MOSSBAUER AND ELNES SPECTROSCOPY OF (MG,FE)(SI,AL)O3 PEROVSKITE: A HIGHLY OXIDISED COMPONENT OF THE LOWER MANTLE
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dc.contributor.author | Lauterbach S. | |
dc.contributor.author | McCammon C.A. | |
dc.contributor.author | van Aken P. | |
dc.contributor.author | Langenhorst F. | |
dc.contributor.author | Seifert F. | |
dc.date.accessioned | 2021-01-25T02:42:44Z | |
dc.date.available | 2021-01-25T02:42:44Z | |
dc.date.issued | 2000 | |
dc.identifier | https://elibrary.ru/item.asp?id=984759 | |
dc.identifier.citation | Contributions to Mineralogy and Petrology, 2000, 138, 1, 0017-0026 | |
dc.identifier.issn | 0010-7999 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/23733 | |
dc.description.abstract | (Mg,Fe)(Si,Al)O3 perovskite samples with varying Fe and Al concentration were synthesised at high pressure and temperature at varying conditions of oxygen fugacity using a multianvil press, and were characterised using ex situ X-ray diffraction, electron microprobe, Mossbauer spectroscopy and analytical transmission electron microscopy. The Fe3+/ΣFe ratio was determined from Mossbauer spectra recorded at 293 and 80 K, and shows a nearly linear dependence of Fe3+/ΣFe with Al composition of (Mg,Fe)(Si,Al)O3 perovskite. The Fe3+/ΣFe values were obtained for selected samples of (Mg,Fe)(Si,Al)O3 perovskite using electron energy-loss near-edge structure (ELNES) spectroscopy, and are in excellent agreement with Mossbauer data, demonstrating that Fe3+/ΣFe can be determined with a spatial resolution on the order of nm. Oxygen concentrations were determined by combining bulk chemical data with Fe3+/ΣFe data determined by Mossbauer spectroscopy, and show a significant concentration of oxygen vacancies in (Mg,Fe)(Si,Al)O3 perovskite. | |
dc.title | MOSSBAUER AND ELNES SPECTROSCOPY OF (MG,FE)(SI,AL)O3 PEROVSKITE: A HIGHLY OXIDISED COMPONENT OF THE LOWER MANTLE | |
dc.type | Статья |
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