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High-temperature cation ordering in olivine: an in situ Mossbauer study of synthetic (Mg0.55Fe0.45)(2) SiO4
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
2008 (English)In: Hyperfine Interactions, ISSN 0304-3843, E-ISSN 1572-9540, Vol. 186, no 1-3, 99-103 p.Article in journal (Refereed) Published
Abstract [en]

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.
Keyword [en]
Mossbauer spectroscopy, Olivine, High-temperature, Cation-ordering
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:uu:diva-107032DOI: 10.1007/s10751-008-9838-yISI: 000261061900013OAI: oai:DiVA.org:uu-107032DiVA: diva2:227584
Available from: 2009-07-15 Created: 2009-07-15 Last updated: 2017-12-13Bibliographically approved

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