Fig. 1: Back-scattered electron (BSE) images and elemental mapping of run products.
From: Extensive iron–water exchange at Earth’s core–mantle boundary can explain seismic anomalies
a Under hydrous conditions at 2473 K for 1 min (OT2842). b Under anhydrous (left) and hydrous (right) conditions at 1500 K for 180 min (OT2915a,b). c Under hydrous conditions at 1773 K for 180 min (OT2829). d A magnified view of the FeO-rich layer shown in c. The phases present are bridgmanite (dark grey), ferropericlase (light grey), and metallic iron (white). e Fe, Si, and Mg distributions in d. f, g BSE images and Fe, Ni, O, Si, and Mg distributions of the recovered samples under hydrous conditions using an Fe–Ni alloy annealed at (f) 2473 K (OT2933b) and (g) 1473 K (OT2934b). Ni enrichment in the FeO-rich layer suggests penetration of the molten Fe–Ni alloy. The quenched Fe-Ni liquid forms metal dendrites due to the separation of FeO.
