Fig. 6: Scanning and transmission electron microscopies (SEM and TEM) observation of a metallic iron nail.
From: Fe2+ disproportionation within iron-rich alkaline vent analogues reveals proto-bioenergetic systems
A Localization of the ultrathin section performed on a metallic iron nail (72 h sample). B TEM observation of the FIB section. C Mapping of the oxygen percentage conducted on the FIB section. Metallic iron, in red (<5% O), is surrounded by iron oxides, in blue (>40% O). D Corresponding energy dispersive X-ray spectra of the metallic iron (in blue) and of the iron oxides (in red). E TEM observation of the metallic iron (in red) and iron oxide (in blue) interface, as attested by the measured interatomic distance (in blue) and the electron diffraction pattern (in red).
