Structure and Melting of Fe, MgO, SiO2, and MgSiO3 in Planets: Database, Inversion, and Phase Diagram

Kavli Affiliate: Paul D. Asimow

| First 5 Authors: Junjie Dong, Gabriel-Darius Mardaru, Paul D. Asimow, Lars P. Stixrude, Rebecca A. Fischer

| Summary:

We present globally inverted pressure-temperature (P-T) phase diagrams up to
5,000 GPa for four fundamental planetary materials, Fe, MgO, SiO2, and MgSiO3,
derived from logistic regression and supervised learning, together with an
experimental phase equilibria database. These new P-T phase diagrams provide a
solution to long-standing disputes about their melting curves. Their
implications extend to the melting and freezing of rocky materials in the
interior of giant planets and super-Earth exoplanets, contributing to the
refinement of their internal structure models.

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