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Raman scattering of rhenium for secondary pressure calibration

Journal Article · · Journal of Applied Physics
DOI:https://doi.org/10.1063/5.0268317· OSTI ID:2567098

With the increasing number of 100 s GPa experiments in the diamond anvil cell (DAC), improved accuracy in secondary pressure calibrations to extreme pressures is essential. The rhenium equation of state has been proposed as a pressure calibrant via x-ray diffraction with potentially broad applications as it is commonly used as a gasket material in DAC experiments. In this work, we conducted Raman spectroscopy experiments on rhenium in the DAC and report the pressure shift of the E2g mode, a refined high-pressure C44 and mode-Grüneisen parameter above 200 GPa. We used flat, beveled, and toroidal diamond anvils under quasi-hydrostatic and non-hydrostatic conditions. By measuring the E2g mode from the culet edge to the center, we analyzed pressure distribution based on culet type and distance from the anvil center. The shift in the E2g mode can be expressed as a function of pressure, and diamond edge measurements appear reliable across all anvil types. Comparing the center and edge pressures reveals anvil cupping, offering insights into predicting or preventing anvil failure during materials properties measurements at extreme conditions.

Sponsoring Organization:
USDOE
Grant/Contract Number:
NONE; NA0003975; AC52-07NA27344
OSTI ID:
2567098
Alternate ID(s):
OSTI ID: 2585313
Journal Information:
Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 19 Vol. 137; ISSN 0021-8979
Publisher:
American Institute of PhysicsCopyright Statement
Country of Publication:
United States
Language:
English

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