In situ structural changes of amorphous diopside (CaMgSi2O6) up to 20 GPa: A Raman and O K-edge X-ray Raman spectroscopic study
Moulton BJA, Henderson GS, Fukui H, Hiraoka N, de Ligny D, Sonneville C, Kanzaki M (2016)
Publication Status: Published
Publication Type: Journal article, Original article
Publication year: 2016
Journal
Publisher: Meteoritical Society
Book Volume: 178
Pages Range: 41-61
DOI: 10.1016/j.gca.2016.01.020
Abstract
XRS measurements at the O K-edge suggest that Si-[5] is formed by 3 GPa. This formation is accompanied by a rapid decrease in the /Si-O-Si and a decrease in Q(0) species. A linear increase in the geometric mean of the high frequency envelope, the chi(b) value, from 999 to 1018 cm(-1) suggests that the conversion of NBO to BO is continuous up to 14 GPa. Above 14 GPa, the Raman spectra show an obvious negative shift in both, the high frequency peak maximum, and the chi(b) position. Simultaneously, the low frequency envelope looses its asymmetry at 14 GPa. This may be explained by either a loss of a vibrational mode in the range 1000-1200 cm(-1) and/or the formation of Si-[6]. The structural evolution of CaMgSi2O6 correlates well with a major change in the compressibility and diffusivity around 5 GPa. (C) 2016 Elsevier Ltd. All rights reserved.
Authors with CRIS profile
Involved external institutions
Okayama University / 岡山大学
Japan (JP)
Université Claude Bernard Lyon 1 (UCB)
France (FR)
National Synchrotron Radiation Research Center (NSRRC)
Taiwan (TW)
University of Hyogo / 兵庫県立大学
Germany (DE)
University of Toronto
Canada (CA)
Japan (JP)
Université Claude Bernard Lyon 1 (UCB)
France (FR)
National Synchrotron Radiation Research Center (NSRRC)
Taiwan (TW)
University of Hyogo / 兵庫県立大学
Germany (DE)
University of Toronto
Canada (CA)
How to cite
APA:
Moulton, B.J.A., Henderson, G.S., Fukui, H., Hiraoka, N., de Ligny, D., Sonneville, C., & Kanzaki, M. (2016). In situ structural changes of amorphous diopside (CaMgSi2O6) up to 20 GPa: A Raman and O K-edge X-ray Raman spectroscopic study. Geochimica Et Cosmochimica Acta, 178, 41-61. https://doi.org/10.1016/j.gca.2016.01.020
MLA:
Moulton, Benjamin J. A., et al. "In situ structural changes of amorphous diopside (CaMgSi2O6) up to 20 GPa: A Raman and O K-edge X-ray Raman spectroscopic study." Geochimica Et Cosmochimica Acta 178 (2016): 41-61.
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