Statistics – Computation
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmmr22a..06u&link_type=abstract
American Geophysical Union, Fall Meeting 2005, abstract #MR22A-06
Statistics
Computation
3924 High-Pressure Behavior, 5100 Physical Properties Of Rocks, 5410 Composition (1060, 3672), 5709 Composition (1060)
Scientific paper
CaIrO3-type MgSiO3 is the abundant planet-forming silicate, stable at pressures and temperatures (PTs) at and beyond those of Earth's core-mantle boundary (CMB). We have found using first principles quasiharmonic free energy computations that this mineral should undergo a phase transformation at PTs expected to occur in the cores of the gas giants. The transformation should also affect the thermal-chemical structure of the massive dense core of the Saturn-like exoplanet HD149026 and perhaps the mantle of Earth-like GJ876. At ~10 Mbar and ~ 10,000 K the resulting aggregate should have thermally activated carriers, causing electrical conductivity close to metallic values, and a correspondingly large electronic contribution to thermal conductivity, while simultaneously shutting down radiative heat transport because of electronic damping.
Allen Philip B.
Umemoto Koichiro
Wentzcovitch Renata M.
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