In situ structural changes of amorphous diopside (CaMgSi2O6) up to 20 GPa: A Raman and O K-edge X-ray Raman spectroscopic study

Beitrag in einer Fachzeitschrift
(Originalarbeit)


Details zur Publikation

Autorinnen und Autoren: Moulton BJA, Henderson GS, Fukui H, Hiraoka N, de Ligny D, Sonneville C, Kanzaki M
Zeitschrift: Geochimica Et Cosmochimica Acta
Verlag: Meteoritical Society
Jahr der Veröffentlichung: 2016
Band: 178
Seitenbereich: 41-61
ISSN: 0016-7037


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.


FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

de Ligny, Dominique Prof. Dr.
Professur für Werkstoffwissenschaften (Glas und Keramik)


Einrichtungen weiterer Autorinnen und Autoren

National Synchrotron Radiation Research Center (NSRRC)
Okayama University / 岡山大学 Okayama daigaku
Université Claude Bernard Lyon 1 (UCB)
University of Hyogo
University of Toronto


Zitierweisen

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://dx.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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