Structural Evolution of α-Fe₂O₃(0001) Surfaces Under Reduction Conditions Monitored by Infrared Spectroscopy.

ABSTRACT: The precise determination of the surface structure of iron oxides (hematite and magnetite) is a vital prerequisite to understand their unique chemical and physical properties under different conditions. Here, the atomic structure evolution of the hematite (0001) surface under reducing conditions was tracked by polarization-resolved infrared reflection absorption spectroscopy (IRRAS) using carbon monoxide (CO) as a probe molecule. The frequency and intensity of the CO stretch vibration is extremely sensitive to the valence state and electronic environments of surface iron cations. Our comprehensive IRRAS results provide direct evidence that the monocrystalline, stoichiometric α-Fe₂O₃(0001) surface is single Fe-terminated. The initial reduction induced by annealing at e

SUBMITTER: Schottner L 

PROVIDER: S-EPMC6603135 | biostudies-literature | 2019

REPOSITORIES: biostudies-literature