Fig. 1: Water adsorption on α-Fe2O3(\(1\bar{1}02\)).
From: Rapid oxygen exchange between hematite and water vapor
a Top view on the bulk-truncated α-Fe2O3(\(1\bar{1}02\)) surface. The red (larger) and yellow (smaller) balls correspond to oxygen and iron; the surface unit cell contains two O and two Fe atoms. A full analysis of this surface termination is provided in ref. 24. In this work, the azimuthal angle of 0° is defined as the (\(1\bar{1}0\bar{1}\)) direction. b, c Two phases of water adsorbed on this surface, both of which consist of partially-dissociated water dimers25. The bright blue and dark blue balls correspond to oxygen in H2O and OH, respectively. d D2O TPD (temperature ramp 1 K/s) shows two main desorption peaks (β, γ) before the multilayer forms (α). The saturation coverages of the β, γ peaks correspond to models shown in b and c, respectively.
