- Tytuł:
- 57Fe Mössbauer spectroscopy of annealed metamict davidite
- Autorzy:
-
Malczewski, D.
Frąckowiak, J.
Galuskin, E. - Powiązania:
- https://bibliotekanauki.pl/articles/148337.pdf
- Data publikacji:
- 2007
- Wydawca:
- Instytut Chemii i Techniki Jądrowej
- Tematy:
-
davidite
metamict minerals
recrystallization
Mössbauer spectroscopy - Opis:
- This paper reports preliminary results of 57Fe Mössbauer spectroscopy and X-ray diffraction (XRD) studies of metamict davidite samples (La,Ce,Ca,Th)(Y,U,Fe)(Ti,Fe,Mn)20(O,OH)38 after high temperature annealing in an argon atmosphere. The Mössbauer spectra show a gradual decrease of quadrupole splitting and line width values of an Fe3+ doublet with increasing annealing temperature. Rather unexpected feature of these spectra for an Fe2+ doublet is a considerable increase of the line width with progressive crystallinity and a simultaneous decrease of both quadrupole splitting and isomer shift values. Changes of the hyperfine parameters as a function of the annealing temperature appeared as sensitive indicators of the thermal recrystallization process of metamict davidite similar to metamict silicates.
- Źródło:
-
Nukleonika; 2007, 52, supl. 1; 81-84
0029-5922
1508-5791 - Pojawia się w:
- Nukleonika
- Dostawca treści:
- Biblioteka Nauki
Artykuł