On protons, iron and the high‐pressure behavior of ringwoodite
Authors:
- 7 November 2002
- journal article
- Published by American Geophysical Union (AGU) in Geophysical Research Letters
- Vol. 29 (21) , 17-1-17-4
Abstract
Raman spectra of a single crystal of hydrous Fo89‐ringwoodite have been measured in a diamond‐anvil cell at room temperature to 60 GPa. Strong peaks corresponding to asymmetric and symmetric stretching vibrations of the SiO4 tetrahedra are observed at 796 and 841 cm−1 respectively. Additional bands occur in the range 709–939 and 100–250 cm−1. The SiO4 stretching modes of the spinel structure shift continuously up to 60 GPa. Near 40 GPa new Raman bands emerge in the region 550–680 cm−1 gaining intensity to the maximum pressure, a change that is reversible on pressure release. This pressure‐induced modification in the structure appears to be related to structural complexity generated by both Fe and proton substitution.Keywords
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