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In-situ Raman spectroscopy of quartz: A pressure sensor for hydrothermal diamond-anvil cell experiments at elevated temperatures

GeoForschungsZentrum Potsdam, Telegrafenberg D329, Potsdam 14473, Germany

Correspondence: ^* E-mail: hokie{at}gfz-potsdam.de

Changes in frequency and linewidth of the 206 and 464 cm^–1 A₁ Raman modes of quartz were determined over temperatures from 23 to 800 °C and simultaneously at pressures ranging between 0.1 MPa and 2.1 GPa using a hydrothermal diamond-anvil cell (HDAC). The frequency shift of the 464 cm^–1 peak can be used as a secondary pressure standard for SiO₂-saturated systems in HDAC experiments at temperatures up to 560 °C. The frequency of this peak depends quasilinearly on pressure in the studied pressure range. The global slope (₄₆₄/P)_T is 9 ± 0.5 cm^–1/GPa. A significant variation of this slope with temperature was not observed. Including literature data, the temperature induced frequency shift of the 464 cm^–1 mode is described by (_T)_{464,P = 0.1 MPa} (cm^–1) = 2.50136·10^–11 ·T⁴ + 1.46454·10^–8·T³ – 1.801·10^–5·T² – 0.01216·T + 0.29 where –196 T (°C) 560. The pressure dependence of the linewidth of the 464 cm^–1 line increases with temperature. The frequency shifts and linewidths for the 206 cm^–1 mode indicate that this line can be used as an alternative to the ruby fluorescence technique as a pressure sensor to about 5 GPa for experiments at room temperature. Both the frequency and linewidth of this mode show significant cross-derivatives (²v₂₀₆/PT) and (²FWHM₂₀₆/PT).

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