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Wyszukujesz frazę "61.55.Hg" wg kryterium: Temat

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    Wyświetlanie 1-10 z 10
    Tytuł:
    Surface Stability of Ordered Ga$\text{}_{0.5}$In$\text{}_{0.5}$P and GaAs$\text{}_{0.5}$Sb$\text{}_{0.5}$ Alloys
    Autorzy:
    Bogusławski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1877570.pdf
    Data publikacji:
    1991-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.55.Hg
    68.65.+g
    68.60.Dv
    Opis:
    Formation enthalpies of (001) surfaces terminating ordered Ga$\text{}_{0.5}$In$\text{}_{0.5}$P and GaAs$\text{}_{0.5}$Sb$\text{}_{0.5}$ alloys were calculated using the VFF model. For several ordered phases, chemically ordered surfaces were found to be stable against surface segregation. In particular, even phases unstable against bulk segregation may be terminated by a stable surface.
    Źródło:
    Acta Physica Polonica A; 1991, 79, 1; 125-128
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Luminescence and EPR Characterisation of Neutron Transmutation Doped Gallium Phosphide
    Autorzy:
    Gołdys, E.
    Godlewski, M.
    Sienkiewicz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1879964.pdf
    Data publikacji:
    1991-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.80.Hg
    78.55.Cr
    76.30.Lh
    Opis:
    The photoluminescence and EPR measurements of neutron irradiated and annealed GaP samples are presented. Both methods confirm the presence of neutral Ge$\text{}_{Ga}$. The EPR spectrum gives also an indication of interstitial Ge.
    Źródło:
    Acta Physica Polonica A; 1991, 79, 2-3; 259-262
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermodynamic Stability of Two Rhombohedral Phases of Si$\text{}_{0.5}$Ge$\text{}_{0.5}$ Alloy
    Autorzy:
    Bogusławski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1890689.pdf
    Data publikacji:
    1991-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.55.Hg
    68.35.Md
    68.60.Dv
    Opis:
    Thermodynamic stability of two ordered phases, RS1 and RS2, of Si$\text{}_{0.5}$Ge$\text{}_{0.5}$ alloy is considered. Bulk and surface formation enthalpies are calculated using the model Tersoff's potential. RS2 structure is unstable, but its (001) ordered surface is stable against segregation. Properties of RS1 are just the opposite.
    Źródło:
    Acta Physica Polonica A; 1991, 80, 2; 299-302
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Coadsorption of Beryllium and Potassium on a (001) Tungsten Plane
    Autorzy:
    Dworecki, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1892314.pdf
    Data publikacji:
    1992-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.55.Hg
    73.30.+y
    79.70.+q
    Opis:
    The adsorption and coadsorption of beryllium and potassium on the tungsten (001) plane was studied using a probe-hole field electron microscope (FEM). Measurements were made at 78 K for potassium and at 300 K for beryllium. It has been found that the adsorption of potassium decreases and that of beryllium increases the work function of the W(001) plane. At small coverages with potassium atoms (θ$\text{}_{k}$ < 0.2) on the W(001) plane successive evaporation of beryllium atoms causes a decrease of the work function. At larger coverages with potassium atoms an opposite effect is observed. An attempt has been made to compare the experimental results with the theoretical models suggested recently.
    Źródło:
    Acta Physica Polonica A; 1992, 81, 1; 125-129
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Extended X-Ray Absorption Fine Structure Evidence for Homopolar Bonding in Amorphous Cd-As and Zn-P
    Autorzy:
    Burian, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1920901.pdf
    Data publikacji:
    1992-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.10.Lx
    61.55.Hg
    78.30.Fs
    Opis:
    Local atomic arrangement in evaporated amorphous Cd-As and Zn-P films was investigated by extended X-ray absorption fine structure. Results of modelling indicate that bonds between atoms of the same kind occur for both (Cd,Zn)-rich and (As,P)-rich compositional regions. This specific chemical ordering, much alike to that in the corresponding crystalline polymorphs, appears to play a predominant role in determining of the local structures in these materials.
    Źródło:
    Acta Physica Polonica A; 1992, 82, 2; 309-313
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lattice Site Occupancy in Ternary Ordered Ni$\text{}_{3}$Al$\text{}_{1-x}$Fe$\text{}_{x}$ Alloys Estimated by EXAFS
    Autorzy:
    Ławniczak-Jabłońska, K.
    Pascarelli, S.
    Boscherini, F.
    Kozubski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1920905.pdf
    Data publikacji:
    1992-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.10.Lx
    61.55.Hg
    Opis:
    Extended X-ray absorption fine structure (EXAFS) spectroscopy offers additional experimental evidence to the solution of site occupancy problem in ternary NiAlX alloys. A study of local order in the stoichiometric Ni$\text{}_{3}$Al$\text{}_{1-x}$Fe$\text{}_{x}$ ternary alloys (x = 0.02, 0.05, 0.10, 0.15, and 0.25) by EXAFS at the K-edge of Fe in the energy range from 7000 eV to 7600 eV are presented. Three models of substitutional behavior are considered - the preferential substitution of Fe atoms in: 1) Ni sites, 2) Al sites, 3) both sites. Data analysis was performed with theoretical and experimentally determined scattered photoelectron phases and amplitudes. The results of the EXAFS analysis are consistent with the picture in which most of the Fe atoms substitute Al sites and less than 25% of Fe atoms substitute Ni sites. Alloys with more than 10 at% of Fe showed higher tendency for ordering than those containing less than 10 at% Fe.
