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Wyszukujesz frazę "short-range order" wg kryterium: Temat


Wyświetlanie 1-5 z 5
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:
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:
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
    Wyświetlanie 1-5 z 5

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