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O: Fachverband Oberflächenphysik
O 74: Poster Session VI: Oxide and insulator surfaces: Structure, epitaxy and growth II
O 74.2: Poster
Mittwoch, 3. März 2021, 13:30–15:30, P
Fe3O4 (001) near-surface diffusion observed by nuclear resonant scattering (NRS) — •Steffen Tober1,2, Jan-Christian Schober1,2, Esko Erik Beck1,2, Guilherme Dalla Lana Semione1,2, Simon Chung1,2, Kai Schlage1, Olaf Leupold1, Ilya Sergeev1, René Steinbrügge1, Hans-Christian Wille1, Heshmat Noei1, Vedran Vonk1, and Andreas Stierle1,2 — 1Deutsches Elektronen-Synchrotron, Hamburg — 2Universität Hamburg, Fachbereich Physik
Elevated temperature cation transport processes influence the structure and stoichiometry in the near surface region of magnetite (Fe3O4) (001) which is of crucial importance for the performance of magnetite-based catalysts and devices [1,2]. Near surface transport was studied by stepwise annealing of a homoepitaxially grown 57Fe3O4 layer on a (001) oriented Fe3O4 single crystal, monitored by nuclear resonant reflectivity (NRR) and time spectra (TS) after each step. Site selective depth profiles obtained from simultaneous fitting of NRR and TS indicate transport from 470 K on. Diffusion constants estimated from the 57Fe depth profiles were in good agreement with previous results [4], while the site-selectivity of NRS revealed notable differences in the transport of oct- and tet coordinated cations enabling a more precise description of the diffusion process.
[1] Arndt et al. Chem. Comm. 1, 92 (2019) [2] Arndt et al. Surf. Sci. 653, 76 (2016) [3] Andreeva et al., Mosc. Univ. Phys. Bull. 63, 132 (2008) [4] Tober et al., Phys Rev Research. 2, 023406 (2020)