    Źródło:
    Acta Physica Polonica A; 1992, 82, 2; 315-322
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Precipitates in Cd$\text{}_{1-x}$Ni$\text{}_{x}$Se Crystals Grown by the Bridgman Method
    Autorzy:
    Kachniarz, J.
    Dynowska, E.
    Miotkowska, S.
    Paszkowicz, W.
    Miotkowski, I.
    Ramdas, A. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1921645.pdf
    Data publikacji:
    1992-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.70.Wp
    61.55.Hg
    81.10.Fq
    Opis:
    Single crystals of Cd$\text{}_{1-x}$Ni$\text{}_{x}$Se alloys (x ranging from 0 to 0.075) were investigated using electron microprobe and X-ray diffraction. The analysis shows the presence of Ni-Se precipitates. The solubility limit of Ni is estimated to be 0.008.
    Źródło:
    Acta Physica Polonica A; 1992, 82, 5; 725-728
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    X-Ray and Electron-Optical Characterization of ZnTe/CdTe and ZnTe/GaAs Epitaxial Layers Obtained by the MBE Method
    Autorzy:
    Auleytner, J.
    Dziuba, Z.
    Górecka, J.
    Pełka, J.
    Regiński, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1931657.pdf
    Data publikacji:
    1994-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.14.Hg
    61.10.-i
    68.55.-a
    Opis:
    X-ray diffraction topography (Bragg diffraction) and X-ray rocking curve measurements were used to study the perfection and structural properties of ZnTe epitaxial layers on the CdTe and GaAs substrates. ZnTe epitaxial layers on CdTe were grown by MBE method by using a machine made in the Institute of Physics of the Polish Academy of Sciences. The ZnTe layers on GaAs were produced on the other, factory-made MBE system. The comparison between the X-ray topographical images of the substrate and epitaxial layer shows that imperfections on the substrate surface cause imperfections in the epitaxial layer. The results of double-crystal diffractometry measurements show that the perfection of the layer on the GaAs substrate is higher than that on the CdTe. The presence of microtwining in the ZnTe layer on the CdTe substrate was confirmed by RHEED measurements. The X-ray standing wave fluorescent spectra were also measured for the samples.
    Źródło:
    Acta Physica Polonica A; 1994, 86, 4; 567-574
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Strain Relaxation of ZnTe/CdTe and CdTe/ZnTe heterostructures: In Situ Study
    Autorzy:
    Riesz, F.
    Kret, S.
    Karczewski, G.
    Wojtowicz, T.
    Kossut, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1952073.pdf
    Data publikacji:
    1996-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.14.Hg
    68.55.Bd
    68.65.+g
    Opis:
    The strain relaxation kinetics of ZnTe/CdTe and CdTe/ZnTe heterostructures grown on GaAs substrates by molecular beam epitaxy are studied by in situ reflection high-energy electron diffraction. The observed critical layer thickness is 5 monolayers for ZnTe/CdTe and less than 1 monolayer for CdTe/ZnTe. The relaxation is anisotropic. Dislocation core parameters and relaxation rate constants were determined using a kinetic model and assuming strain-dependent activation energy of dislocation movement.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 5; 911-914
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adsorption Properties of the Cu(115) Surface: Basic Interfaces
    Autorzy:
    Godowski, P.
    Groso, A.
    Hoffmann, S.
    Onsgaard, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1537740.pdf
    Data publikacji:
    2010-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.43.Fg
    68.55.Ac
    61.14.Hg
    79.60.Dp
    Opis:
    The interfaces: K/Cu(115) and CO/Cu(115) have been characterized using surface sensitive techniques, including low energy electron diffraction and photoelectron spectroscopy. K adatoms show tendency to occupy the sites close to the step edges. At low temperature (near 125 K), after completion of two layers, potassium grows in 3D islands (the Stranski-Krastanov mode). At higher temperature, e.g. at room temperature, potassium introduces reconstruction of the substrate even at low coverages. Calibration of the alkali coverage, up to completion of the first layer, using the work function changes curve has been confirmed as a very convenient and precise procedure. The adsorbed state of CO at 130 K has been identified by registration of core levels obtained by the use synchrotron radiation photoelectron spectroscopy. The characteristics of the main 1s and satellite peaks have been analyzed in context of substrate geometry and compared with the ones of other copper planes. There are no indications of dissociative adsorption of CO, only residual carbon and oxygen were found after adsorbate desorption around 220 K. CO molecules show a strong tendency to "on top" adsorption in sites far from the step edges of the Cu(115) surface.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 6; 928-935
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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