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    Wyświetlanie 1-9 z 9
    Tytuł:
    Model angular distribution functions in CA3, CA4 and CA6 structural units of glassy systems
    Autorzy:
    Bergmański, G.
    Feliziani, S.
    Rybicki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933172.pdf
    Data publikacji:
    2007
    Wydawca:
    Politechnika Gdańska
    Tematy:
    structure of matter
    disordered systems
    short-range order
    stochastic geometry
    Opis:
    We have calculated model partial angular distribution functions (pADFs) in CA3, CA4 and CA6 structural units, i. e. an equilateral triangle with three vertical anions, A, and a central cation, C, a regular tetrahedron with four vertical anions, A, and a central cation, C and a square bipyramid with six vertical anions, A, and a central cation, C. The model pADFs were calculated employing a simple Monte Carlo procedure: the ions were being shifted at random within 3D spheres of radius r with uniform probability density and the AAA, ACA and CAA angles were calculated for each random configuration. Repeating the calculation 10(8) - 10(9) times produced smooth probability densities for the angles' values. Conventional reference data so obtained can be applied to estimate the overall degree of deformation of the considered structural units in numerically simulated materials.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2007, 11, 3; 185-195
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Temperature dependence of the short-range order parameter for Fe0.90Cr0.10 and Fe0.88Cr0.12 alloys
    Autorzy:
    Idczak, R.
    Konieczny, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/147636.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    iron alloys
    Mössbauer spectroscopy
    nuclear materials
    short-range order
    Opis:
    The 57Fe Mössbauer spectra for the iron-based solid solutions Fe0.90Cr0.10 and Fe0.88Cr0.12 were measured at different temperatures ranging from 300 K to 900 K. Analysis of the obtained spectra shows that the distribution of impurity atoms in the two first coordination shells of 57Fe nuclei is not random and it cannot be described by the binomial distribution. Quantitatively, the effects were described in terms of the atomic short-range order (SRO) parameters and the pair-wise interaction energy with the help of a quasi-chemical type formulation introduced by Cohen and Fine. The obtained results reveal strong clustering-type correlations in the studied samples (a predominance of Fe-Fe and Cr-Cr bonds). Moreover, the changes in SRO values observed during thermal processing suggest that the distribution of Cr atoms in an α-iron matrix is strongly temperature dependent.
    Źródło:
    Nukleonika; 2015, 60, 1; 35-38
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermodynamic properties of Au-Fe alloys studied with 57Fe Mössbauer spectroscopy
    Autorzy:
    Idczak, R.
    Konieczny, R.
    Chojcan, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/147926.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    Mössbauer spectroscopy
    Au-Fe alloys
    enthalpy of solution
    short-range order
    Opis:
    The room temperature Mossbauer spectra of 57Fe were measured for Au1.xFex alloys with x in the range 0.01 less-than or equal to x less-than or equal to 0.03. The obtained data were analysed in terms of short range order parameter (SRO) and the binding energy Eb between two iron atoms in the studied materials using the extended Hrynkiewicz-Krolas idea. The estimated negative SRO parameters and the positive binding energy suggest ordering tendencies in Au-Fe alloys at low iron concentration. The extrapolated value of Eb for x = 0 was used for the computation of enthalpy of the solution of Fe in Au. The results were compared with the corresponding data derived from calorimetric measurements, previous Mossbauer experiments and resulting from the cellular atomic model of alloys by Miedema.
    Źródło:
    Nukleonika; 2013, 58, 1; 93-97
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A study of thermodynamic properties of dilute Fe-Au alloys by the ⁵⁷Fe Mössbauer spectroscopy
    Autorzy:
    Konieczny, R.
    Idczak, R.
    Chojcan, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1054974.pdf
    Data publikacji:
    2017-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    Mössbauer spectroscopy
    hyperfine parameters
    binding energy
    short-range order
    enthalpy of solution
    enthalpy of mixing
    binary alloys
    Opis:
    The room temperature Mössbauer spectra of ⁵⁷Fe were measured for Fe_{1-x}Au_x with the gold concentration ranging from 1 at.% till 4.8 at.%. They were analysed in terms of hyperfine parameters of their components related to unlike surroundings of the iron probes, determined by different numbers of gold atoms existing in the neighbourhood of iron atoms. Basing on the intensities of the spectrum components we determined binding energy E_b between two gold atoms in the studied materials. The latter was done for properly annealed samples using the extended Hrynkiewicz-Królas idea. It was found that the binding energy is positive or Au atoms interact repulsively. The extrapolated value of E_b for x =0 was used for computation of an enthalpy of solution of Au in Fe. Finally the obtained value of the enthalpy was used to predict the mixing enthalpy for the Fe-Au solid solutions. The results were compared with both the corresponding values resulting from the cellular atomic model of alloys by Miedema and those derived from experimental calorimetric data given in the literature.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 2; 255-258
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Atomic short-range order in mechanically synthesized iron based Fe-Zn alloys studied by 57Fe Mössbauer spectroscopy
    Autorzy:
    Konieczny, R.
    Idczak, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/148820.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    hyperfine interactions
    mechanical alloying
    Mössbauer spectroscopy
    nanocrystalline materials
    short-range order
    Opis:
    Mechanical alloying method was applied to prepare nanocrystalline iron-based Fe1-xZnx solid solutions with x in the range 0.01 ≤ x ≤ 0.05. The structural properties of the materials were investigated with the Mössbauer spectroscopy by measuring the room temperature spectra of 57Fe for as-obtained and annealed samples. The spectra were analyzed in terms of parameters of their components related to unlike surroundings of the iron probes, determined by different numbers of zinc atoms existing in the neighborhood of iron atoms. The obtained results gave clear evidence that after annealing process, the distribution of impurity atoms in the fi rst coordination spheres of 57Fe nuclei is not random and it cannot be described by binomial distribution. The estimated, positive values of the short-range order parameters suggest clustering tendencies of Zn atoms in the Fe-Zn alloys with low zinc concentration. The results were compared with corresponding data derived from Calphad calculation and resulting from the cellular atomic model of alloys by Miedema.
