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- W2000403724 abstract "Stishovite (SiO 2 with the rutile structure and octahedrally coordinated silicon) is an important high-pressure mineral. It has previously been considered to be essentially anhydrous. In this study, hydrothermal treatment of silica glass and coesite at 350–550 °C near 10 GPa produces stishovite with significant amounts of H 2 O in its structure. A combination of methodologies (X-ray diffraction, thermal analysis, oxide melt solution calorimetry, secondary ion mass spectrometry, infrared and nuclear magnetic resonance spectroscopy) indicate the presence of 1.3 ± 0.2 wt % H 2 O and NMR suggests that the primary mechanism for the H 2 O uptake is a direct hydrogarnet-like substitution of 4H + for Si 4+ , with the protons clustered as hydroxyls around a silicon vacancy. This substitution is accompanied by a substantial volume decrease for the system (SiO 2 + H 2 O), although the stishovite expands slightly, and it is only slightly unfavorable in energy. Stishovite could thus be a host for H 2 O at convergent plate boundaries, and in other relatively cool high-pressure environments." @default.
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- W2000403724 date "2011-12-12" @default.
- W2000403724 modified "2023-10-11" @default.
- W2000403724 title "Ultrahydrous stishovite from high-pressure hydrothermal treatment of SiO<sub>2</sub>" @default.
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- W2000403724 doi "https://doi.org/10.1073/pnas.1117152108" @default.
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