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Nanostructure of Amber Observed by Positronium Probes

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Idczak R., Sachanbiński M., Chojcan J., Konieczny R.
Acta Physica Polonica A
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2015
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vol. 128
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issue 1
64-66
EN
The nanostructure of several non-crystalline amber samples of different origin was investigated with positronium atoms. It was found that the volumes of the pores observed by positronium atoms are relatively small, not greater than about 0.25 nm³ for all studied samples. Moreover, the obtained data show that the nano-porous structure of amber may be associated with its age.
2
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An Enthalpy of Solution of Silicon in Iron Studied by ^{57}Fe Mössbauer Spectroscopy

100%
Idczak R., Konieczny R., Chojcan J.
Acta Physica Polonica A
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2016
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vol. 129
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issue 3
367-370
EN
The room temperature Mössbauer spectra of ^{57}Fe were measured for Fe_{1-x}Si_x solid solutions with x in the range 0.01 ≤ x ≤ 0.05. The obtained data were analysed in terms of the binding energy E_{b} between two silicon atoms in the studied materials using the extended Hrynkiewicz-Królas idea. The extrapolated value of E_{b} for x=0 was used to computation of an enthalpy of solution H_{FeSi} of Si in α-Fe matrix. It was found that the H_{FeSi} value is negative or Si atoms interact repulsively. The result was compared with corresponding values given in the literature which were derived from experimental calorimetric data as well as with the value resulting from the cellular atomic model of alloys by Miedema.
3
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An Enthalpy of Solution of Cobalt and Nickel in Iron Studied with ^{57}Fe Mössbauer Spectroscopy

100%
Idczak R., Konieczny R., Konieczna Ż., Chojcan J.
Acta Physica Polonica A
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2011
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vol. 119
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issue 1
37-40
EN
The room temperature Mössbauer spectra of ^{57}Fe were measured for iron-based solid solutions Fe_{1-x}Co_{x} and Fe_{1-x}Ni_{x} with x in the range 0.01 ≤ x ≤ 0.05. The obtained data were analysed in terms of the binding energy E_{b} between two Co or Ni atoms in the studied materials using the extended Hrynkiewicz-Królas idea. It was found that the energy is positive or the non-iron atoms interact repulsively. The extrapolated value of E_{b} for x=0 was used for computation of the enthalpy of solution of cobalt and nickel in iron. The results were compared with our previous Mössbauer spectroscopy findings, the values resulting from the Miedema's model of alloys and the data derived from the enthalpy of formation of the Fe-Co and Fe-Ni systems, obtained with calorimetric methods. The comparison shows that the present results are in a qualitative agreement with the Miedema's model predictions and calorimetric measurements but they are at variance with the previous Mössbauer spectroscopy findings.
4
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A Study of Thermodynamic Properties of Dilute Fe-Au Alloys by the ⁵⁷Fe Mössbauer Spectroscopy

100%
Konieczny R., Idczak R., Chojcan J.
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EN
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.
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