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- W2007649870 abstract "Raman spectra of the two high-pressure polymorphs of SiO2 (coesite and stishovite) were investigated in the temperature range 105–875 K at atmospheric pressure. Coesite remained intact after the highest temperature run, but stishovite became amorphous at temperatures above about 842∼872 K. Most Raman modes exhibit a negative frequency shift with temperature for these polymorphs, but positive trends were also observed for some modes. Except for some weak modes, nonlinear temperature variation were established for these polymorphs within the experimental uncertainty and temperature range spanned. The slopes of the variation (δvi/δT)P for these polymorphs were compared with the published values. When compared with quartz and stishovite, the four-membered rings of SiO4-tetrahedra in coesite exhibit very little change with both temperature and pressure. It is also suggested that temperature and pressure should have opposite effects on the Raman shift of each vibrational mode." @default.
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- W2007649870 date "1994-01-01" @default.
- W2007649870 modified "2023-10-06" @default.
- W2007649870 title "Raman Spectra of High-Pressure Polymorphs of MgSiO3 at Various Temperatures." @default.
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- W2007649870 doi "https://doi.org/10.4294/jpe1952.42.411" @default.
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