High-temperature cation ordering in olivine: an in situ Mossbauer study of synthetic (Mg0.55Fe0.45)(2) SiO4
2008 (English)In: Hyperfine Interactions, ISSN 0304-3843, Vol. 186, no 1-3, 99-103 p.Article in journal (Refereed) Published
High- temperature in situ Mossbauer spectroscopy measurements ( 300 950. C) were done on synthetic olivine of composition ( Mg0.55Fe0.45) 2 SiO4 (= Fa45) in order to study the distribution of Fe2+ over the M1 and M2 octahedral sites. The spectra are fit with two doublets, which are assigned to Fe2+ at the M1 ( smaller splitting) and M2 sites. The Fe2+ site- occupancies at M1 and M2, obtained from the Mossbauer relative areas, suggest that Fe2+ has a slight preference for the M1 site at temperatures below similar to 500. C, with a tendency of disordering around this temperature. At higher temperatures, Fe2+ again prefers to occupy the M1 site, where it shows a considerable order at this site up to 750C. At still higher temperatures, the spectra indicated partial reduction of the Fa- component into metallic iron and the resolution of the doublets was severely deteriorated.
Place, publisher, year, edition, pages
2008. Vol. 186, no 1-3, 99-103 p.
Mossbauer spectroscopy, Olivine, High-temperature, Cation-ordering
Earth and Related Environmental Sciences
IdentifiersURN: urn:nbn:se:uu:diva-107032DOI: 10.1007/s10751-008-9838-yISI: 000261061900013OAI: oai:DiVA.org:uu-107032DiVA: diva2:227584