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    Wyświetlanie 1-9 z 9
    Tytuł:
    The maximum entropy method in the analysis of the Mössbauer spectra
    Autorzy:
    Dobrzyński, L.
    Szymański, K.
    Satuła, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/147136.pdf
    Data publikacji:
    2004
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    Bayesian logic
    maximum entropy method
    Mössbauer spectra
    Opis:
    The paper shows the possibility of reconstruction of the distribution of hyperfine field parameters without prior assumptions concerning correlations between parameters. The method used is the maximum entropy method and the distributions considered concern the magnetic field and isomer shift. The results obtained are very encouraging and show the feasibility of the proposed method.
    Źródło:
    Nukleonika; 2004, 49,suppl.3; 89-93
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Maximum Entropy Method in Mössbauer Spectroscopy - a Problem of Magnetic Texture
    Autorzy:
    Satuła, D.
    Szymański, K.
    Dobrzyński, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1506656.pdf
    Data publikacji:
    2011-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.80.+y
    02.60.-x
    Opis:
    A reconstruction of the three dimensional distribution of the hyperfine magnetic field, isomer shift and texture parameter z from the Mössbauer spectra by the maximum entropy method is presented. The method was tested on the simulated spectrum consisting of two Gaussian hyperfine field distributions with different values of the texture parameters. It is shown that proper prior has to be chosen in order to arrive at the physically meaningful results.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 1; 78-80
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic texture determination by CEMS with polarized radiation
    Autorzy:
    Olszewski, K.
    Szymański, K.
    Satuła, D.
    Dobrzyński, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/148215.pdf
    Data publikacji:
    2007
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    magnetic texture
    CEMS
    polarized radiation
    Opis:
    CEMS measurements of a 57Fe foil were performed with unpolarized and polarized radiation. It is shown that the experimental results permit determination of important characteristics of a magnetic texture, an average square of the cosine((gamma-m)2) and an average cosine (gamma-m).
    Źródło:
    Nukleonika; 2007, 52, supl. 1; 17-19
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hyperfine fields in UFe5Sn compound
    Autorzy:
    Satuła, D.
    Szymański, K.
    Tran, V.
    Dobrzyński, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/148320.pdf
    Data publikacji:
    2007
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    Mössbauer studies
    uranium intermetallic
    magnetic intermetallic
    Opis:
    Local hyperfine interactions on Fe nuclei in UFe5Sn compound were determined in Mössbauer experiment. The analysis of the Mössbauer spectra measured at room temperature reveals the presence of two doublets only. Absorption line width indicates that neither distribution of quadrupole splitting nor isomer shift exists in the alloy. The measurements at 13 K show the presence of four magnetic components. Because the magnetic dipole and electric quadrupole interactions are present, full Hamiltonian was used to determine the hyperfine interactions for each iron site. Electric field gradient determined at low temperatures agrees with quadrupole splitting observed at room temperature. Absorption areas of the components at low and at high temperatures correspond well to the occupation of
    Źródło:
    Nukleonika; 2007, 52, supl. 1; 67-69
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of Bayesian Reasoning and the Maximum Entropy Method to Some Reconstruction Problems
    Autorzy:
    Fornalski, K.
    Parzych, G.
    Pylak, M.
    Satuła, D.
    Dobrzyński, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1537660.pdf
    Data publikacji:
    2010-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    29.85.-c
    78.70.Bj
    76.80.+y
    Opis:
    The so-called Bayesian reasoning is applied whenever uncertainty has to be considered as serious factor in interpretation of results. The paper presents analysis of the impact of inaccurate data on the straight line and quadratic relation fittings. This type of analysis is particularly important when one tries to decide on the type of dependence. The paper also shows examples of the Maximum Entropy Methods applied to the reconstruction of the hyperfine parameters distribution from the measured Mössbauer spectra of $GaFeO_{3}$ and the electron-positron momentum distribution from the positron annihilation data of Gd.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 6; 892-899
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mössbauer study of the Fe1-xNix Invar alloys by monochromatic circularly polarized source
    Autorzy:
    Satuła, D.
    Szymański, K.
    Dobrzyński, L.
    Rećko, K.
