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Title: Accurate equation of state of H 2 – He binary mixtures up to 5.4 GPa

Journal Article · · Physical Review. B
ORCiD logo [1];  [1];  [2];  [2];  [2]; ORCiD logo [3];  [3]; ORCiD logo [3]; ORCiD logo [3]; ORCiD logo [1]
  1. University of Illinois, Chicago, IL (United States)
  2. Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
  3. Univ. of Chicago, IL (United States)
+ Show Author Affiliations

Brillouin scattering spectroscopy has been used to obtain an accurate (<1%) ρ-P equation of state (EOS) of 1:1 and 9:1 H2-He molar mixtures from 0.5 to 5.4 GPa at 296 K. Our calculated equations of state indicate close agreement with the experimental data right to the freezing pressure of hydrogen at 5.4 GPa. The measured velocities agree on average, within 0.5%, of an ideal mixing model. The ρ-P EOSs presented have a standard deviation of under 0.3% from the measured densities and under 1% deviation from ideal mixing. Furthermore, a detailed discussion of the accuracy, precision, and sources of error in the measurement and analyses of our equations of state is presented.

Research Organization:
University of Illinois, Chicago, IL (United States); Argonne National Laboratory (ANL), Argonne, IL (United States); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
Grant/Contract Number:
NA0003975; EAR-1634415; AC02-06CH11357; NA0003525
OSTI ID:
2263360
Alternate ID(s):
OSTI ID: 2311262
Report Number(s):
SAND-2024-15059J; TRN: US2407743
Journal Information:
Physical Review. B, Vol. 108, Issue 22; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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75 CONDENSED MATTER PHYSICS
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Equations of state
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Raman spectroscopy