Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 42, Issue 23, Pages 10239-10247Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2015GL066577
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Funding
- NSF [EAR 09-55647, EAR-1427123]
- OSU Presidential Fellowship
- OSU School of Earth Sciences McCaughey Fellowship
- American Dissertation Fellowship from the American Association of University Women
- Friends of Orton Hall - OSU-SES
- DOE-NNSA [DE-NA0001974]
- DOE-BES [DE-FG02-99ER45775]
- DOE Office of Science by Argonne National Laboratory [DE-AC02-06CH11357]
- Directorate For Geosciences
- Division Of Earth Sciences [1452545, 955647] Funding Source: National Science Foundation
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We have fabricated novel controlled-geometry samples for the laser-heated diamond-anvil cell (LHDAC) in which a transparent oxide layer (SiO2) is sandwiched between two laser-absorbing layers (Ni) in a single, cohesive sample. The samples weremassmanufactured (> 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 50GPa and 2400 K obtained using the LHDAC and in situ synchrotron X-ray microdiffraction. We discuss the inner core composition and the stagnation of subducted slabs in the mantle based on our refined thermal EOS.
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