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    Wyświetlanie 1-8 z 8
    Tytuł:
    EXAFS Determination of Bond Lengths in Zn$\text{}_{1-x}$Fe$\text{}_{x}$S Ternary Alloys
    Autorzy:
    Iwanowski, R. J.
    Ławniczak-Jabłońska, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1963384.pdf
    Data publikacji:
    1997-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.70.Dm
    Opis:
    Studies of local atomic structure in the zinc-blende Zn$\text{}_{1-x}$Fe$\text{}_{x}$S (x=0.11-0.50) diluted magnetic semiconductors with the use of the EXAFS technique are reported for the first time. They include the K-edge EXAFS measurements for both cationic elements (Zn, Fe). The experiment was carried out at room temperature in the transmission mode using synchrotron radiation of the DCI storage ring in Orsay, France. A detailed EXAFS analysis for different crystal compositions (x) gave a convincing evidence for a bimodal distribution of the nearest-neighbour interatomic distances in Zn$\text{}_{1-x}$Fe$\text{}_{x}$S within the iron solid-solubility limit. It has also revealed, within the accuracy of this method, constancy of both the nearest-neighbour cation-anion distances (i.e. Zn-S and Fe-S) in the composition range studied.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 4; 797-801
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Vacancy Formation in Fe-Al of B2 and $DO_3$ Alloys
    Autorzy:
    Kansy, J.
    Hanc, A.
    Giebel, D.
    Jabłońska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812532.pdf
    Data publikacji:
    2008-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.70.Bj
    71.55.Ak
    Opis:
    The positron lifetime spectroscopy is employed to study vacancy formation in intermetallic phases of $DO_3$ and B2 structures from Fe-Al system as a function of Al concentration, ternary additive (Cr) and their thermal treatment. Lifetime spectra were fitted en block by a simple trapping model encoded directly to the software (computer program LT-9). In the investigated range of Al concentration (28, 38, 42, and 45 at%) only two types of defects are found. In $DO_3$ region a single type of defects (characterized by positron lifetime $τ_1$=170±2 ps) is detected and indicated as vacancies in the Fe sublattice $(V_{Fe})$. In B2 region a small amount of an additional type of defects (characterized by positron lifetime $τ_2$=214±13 ps) appears. Supposedly, these are vacancies in Al sublattice $(V_{Al})$. For Fe28Al and Fe28Al5Cr samples changes in $V_{Fe}$ concentration are determined as a function of the sample composition, annealing time at 1000°C and quenching the samples to air and oil. The defect concentration increases with increase in Al content. For FeAl with Al above 38 at%, the total concentration of defects is so high that positrons are exclusively trapped by defects. Therefore the concentrations $V_{Al}$ and $V_{Fe}$ cannot be determined separately. However, the ratio of $V_{Al}$ concentration to $V_{Fe}$ concentration is estimated as a function of Al content.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 5; 1409-1415
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chemical Shifts at K-Absorption Edges of Transition Metals Admixed To ZnS and ZnSe
    Autorzy:
    Iwanowski, R. J.
    Ławniczak-Jabłońska, K.
    Traverse, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1963385.pdf
    Data publikacji:
    1997-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.70.Dm
    Opis:
    This paper gives the experimental evidence of systematic X-ray K-absorption edge studies in an effort to analyse the effect of cation chemical shift in the group of compounds type Zn$\text{}_{1-x}$M$\text{}_{x}$A (M = Mn, Fe, Co, Ni; A = S, Se). The observed chemical shift was found practically independent of the choice of anion, whereas it revealed a noticeable decrease when passing from Mn to Zn. The effect was ascribed to the change of the 3d shell occupation. The calculations of the effective cation charge (based on the theoretical approach of Kitamura and Chen, 1991) have shown that in the case of transition metals admixed to ZnS and ZnSe there is a contribution of the 3d electrons to the overall charge transfer, which indicates that the ability of 3d electrons to participate in predominantly ionic bond decreases with 3d orbit filling.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 4; 803-808
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of Mo-Ni Alloys by X-Ray Spectroscopies
    Autorzy:
    Ławniczak-Jabłońska, K.
    Heinonen, M.
    Inoue, J.
    Tohyama, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1924333.pdf
    Data publikacji:
    1993-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.Cf
    78.70.En
    79.60.-i
    Opis:
    Band structure investigations of the random MoNi$\text{}_{4}$ and MoNi$\text{}_{3}$ alloys, performed by emission and photoelectron spectroscopy, is reported. The X-ray emission and X-ray photoelectron spectra allowed to study the occupied valence band states below Fermi level. These techniques gave the full description of changes in the density of valence electron states distribution due to substitution of Mo atoms into the fcc Ni lattice up to 25 at%. The analysis of the emission and photoelectron spectra led to clear distinction between the changes in spectra caused by density of states structure and by additional effects involved in creation of the particular spectra. The experimental data are compared with the density of states calculated using coherent potential approximation and linear muffin-tin orbital methods.
    Źródło:
    Acta Physica Polonica A; 1993, 83, 1; 115-124
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Radial Distribution Function Analysis of Carbon Nanotubes
    Autorzy:
    Szczygielska, A.
