Temat: nuclear spectroscopy - Katalog OPAC zbiorów

Skocz do pozycji: 1.

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

Skocz do pozycji: 2.

Tytuł:: Mössbauer spectroscopy study of 60P2O5-40Fe2O3 glass
Autorzy:: Stoch, P.
Ciecińska, M.
Zachariasz, P.
Suwalski, J.
Górski, L.
Wójcik, T.
Powiązania:: https://bibliotekanauki.pl/articles/147350.pdf
Data publikacji:: 2013
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: iron phosphate glass
Mössbauer spectroscopy
nuclear waste
waste glass
Opis:: A 57Fe Mössbauer spectroscopy study is presented. The main goal of the research was to investigate the structural information of the glass-like the coordination numbers and redox ratio of the iron. Most of the iron, about 80%, is present in the glass as Fe3+, which is composed of tetrahedral (57%) and octahedral (23%) coordinated iron. The rest of the iron, about 20%, is in the oxidation state Fe2+. This iron could be mostly present as VIFe2+, but five-fold coordinated iron is also possible. Finally, the structural model of the synthesized 60P2O5-40Fe2O3 glass was proposed.
Źródło:: Nukleonika; 2013, 58, 1; 63-66
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Mössbauer spectroscopy study of 60P2O5-40Fe2O3 glass crystallization
Autorzy:: Stoch, P.
Stoch, A.
Powiązania:: https://bibliotekanauki.pl/articles/146169.pdf
Data publikacji:: 2015
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: crystallization
iron phosphate glass
Mössbauer spectroscopy
nuclear waste
waste glass
Opis:: 60P2O5-40Fe2O3 glass was synthesized and 57Fe Mössbauer spectroscopy study was presented. The main goal of the research was to investigate structural changes of local environment of iron ions during gradual crystallization of the glass. It was observed that some changes were evidenced at temperature of heat treatment higher than 400°C, above which content of tetrahedrally coordinated Fe3+ was increased in cost of octahedral sites. This led to formation of areas of nucleation of α-FePO4. Crystallization of α-Fe3(P2O7)2 and Fe2P2O7 was also observed.
Źródło:: Nukleonika; 2015, 60, 1; 133-136
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

Artykuł

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