On protons, iron and the high-pressure behavior of ringwoodite

Details On protons, iron and the high-pressure behavior of ringwoodite On protons, iron and the high-pressure behavior of ringwoodite

Nov 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29u..17k&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 21, pp. 17-1, CiteID 2021, DOI 10.1029/2002GL015276

Physics

7

Mineral Physics: High-Pressure Behavior, Mineral Physics: Optical, Infrared, And Raman Spectroscopy, Mineralogy, Petrology, And Mineral Physics: Experimental Mineralogy And Petrology

Scientific paper

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.

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