    Jabłońska, A.
    Burian, A.
    Dore, J. C.
    Honkimaki, V.
    Nagy, J. B.
    Powiązania:
    https://bibliotekanauki.pl/articles/2014446.pdf
    Data publikacji:
    2000-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.10.-i
    81.05.Tp
    Opis:
    Wide-angle X-ray scattering studies of carbon nanotubes produced by catalytic decomposition of acetylene on a supported Co catalyst are reported. The X-ray intensities were recorded up to maximum scattering vector K$\text{}_{max}$=24Å and then Fourier transformed to real space. Yielding the radial distribution functions of good spatial resolution were analysed by the model based on fitting procedures method. Detailed analysis of the experimental data by a least-squares fitting procedure shows that the local atomic structure exhibits the expected hexagonal network with the nearest-neighbour C-C distance of 1.41Å. Investigation of stacking nature of subsequent layers suggests the structure in which adjacent layers are arranged without spatial correlations with inter-tubule spacing of about 3.4Å.
    Źródło:
    Acta Physica Polonica A; 2000, 98, 5; 611-617
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    X-Ray Photoelectron Spectroscopy and X-Ray Diffraction Studies of Zn$\text{}_{1-x}$Co$\text{}_{x}$S Diluted Magnetic Semiconductor Crystals
    Autorzy:
    Ławniczak-Jabłońska, K.
    Gołacki, Z.
    Paszkowicz, W.
    Iwanowski, R. J.
    Johansson, L.-S.
    Heinonen, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1861485.pdf
    Data publikacji:
    1993-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    79.60.-i
    71.20.Fi
    Opis:
    X-ray photoelectron spectroscopy and powder X-ray diffraction studies of diluted magnetic semiconducting alloys Zn_{1-x}Co_{x}S, in the composition range 0 ≤ x ≤ 0.18, were performed. The analysis of XPS spectra has shown that admixture of Co into ZnS lattice does not affect the shape and position of Zn 2p core level, whereas certain modification of the S 2p peak shape was observed. The detected binding energy of Co indicated similarity between Co-S and Co-O bond structure. Significant contributions of Co 3d^{7} electrons to the valence band density of states were revealed.
    Źródło:
    Acta Physica Polonica A; 1993, 84, 4; 633-636
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    XANES Studies of Mn K and $L_{3,2}$ Edges in the (Ga,Mn)As Layers Modified, by High Temperature Annealing
    Autorzy:
    Wolska, A.
    Lawniczak-Jablonska, K.
    Klepka, M.
    Jakieła, R.
    Demchenko, I.
    Sadowski, J.
    Holub-Krappe, E.
    Persson, A.
    Arvanitis, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812244.pdf
    Data publikacji:
    2008-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.70.Dm
    75.50.Pp
    Opis:
    $Ga_{1-x}Mn_xAs$ is commonly considered as a promising material for microelectronic applications utilizing the electron spin. One of the ways that allow increasing the Curie temperature above room temperature is to produce second phase inclusions. In this paper $Ga_{1-x}Mn_xAs$ samples containing precipitations of ferromagnetic MnAs are under consideration. We focus on the atomic and electronic structure around the Mn atoms relating to the cluster formation. The changes in the electronic structure of the Mn, Ga and As atoms in the (Ga,Mn)As layers after high temperature annealing were determined by X-ray absorption near edge spectroscopy. The experimental spectra were compared with the predictions of ab initio full multiple scattering theory using the FEFF 8.4 code. The nominal concentration of the Mn atoms in the investigated samples was 6% and 8%. We do not observe changes in the electronic structure of Ga and As introduced by the presence of the Mn atoms. We find, in contrast, considerable changes in the electronic structure around the Mn atoms. Moreover, for the first time it was possible to indicate the preferred interstitial positions of the Mn atoms.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 2; 357-366
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of Third Generation Synchrotron Source to Studies of Non-Crystalline Materials: In-Se Amorphous Films
    Autorzy:
    Burian, A.
    Jabłońska, A.
    Burian, A. M.
    Le Bolloc'h, D.
    Metzger, H.
    Proux, O.
    Hazemann, J. L.
    Mosset, A.
    Raoux, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2030649.pdf
    Data publikacji:
    2002-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.10.-i
    61.43.Dq
    Opis:
    The local structure of vacuum evaporated In-Se amorphous films, containing 50, 60, and 66 at.% Se, was studied using differential anomalous X-ray scattering and extended X-ray absorption fine structure. Both intensity and absorption spectra were measured in the vicinity of the absorption K-edge of Se. The differential anomalous X-ray scattering data were converted to real space by the inverse Fourier transform yielding the differential radial distribution functions. The obtained results provide evidence for the presence of Se-In spatial correlations for In$\text{}_{50}$Se$\text{}_{50}$ and Se-In and Se-Se correlations for In$\text{}_{40}$Se$\text{}_{60}$ and In$\text{}_{34}$Se$\text{}_{66}$ within the first coordination sphere.
    Źródło:
    Acta Physica Polonica A; 2002, 101, 5; 701-708
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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