Melting curve of SiO2 at multimegabar pressures: implications for gas giants and super-Earths
Author
dc.contributor.author
González Cataldo, Felipe
Author
dc.contributor.author
Davis, Sergio
Author
dc.contributor.author
Gutiérrez Gallardo, Gonzalo
Admission date
dc.date.accessioned
2016-11-16T19:53:02Z
Available date
dc.date.available
2016-11-16T19:53:02Z
Publication date
dc.date.issued
2016
Cita de ítem
dc.identifier.citation
Scientific Reports 6:26537 May 2016
es_ES
Identifier
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10.1038/srep26537
Identifier
dc.identifier.uri
https://repositorio.uchile.cl/handle/2250/141231
Abstract
dc.description.abstract
Ultrahigh-pressure phase boundary between solid and liquid SiO2 is still quite unclear. Here we present predictions of silica melting curve for the multimegabar pressure regime, as obtained from first principles molecular dynamics simulations. We calculate the melting temperatures from three high pressure phases of silica (pyrite-, cotunnite-, and Fe2P-type SiO2) at different pressures using the Z method. The computed melting curve is found to rise abruptly around 330 GPa, an increase not previously reported by any melting simulations. This is in close agreement with recent experiments reporting the alpha-PbO2-pyrite transition around this pressure. The predicted phase diagram indicates that silica could be one of the dominant components of the rocky cores of gas giants, as it remains solid at the core of our Solar System's gas giants. These results are also relevant to model the interior structure and evolution of massive super-Earths.
es_ES
Patrocinador
dc.description.sponsorship
CONICYT
201090712
Universidad de Chile
CONICYT-PIA grant, Chile
ACT-1115