    Waliszewski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/148805.pdf
    Data publikacji:
    2003
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    Invar alloys
    Mössbauer polarimetry
    transition metal alloys
    Opis:
    X-ray diffraction measurements and Mössbauer spectroscopy with and without external magnetic field parallel to beam direction have been performed for Fe1-xNix (x = 0.25, 0.30, 0.35) alloys. The compositions of the studied alloys were chosen in order to cover the concentration range where the fcc - bcc structural transformation appears, as well as where single phase fcc Fe-Ni alloys exhibit the Invar phenomena. Spatial distribution of the iron magnetic moments is discussed. The hyperfine magnetic field (h.m.f.) distribution is analyzed within a scope of two models discussed in the literature. In the first model it is assumed that any hyperfine magnetic filed vector have the same spatial distribution (the same values of (). In the second, the low field component of the hyperfine magnetic field is ordered antiferomagnetically (or disordered) while the high field component is aligned by an external magnetic field. In order to determine the mean values of cosine of the angle between teta-rays direction and hyperfine field vector of iron, (), a monochromatic circularly polarized Mössbauer source (MCPMS) was used. The analysis of the MCPMS results show that the shapes of the measured spectra can be explained by single values of .
    Źródło:
    Nukleonika; 2003, 48,suppl.1; 71-74
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure and Magnetic Properties of Iron Oxide Nanoparticles Prepared by Wet Chemical Method
    Autorzy:
    Satuła, D.
    Kalska-Szostko, B.
    Szymański, K.
    Dobrzyński, L.
    Kozubowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811606.pdf
    Data publikacji:
    2008-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.80.+y
    61.46.Df
    75.75.+a
    Opis:
    The magnetic properties of iron oxide nanoparticles prepared by the chemical decomposition of the iron chlorides with the ratio $Fe^{3+}$/$Fe^{2+}$=2.25 were studied by means of transmission electron microscopy, X-ray diffraction and Mössbauer spectroscopy in- and without external magnetic field. The transmission electron microscopy studies show that the nanoparticles have spherical shape with diameter about 13 nm. The transmission electron microscopy and X-ray diffraction patterns are composed of lines that could be indexed within the cubic spinel structure. The room temperature Mössbauer spectrum shows the coexistence of the broad magnetically split part and superparamagnetic doublet. The in-field Mössbauer measurements carried out in the temperature range from room temperature down to 13 K show a gradual increase in the spin canting on the surface of the nanoparticles and decrease in the intensity of the superparamagnetic doublet. The sample was subjected to annealing process performed at elevated temperature in air atmosphere in order to change the microstructure of the nanoparticles and in consequence to change the magnetic properties of the sample. The annealing process leads to the decrease in the value of quadrupole splitting of the superparamagnetic doublets.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 6; 1615-1621
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mössbauer studies of single crystal gamma-Mn-Fe
    Autorzy:
    Szymański, K.
    Olszewski, W.
    Dobrzyński, L.
    Satuła, D.
    Jankowska-Kisielińska, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/147239.pdf
    Data publikacji:
    2004
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    gamma-Mn-Fe alloys
    iron alloys
    manganese alloys
    Mössbauer spectroscopy
    Opis:
    Mössbauer measurements were performed on single crystals gamma-Mn60Fe37Cu3 in an external field of 1.3 T at room temperature. The hyperfine field distribution can be described as a vector sum of the external and internal fields. In addition, anisotropic response of magnetic moments was detected. The anisotropy, due to Fe atoms, has Fe-rich surroundings.
    Źródło:
    Nukleonika; 2004, 49,suppl.3; 75-78
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Annealing in Multicomponent bcc Alloys
    Autorzy:
    Szymański, K.
    Perzyńska, K.
    Satuła, D.
    Dobrzyński, L.
    Zaleski, P.
    Waliszewski, J.
    Rećko, K.
    Biernacka, M.
    Olszewski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1506614.pdf
    Data publikacji:
    2011-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.Be
    76.80.+y
    61.05.Qr
    61.50.Ks
    81.30.Hd
    Opis:
    Multicomponent single phase alloys were synthesized according to the idea of iron-average atom system. X-ray diffraction shows formation of bcc phase and traces of unidentified phase. Mössbauer spectra indicate presence of two components with different hyperfine magnetic field distributions. The high field component corresponds to the majority ferromagnetic phase. Few per cent of iron builds low field component. The dominant effect of annealing consists in an increase of the low field component.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 1; 62-64
    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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