http://hdl.handle.net/20.500.12128/14671
Tytuł: | 57Fe Mossbauer spectroscopy of annealed metamict davidite |
Autor: | Malczewski, Dariusz Frąckowiak, Janusz Galuskin, Evgeny |
Słowa kluczowe: | davidite; metamict minerals; recrystallization; Mössbauer spectroscopy |
Data wydania: | 2007 |
Źródło: | Nukleonika, Vol. 52, supl. 1 (2007), s. 81-84 |
Abstrakt: | 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. |
URI: | http://hdl.handle.net/20.500.12128/14671 |
ISSN: | 1508-5791 0029-5922 |
Pojawia się w kolekcji: | Artykuły (WNP) |
Plik | Opis | Rozmiar | Format | |
---|---|---|---|---|
Malczewski_57_Fe_Mossbauer_spectroscopy.pdf | 270,57 kB | Adobe PDF | Przejrzyj / Otwórz |
Uznanie autorstwa - użycie niekomercyjne, bez utworów zależnych 3.0 Polska Creative Commons