Fig. 5: Formation of the FeO phase in the Fe2O3-SiO2-H2O system under high pressure-temperature conditions of the deep lower mantle. | Nature Communications

Fig. 5: Formation of the FeO phase in the Fe2O3-SiO2-H2O system under high pressure-temperature conditions of the deep lower mantle.

From: Pressure stabilizes ferrous iron in bridgmanite under hydrous deep lower mantle conditions

Fig. 5

A The starting material was Fe(OH)3 sandwiched between dry SiO2 layers (Run#335-95). The pyrite-structured FeOOHx (py-FeOOH) is in coexistence with rhombohedral(R) FeO when H2O is over-saturated in NiAs-type SiO2 (Nt). B A hydrous gel sample with a molar ratio of Fe2O3: SiO2 = 1:4 containing ~2 wt.% H2O was loaded in Ne medium (Run#332-99). The CaCl2-type silica (Ct) is in coexistence with FeO(R) when H2O is unsaturated in the coexisting Nt phase. The X-ray wavelength was 0.6199 Å.

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