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Title: High-pressure, high-temperature equations of state using nanofabricated controlled-geometry Ni/SiO 2/Ni double hot-plate samples

We have fabricated novel controlled-geometry samples for the laser-heated diamond anvil cell (LHDAC) in which a transparent oxide layer (SiO 2) is sandwiched between two laser-absorbing layers (Ni) in a single, cohesive sample. The samples were mass manufactured (>10 4 samples) using a combination of physical vapor deposition, photolithography, and wet and plasma etching. The double hot-plate arrangement of the samples, coupled with the chemical and spatial homogeneity of the laser-absorbing layers, addresses problems of spatial temperature heterogeneities encountered in previous studies where simple mechanical mixtures of transparent and opaque materials were used. Here we report thermal equations of state (EOS) for nickel to 100 GPa and 3000 K and stishovite to 50 GPa and 2400 K obtained using the LHDAC and in situ synchrotron x-ray micro-diffraction. Lastly, we discuss the inner core composition and the stagnation of subducted slabs in the mantle based on our refined thermal EOS.
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [5] ;  [2] ;  [2]
  1. The Ohio State Univ., Columbus, OH (United States); Case Western Reserve Univ., Cleveland, OH (United States)
  2. The Ohio State Univ., Columbus, OH (United States)
  3. Univ. of Chicago, Chicago, IL (United States); Smithsonian Institution, Washington, D.C. (United States); Univ. of California, Santa Cruz, CA (United States)
  4. Univ. of Chicago, Chicago, IL (United States)
  5. Carnegie Institution of Washington, Washington, D.C. (United States)
Publication Date:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Geophysical Research Letters
Additional Journal Information:
Journal Volume: 42; Journal Issue: 23; Journal ID: ISSN 0094-8276
American Geophysical Union
Research Org:
Carnegie Institution of Washington, Washington, D.C. (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
58 GEOSCIENCES; 36 MATERIALS SCIENCE; nanofabrication; diamond-anvil cell; high pressure; equation of state; nickel; stishovite
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1402310