DPG Phi
Verhandlungen
Verhandlungen
DPG

Regensburg 2019 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

O: Fachverband Oberflächenphysik

O 27: Metal Oxide Surfaces I: Structure, Epitaxy and Growth

O 27.6: Vortrag

Dienstag, 2. April 2019, 12:00–12:15, H16

identification of two-dimensional FeO2 termination of hematite α−Fe2O3(0001) surface — •Jesús Redondo1,2, Petr Lazr3, Pavel Procházka4, Stanislav Průša4, Jan Lachnitt2, Benjamín Mallada1, Aleš Cahlík1, Jan Berger1, Břetislav Šmíd2, Pavel Jelínek1, Jan Čechal4, and Martin Švec11Institute of Physics, Czech Academy of Sciences, Prague — 2Faculty of Mathematics and Physics, Charles University, Prague — 3RCPTM, Olomouc — 4CEITEC, Brno

Iron oxides are among the most abundant compounds on Earth and have consequently been studied and used extensively in industrial processes. Despite these efforts, concrete understanding of some of their surface phase structures has remained elusive, in particular the oxidized α−Fe2O3(0001) hematite surface. We detail an optimized recipe to produce this phase over the entire hematite surface and study the geometrical parameters and composition of its complex structure by means of atomically resolved microscopy, electron diffraction and surface-sensitive spectroscopies. We conclude that the oxidized α−Fe2O3(0001) surface is terminated by a two-dimensional iron oxide with structure, lattice parameters, and orientation different from the bulk substrate. Using total-energy density functional theory for simulation of a large-scale atomic model, we identify the structure of the surface layer as antiferromagnetic, conductive 1TFeO2 attached on half-metal terminated bulk. The model succeeds in reproducing the characteristic modulations observed in the atomically resolved images and electron diffraction patterns.

100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2019 > Regensburg