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High‐pressure, high‐temperature equations of state using nanofabricated controlled‐geometry Ni/SiO 2 /Ni double hot‐plate samples
Author(s) -
Pigott Jeffrey S.,
Ditmer Derek A.,
Fischer Rebecca A.,
Reaman Daniel M.,
Hrubiak Rostislav,
Meng Yue,
Davis Robert J.,
Panero Wendy R.
Publication year - 2015
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2015gl066577
Subject(s) - materials science , opacity , homogeneity (statistics) , diamond anvil cell , stishovite , laser , chemical vapor deposition , thermal , inner core , analytical chemistry (journal) , composite material , optics , diffraction , thermodynamics , nanotechnology , chemistry , physics , mathematics , statistics , quartz , chromatography
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 microdiffraction. We discuss the inner core composition and the stagnation of subducted slabs in the mantle based on our refined thermal EOS.