Experimental evidence for the existence of iron-rich metal in the Earth's lower mantle

By D. Frost, C. Liebske, F. Langenhorst, C. McCammon, R. Trønnes, D. Rubie. Nature, 2004

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The Constancy of Upper Mantle fO2 Through Time Inferred from V/Sc Ratios in Basalts: Implications for the Rise in Atmospheric O2 (2004, background): “However, it has been recently suggested that disproportionation of FeO to Fe and Fe at high pressures followed by segregation of the metal phase to the core could lead to a net increase in the amount of oxygen, and hence fO2, of the mantle early in Earth’s history [37].”
Valence state and spin transitions of iron in Earth's mantle silicates (2006, background): “[3,5] found disproportionation of Fe into Fe and metallic iron at lower mantle conditions, with Pv having the Fe/ΣFe ratio of at least 0.”
In situ observations of phase transition between perovskite and CaIrO3-type phase in MgSiO3 and pyrolitic mantle composition (2005, background): “The CaIrO3-type structure in Fe2O3 is stable above 60 GPa (Table 6), and it has been reported that Fe2O3 components readily dissolve in the MgSiO3 phase [24,25].”
Spin state of ferric iron in MgSiO3 perovskite and its effect on elastic properties (2010, background): “Several studies (Frost et al., 2004; Zhang and Oganov, 2006; Auzende et al., 2008) have shown that Fe may disproportionate, creating free Fe metal, enriching Pv with Fe.”