    Źródło:
    Nukleonika; 2015, 60, 1; 69-73
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermodynamic properties of dilute Co-Fe solid solutions studied by 57Fe Mössbauer spectroscopy
    Autorzy:
    Konieczny, R.
    Idczak, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/146524.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    Mössbauer spectroscopy
    binding energy
    short-range order
    enthalpy of solution
    enthalpy of mixing
    binary alloys
    Opis:
    The Co1–xFex alloys where x ranges from 0.01 to 0.06 were measured at room temperature using transmission Mössbauer spectroscopy (TMS). The analysis of the obtained data allowed the determination of the short-range order (SRO), the binding energy Eb between two iron atoms in the studied materials using the extended Hrynkiewicz-Królas idea and the enthalpy of solution HCo-Fe of Fe in Co. The results showed that the Fe atoms dissolved in a Co matrix interact repulsively and the estimated value of HCo-Fe = –0.166(33) eV/atom. Finally, values of the enthalpy of solution were used to predict the enthalpy of mixing for the Co-Fe system. These findings were compared with corresponding data given in the literature, which were derived from calorimetric experiments and from the cellular atomic model of alloys described by Miedema.
    Źródło:
    Nukleonika; 2017, 62, 2; 109-115
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The structure of clusters in liquid alloys of pseudo-binary PbTe-Bi2Te3 system
    Autorzy:
    Korolyshyn, A. V.
    Olyinyk, Z. M.
    Mudry, S. I.
    Powiązania:
    https://bibliotekanauki.pl/articles/378946.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    metallic alloy
    short-range order
    melt
    thermoelectric material
    stop metaliczny
    uporządkowanie bliskie
    wytop
    materiał termoelektryczny
    Opis:
    Purpose: of this paper is to study the structure of melts of quasi-binary system Bi2Te3-PbTe by means of X-ray diffraction method. The aim of the research was to investigate the short range order in melts comparing it with the structure in solid state. Design/methodology/approach: Analysis of the structural factors, radial distribution functions of atoms and basic structural parameters showed that the structure of melts at temperatures near the liquidus shows microheterogeneity. Findings: On the basis of the analysis of structural factors, functions of the radial distribution of atoms and basic structural parameters, it is shown that in the given concentration the short range order structure of liquid alloys of pseudo-binary PbTe-Bi2Te3 system is microinhomogeneous and is characterized by the presence of associates, whose atomic arrangement is like to the structure of solid compounds, existing in this concentration range. Research limitations/implications: To complete the understanding of short-range order effect on the formation of the physical properties of Pb-Bi-Te alloys, further studies of the thermoelectric properties of these alloys in the liquid state are needed. Practical implications: The promise of the considered direction requires an experimental and theoretical study of the processes of bulk, thin film and nanostructured material. In this case, it is necessary to develop a technology for the synthesis of compounds of Pb-Bi-Te system, obtaining thin films and nanostructures using the vapour phase methods with studying the mechanisms of thermoelectric properties of the material formation and optimization of technological regimes for obtaining effective thermoelectric materials based on compounds of Pb-Te-Bi system. Originality/value: The processes of structure formation of nanosystems with given characteristics are investigated, because among numerous thermoelectric materials, bismuth telluride (Bi2Te3) and its alloys are the most important thermoelectric materials used in state-of-the-art devices near room temperature, and lead telluride (PbTe)-based alloys are extensively used in power supplies for space exploration and generators for use at medium to high temperatures.
    Źródło:
    Archives of Materials Science and Engineering; 2019, 100, 1/2; 5-12
    1897-2764
    Pojawia się w:
    Archives of Materials Science and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural disordering in Sn-Pb(Bi) eutectic melts induced by heating
    Autorzy:
    Mudry, S.
    Shtablavyi, I.
    Shevernoga, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/779777.pdf
    Data publikacji:
    2013
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    liquid alloys
    chemical bonding in eutectic alloys
    chemical short-range order
    Opis:
    The structure of liquid Sn0.739Pb0.261 and Sn0.57Bi0.43 eutectic alloys was studied by means of X-ray diffraction at several temperatures. Structure factors, pair correlation functions and the main structural parameters obtained on their basis were analyzed. We show that the structure of the Sn0.739Pb0.261 and Sn0.57Bi0.43 eutectic alloys is inhomogeneous and consists of different types of clusters. Upon heating the cluster structure undergoes topological and chemical disordering showing a significant dependence of structural parameters on temperature near the melting point.
    Źródło:
    Polish Journal of Chemical Technology; 2013, 15, 3; 61-64
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Liquid-solid interaction during formation of nanocomposite systems
    Autorzy:
    Shtablavyi, I.
    Mudry, S.
    Kajak, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/779001.pdf
    Data publikacji:
    2012
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    composite materials
    liquid metals and alloys
    metallic powders
    microstructure
    short-range order
    Opis:
    Structural changes in mixtures of liquid Bi with small Cu and Ni particles were studied at temperatur es of 615 and 1145K. Microstructures of the composites were observed (SEM) and analyzed after treatment at different temperatures and various durations of stirring. The structure of the mixtures of Bi with Cu(Ni) particles was investigated by means of X-ray diffraction, both in the solid and liquid state.
    Źródło:
    Polish Journal of Chemical Technology; 2012, 14, 4; 42-45
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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