The use of 13C diamond as pressure and temperature sensor for diamond anvil cell experiments
Résumé
This study aims at providing an accurate method to determine in situ the pressure in the sample chamber during a diamond-anvil-cell experiment. We report the calibration of the frequency shift with pressure of the Raman band of a 98.3 at.% 13C diamond against ruby and SrB4O7:Sm2+. This method is suitable for the study of geological fluids during hydrothermal experiments performed at pressures up to 16 GPa and temperature up to 800°C, particularly for subduction-zone processes involving fluids or/and silicate melts. Experiments were carried out in a new hydrothermal diamond-anvil cell (HDAC) designed for the study of geological fluids at crustal and mantle pressures.