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

  • Christian Schmidt EMAIL logo and Martin A. Ziemann
Published/Copyright: March 25, 2015
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Abstract

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 (∂ν464/∂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 (ΔVT)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/∂P∂T) and (∂2FWHM206/∂P∂T)

Received: 1999-11-4
Accepted: 2000-7-27
Published Online: 2015-3-25
Published in Print: 2000-11-1

© 2015 by Walter de Gruyter Berlin/Boston

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