Deviatoric stress in a quasi-hydrostatic diamond anvil cell - Effect on the volume-based pressure calibration

Details Deviatoric stress in a quasi-hydrostatic diamond anvil cell - Effect on the volume-based pressure calibration Deviatoric stress in a quasi-hydrostatic diamond anvil cell - Effect on the volume-based pressure calibration

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20.1147m&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 12, p. 1147-1150.

Physics

52

Hydrostatic Pressure, Instrument Compensation, Pressure Measurement, Static Pressure, Stress Analysis, Anvils, Ethyl Alcohol, Methyl Alcohol, Water

Scientific paper

The deviatoric stress in gold as a function of pressure and temperature, in a diamond anvil cell with neon as the pressure medium, is measured based on gold diffraction peaks. We find that the deviatoric stress becomes detectable at a pressure of about 15 GPa and reaches 0.62 GPa by 30 GPa. Upon heating, the deviatoric stress decreases rapidly and disappears at a temperature of about 650 K. The effect of deviatoric stress on the unit cell volume measurement and further on the volume-based pressure calibration is directly proportional to K/mu of the measured material, and it is also related to the anisotropy, as well as the sign of the deviatoric stress and the orientation of the X-ray diffraction. We find that the measured unit cell volume of gold is very sensitive to the deviatoric stress due to a high value of K/mu. Although the observed deviatoric stress may be insignificant for most samples, it causes a significant systematic error on the pressure calibration based on the unit cell volume of gold.

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