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Simultaneous compression of NaCl, Au, and ruby: toward mutually consistent pressure scales

Journal Article · · High Pressure Research
 [1];  [2];  [2]
  1. UChicago, LLC., Argonne, IL (United States)
  2. Argonne National Laboratory (ANL), Argonne, IL (United States)

Here, we evaluate pressure consistency of equations of state (EOS) for NaCl and Au at 300 K. The simultaneous measurements of unit-cell volumes (V) with ruby R1 line shifts (Δλ) in a helium (He) loaded diamond cell effectively remove potential systematic errors. Compression and decompression data were automatically collected at 1 sec interval, yielding a dense dataset with >8,000 (V, Δλ) pairs each for NaCl and Au. Solidification of He has noticeable effects on both V and Delta lambda (hence P). Only data up to similar to 14 GPa, or 6000 (V, P) pairs, can be considered hydrostatic within the resolution. The P-V data are fitted to the Rydberg-Vinet and the 3rd order Birch-Murnaghan EOS. Predicted pressures of these EOSs agree with those given by the Ruby2020 ruby scale to within +/- 0.05 GPa. Overall, pressures predicted by the Rydberg-Vinet EOS are in better agreement with the average of commonly used NaCl and Au pressure scales.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); National Science Foundation (NSF)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
2404486
Journal Information:
High Pressure Research, Journal Name: High Pressure Research Journal Issue: 1 Vol. 44; ISSN 0895-7959
Publisher:
Taylor & FrancisCopyright Statement
Country of Publication:
United States
Language:
English

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