Journal Article

PUBDB-2025-01918

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Site-Resolved Near-Surface Cation Diffusion in Magnetite

Tober, S. (Corresponding author)DESY* ; Schober, J.-C.DESY* ; Creutzburg, M.DESY* ; Beck, E. E.DESY* ; Semione, G. D. L.Extern* ; Chung, S.Extern* ; Jacobse, L.Extern* ; Arndt, B.DESY* ; Vlad, A.Extern* ; Steinbrügge, R.Extern* ; Wille, H.-C.DESY* ; Sergeev, I.DESY* ; Noei, H.DESY* ; Schlage, K.DESY* ; Leupold, O.DESY* ; Vonk, V. (Corresponding author)DESY* ; Stierle, A. (Corresponding author)DESY*

2025
APS College Park, Md.

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Please use a persistent id in citations: doi:10.1103/PhysRevLett.134.236203  doi:10.3204/PUBDB-2025-01918

Abstract: In situ nuclear forward scattering shows a thermally induced cation exchange between a 57 Fe3 ⁢O4 thin-film and a Fe3⁢ O4 (001) substrate predominantly in the octahedral sublattice for a temperature range between 470 and 710 K. The overall activation barrier in this temperature range is found to be 19±32  kJ/mol, which is significantly lower than expected from extrapolating a bulk diffusion model. This observation can be attributed to the large out-of-equilibrium cation deficit as determined by surface x-ray diffraction. Despite the relatively low hopping barrier, the diffusion constant is about 5 orders of magnitude lower than expected for magnetite having an equilibrium cation stoichiometry. The results are relevant for applications relying on the near-surface structure and stoichiometry of magnetite, and we argue that the correlation between cation diffusion and stoichiometry may play a role for a wider range of oxide materials.

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Contributing Institute(s):

1. Nanolab (FS-NL)
2. PETRA-S (FS-PETRA-S)

Research Program(s):

1. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)
2. SFB 986 C07 - Deposition und Stabilität von hochtemperaturfesten geschichteten Metamaterialien (C07) (318029273) (318029273)
3. DFG project G:(GEPRIS)192346071 - SFB 986: Maßgeschneiderte Multiskalige Materialsysteme - M3 (192346071) (192346071)

Experiment(s):

1. DESY NanoLab: Sample Preparation
2. DESY NanoLab: Surface Spectroscopy
3. DESY NanoLab: X-Ray Diffraction
4. PETRA Beamline P01 (PETRA III)

Appears in the scientific report 2025

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Electronics and Telecommunications Collection ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; Nationallizenz ; SCOAP3 sponsored Journal ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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