Toroidal diamond anvil cell for detailed measurements under extreme static pressures

Agnès Dewaele (), Paul Loubeyre (), Florent Occelli, Olivier Marie and Mohamed Mezouar
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Agnès Dewaele: CEA, DAM, DIF
Paul Loubeyre: CEA, DAM, DIF
Florent Occelli: CEA, DAM, DIF
Olivier Marie: CEA, DAM, DIF
Mohamed Mezouar: ESRF, BP220

Nature Communications, 2018, vol. 9, issue 1, 1-9

Abstract: Abstract Over the past 60 years, the diamond anvil cell (DAC) has been developed into a widespread high static pressure device. The adaptation of laboratory and synchrotron analytical techniques to DAC enables a detailed exploration in the 100 GPa range. The strain of the anvils under high load explains the 400 GPa limit of the conventional DAC. Here we show a toroidal shape for a diamond anvil tip that enables to extend the DAC use toward the terapascal pressure range. The toroidal-DAC keeps the assets for a complete, reproducible, and accurate characterization of materials, from solids to gases. Raman signal from the diamond anvil or X-ray signal from the rhenium gasket allow measurement of pressure. Here, the equations of state of gold, aluminum, and argon are measured with X-ray diffraction. The data are compared with recent measurements under similar conditions by two other approaches, the double-stage DAC and the dynamic ramp compression.

Date: 2018
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DOI: 10.1038/s41467-018-05294-2

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