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    Wyświetlanie 1-9 z 9
    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:
    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:
    Working parameters of the electron - beam-generated ion source for ISOL facilities
    Autorzy:
    Yushkevich, Y. V.
    Turek, M.
    Mączka, D.
    Pyszniak, K.
    Słowiński, B.
    Vaganov, Y. A.
    Zubrzycki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/146648.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    on-line isotope separation
    short-lived nuclides
    nuclear spectroscopy
    ion sources
    Opis:
    An electron-beam generated plasma (EBGP) ion source for nuclear spectroscopy purposes at YASNAPP (YAdernaya Spektroskopya NA Putchkah Protonov - nuclear spectroscopy using proton beams) isotope separation on-line facility is presented. Working conditions both in on- and off-line mode are presented and discussed. Formation of a potential trap inside a discharge chamber is an advantage of the presented construction, enabling relatively high ionization efficiencies (2-5%) even for hard-to-ionize elements like Be, Ti, V, Zr, Nb, Mo, Tc, Ru, Rd, Hf, Ta, W, Re, Os, Ir, Pt. The paper presents estimation of critical values of working parameters that enable formation of the ion trap leading in consequence to high efficiency of ionization. The optimal temperature of the discharge chamber and cathode walls is found to be in the range 2600-2800 K. Calculations of the output rates of ions produced in the on-line mode are also presented as well as the constraints on the half-life time of obtained nuclides imposed by construction details like the target material and its thickness.
    Źródło:
    Nukleonika; 2012, 57, 3; 351-356
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Control of the propagation of intense laser pulses in gas for laser plasma acceleration
    Autorzy:
    Giulietti, D.
    Cecchetti, C. A.
    Drenska, N. V.
    Faccini, N.
    Gatti, C.
    Gatti, G.
    Giulietti, A.
    Gizzi, L.
    Labate, L.
    Levato, T.
    Martellotti, S.
    Pathak, N.
    Valente, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/147890.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    intense laser pulses
    ultra-short laser pulse
    laser plasma
    plasma acceleration
    Opis:
    The role of the propagation mechanisms of intense and ultra-short laser pulses in gas is presented, as well as the first results of the laser plasma acceleration (LPA) tests at Frascati National Laboratories (INFN), in the frame of NTA-PLASMONX project.
    Źródło:
    Nukleonika; 2012, 57, 2; 221-225
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Elucidation of reaction mechanisms using kinetic isotope effects of short-lived radionuclides
    Autorzy:
    Matsson, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/146955.pdf
    Data publikacji:
    2002
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    carbon-11
    fluorine-18
    kinetic isotope effect
    reaction mechanism
    short-lived radionuclide
    Opis:
    The use of the short-lived radionuclides 11C and 18F for the elucidation of organic reaction mechanisms is described. Examples of the different mechanistic problems that are discussed include concerted vs. stepwise base catalysed elimination (E2 or E1cB) and finding the rate limiting step for nucleophilic aromatic substitution (SNAr). The use of radionuclides to learn details about transition state structure for concerted nucleophilic aliphatic substitution (SN2) is also described.
    Źródło:
    Nukleonika; 2002, 47,suppl.1; 43-45
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ponderomotive self-focusing of a short laser pulse under a plasma density ramp
    Autorzy:
    Kant, N.
    Saralch, S.
    Singh, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/146636.pdf
    Data publikacji:
    2011
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    self-focusing
    underdense plasma
    plasma density ramp
    ponderomotive force
    short laser pulse
    Gaussian beam
    Opis:
    The ponderomotive self-focusing of a short laser pulse in an underdense plasma under a plasma density ramp is analyzed. The pulse may acquire a minimum spot size due to the ponderomotive self-focusing. Beyond the focus, the nonlinear refraction starts weakening, and the spot size of the laser pulse increases, resulting in an oscillatory self-focusing and defocusing behavior of the beam with the propagation distance. In order to minimize the defocusing, we introduce a localized upward plasma density ramp. Due to the upward plasma density ramp, the laser beam retains a minimum spot size. Self-focusing becomes stronger with a mild ripple as the propagation distance increases. The conditions for the ponderomotive self-focusing for suitable parameters of the laser beam and the plasma are determined. The plasma density ramp of the considered type may be observed in gas jet plasma experiments.
    Źródło:
    Nukleonika; 2011, 56, 2; 149-153
    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:
    Experimental results on advanced inertial fusion schemes obtained within the HiPER project
    Autorzy:
    Batani, D.
    Gizzi, L. A.
    Koester, P.
    Labate, L.
    Honrubia, J.
    Antonelli, L.
    Morace, A.
    Volpe, L.
    Santos, J. J.
    Schurtz, G.
    Hulin, S.
    Ribeyre, X.
    Nicolai, P.
    Vauzour, B.
    Dorchies, F.
    Nazarov, W.
    Pasley, J.
    Richetta, M.
    Lancaster, K.
    Spindloe, Ch.
    Tolley, M.
    Neely, D.
    Kozlová, M.
    Nejdl, J.
    Rus, B.
    Wołowski, J.
    Badziak, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/147696.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    advanced ignition schemes
    fast ignition
    shock ignition
    inertial fusion
    propagation of fast electrons
    short-pulse ultra-high-intensity laser
    shock compressed matter
    cylindrical implosions
    Opis:
    This paper presents the results of experiments conducted within the Work Package 10 (fusion experimental programme) of the HiPER project. The aim of these experiments was to study the physics relevant for advanced ignition schemes for inertial confinement fusion, i.e. the fast ignition and the shock ignition. Such schemes allow to achieve a higher fusion gain compared to the indirect drive approach adopted in the National Ignition Facility in United States, which is important for the future inertial fusion energy reactors and for realising the inertial fusion with smaller facilities.
    Źródło:
    Nukleonika; 2012, 57, 1; 3-10
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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