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| 001 | 631049 | ||
| 005 | 20250715151532.0 | ||
| 024 | 7 | _ | |a 10.1103/PhysRevLett.134.236203 |2 doi |
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| 100 | 1 | _ | |a Tober, Steffen |0 P:(DE-H253)PIP1030341 |b 0 |e Corresponding author |u desy |
| 245 | _ | _ | |a Site-Resolved Near-Surface Cation Diffusion in Magnetite |
| 260 | _ | _ | |a College Park, Md. |c 2025 |b APS |
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| 520 | _ | _ | |a 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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| 773 | _ | _ | |a 10.1103/PhysRevLett.134.236203 |g Vol. 134, no. 23, p. 236203 |0 PERI:(DE-600)1472655-5 |n 23 |p 236203 |t Physical review letters |v 134 |y 2025 |x 0031-9007 |
| 856 | 4 | _ | |u https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.134.236203 |
| 856 | 4 | _ | |u https://bib-pubdb1.desy.de/record/631049/files/PhysRevLett.134.236203.pdf |y OpenAccess |
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