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The physical state and properties of silicates at conditions encountered inthe cores of gas giants, ice giants and of Earth like exoplanets now discoveredwith masses up to several times the mass of the Earth remains mostly unknown.Here, we report on theoretical predictions of the properties of silica,SiO$_2$, up to 4 TPa and about 20,000K using first principle molecular dynamicssimulations based on density functional theory. For conditions found in theSuper-Earths and in ice giants, we show that silica remains a poor electricalconductor up to 10 Mbar due to an increase in the Si-O coordination withpressure. For Jupiter and Saturn cores, we find that MgSiO$_3$ silicate has notonly dissociated into MgO and SiO$_2$, as shown in previous studies, but thatthese two phases have likely differentiated to lead to a core made of liquidSiO$_2$ and solid (Mg,Fe)O.

Melting and metallization of silica in the cores of gas giants, ice giants and super Earths