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Title: Intercomparison of the gold, platinum, and MgO pressure scales up to 140 GPa and 2500 K

Journal Article · · Journal of Geophysical Research. Solid Earth
DOI:https://doi.org/10.1002/2016JB013811· OSTI ID:1368221
ORCiD logo [1]; ORCiD logo [2];  [3]; ORCiD logo [4]
  1. China Univ. of Geosciences, Wuhan (China); Arizona State Univ., Tempe, AZ (United States)
  2. Univ. of Chicago, Chicago, IL (United States)
  3. Carnegie Inst. of Washington, Washington, DC (United States)
  4. Arizona State Univ., Tempe, AZ (United States)

In order to intercalibrate the equations of state (EOSs) of the three widely used pressure standards, gold, platinum, and MgO, we have measured their unit cell volumes together in the laser–heated diamond anvil cell up to 140 GPa and 2500 K. At 300 K, three standards agree with each other within ±2.5 GPa to 135 GPa if the EOSs measured in quasi–hydrostatic media are used. We further refined the EOSs at 300 K, making them consistent with each other within ±1 GPa up to 135 GPa. At high temperature (T), the three standards match the best within ±1 GPa between 40 and 140 GPa, when we use the scales by Dorogokupets and Dewaele (2007). However, a 2–3 GPa discrepancy remains at 20–40 GPa and 1500–2000 K, with gold yielding the highest pressure (P). The pressure discrepancy is likely related to steep decreases in the Grüneisen parameter, the anharmonicity, and/or the electronic effects for the standards at the P–T conditions. Because gold melts near the temperatures expected for the mantle transition zone, severe anharmonic effects expected under premelting conditions make gold unsuitable for determining the phase boundaries in the region. The pressure scales by Dorogokupets and Dewaele (2007) provide tighter constrains on the Clapeyron slopes of the postspinel boundary to –2.0 to –2.7 MPa/K and the postperovskite boundary to 7–10 MPa/K. In conclusion, the data and refined EOSs presented here allow for reliable comparisons among experiments with different pressure standards for the entire P–T conditions expected for the Earth's lower mantle.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
FG02-94ER14466; NA0001974; FG02-99ER45775; AC02-06CH11357
OSTI ID:
1368221
Alternate ID(s):
OSTI ID: 1373812
Journal Information:
Journal of Geophysical Research. Solid Earth, Vol. 122, Issue 5; ISSN 2169-9313
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 29 works
Citation information provided by
Web of Science

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Cited By (3)

High pressure high temperature devitrification of Fe 78 B 13 Si 9 metallic glass with simultaneous x-ray structural characterization journal June 2018
Equation of state of solid Ne inter-calibrated with the MgO, Au, Pt, NaCl-B2, and ruby pressure scales up to 130 GPa journal August 2018
The Bridgmanite–Akimotoite–Majorite Triple Point Determined in Large Volume Press and Laser-Heated Diamond Anvil Cell journal January 2020