wires have been prepared by immersing in a 0.9% NaCl solution for 3 h, under applied current density of 10 A/m^2 and then relaxed with an imposed deformation in a fully austenite state of structure and in a state with 1/3 and 2/3 of the martensite volume fraction. Through the stress relaxation, the hydrogen-charged specimen has shown a significant decrease of the stress, compared to the non-immersed alloy, when the imposed deformation was located in the plateau of the austenite-martensite transformation. It was also found that a longer ageing period is important and the properties of the wires with longer stress relaxation are similar to the those of non-charged wires. Nevertheless, no difference has been detected between the as-received and the as-charged specimens when the imposed deformation was located in the elastic deformation region of the fully austenitic structure. This behavior is attributed to the effect of the gradient of absorbed hydrogen, existing between the surface and the center axis of the studied wires, which facilitates the mobility of the martensite bands during the stress relaxation.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 4; 714-716
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ion Beam Formation of Electrocatalysts for Direct Methanol and Ethanol Fuel Cells on the Basis of Carbon Catalyst Supports
    Autorzy:
    Poplavsky, V.
    Dorozhko, A.
    Luhin, V.
    Matys, V.
    Zukowski, P.
    Czarnacka, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1033764.pdf
    Data publikacji:
    2017-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.37.Hk
    81.15.Jj
    81.05.U-
    82.45.Jn
    82.80.Fk
    82.80.Yc
    88.20.ff
    88.30.pd
    88.30.pf
    Opis:
    Ion-beam modification of materials whose service properties are mainly controlled by the surface composition is of especial interest, in particular, for electrocatalysts, namely electrodes of fuel cells - perspective chemical current sources. A catalyst is needed for effective operation of fuel cell. In this paper active layers of the electrocatalysts were prepared by ion beam assisted deposition of catalytic (platinum) and activating (cerium) metals onto carbon (AVCarb® Carbon Fiber Paper P50 and Toray Carbon Fiber Paper TGP-H-060 T) catalyst supports. Formation of layers by ion beam assisted deposition by means of the deposition of metal and mixing of precipitating layer with the substrate by accelerated ions of the same metal, was carried out. Metal deposition and mixing between the precipitable layer and surface of the substrate by accelerated (U=10 kV) ions of the same metal were conducted from a neutral vapor fraction and plasma of vacuum arc discharge of a pulsed electric arc ion source. Study of the morphology and composition of layers was carried out by the scanning electron microscopy, energy dispersive X-ray microanalysis, X-ray fluorescence analysis, and the Rutherford backscattering spectrometry methods. According to the investigations with the use of cyclic voltammetry, the electrocatalysts with the prepared layers exhibited catalytic activity in the reactions of electrochemical oxidation of methanol and ethanol, which form the basis for the principle of operation of low temperature direct methanol and direct ethanol fuel cells.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 2; 278-282
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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