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On protons, iron and the high‐pressure behavior of ringwoodite
Author(s) -
Kleppe Annette K.,
Jephcoat Andrew P.,
Smyth Joseph R.,
Frost Daniel J.
Publication year - 2002
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2002gl015276
Subject(s) - ringwoodite , raman spectroscopy , spinel , diamond anvil cell , materials science , proton , crystal structure , crystal (programming language) , analytical chemistry (journal) , high pressure , mineralogy , crystallography , geology , olivine , chemistry , optics , thermodynamics , metallurgy , physics , chromatography , quantum mechanics , programming language , computer science
Raman spectra of a single crystal of hydrous Fo 89 ‐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 SiO 4 tetrahedra are observed at 796 and 841 cm −1 respectively. Additional bands occur in the range 709–939 and 100–250 cm −1 . The SiO 4 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.