Site-Resolved Near-Surface Cation Diffusion in Magnetite

IF 8.1 1区物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY

Physical review letters Pub Date : 2025-06-13 DOI:10.1103/physrevlett.134.236203

Steffen Tober, Jan-Christian Schober, Marcus Creutzburg, Esko Erik Beck, Guilherme Dalla Lana Semione, Simon Chung, Leon Jacobse, Björn Arndt, Alina Vlad, René Steinbrügge, Hans-Christian Wille, Ilya Sergueev, Heshmat Noei, Kai Schlage, Olaf Leupold, Vedran Vonk, Andreas Stierle

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Abstract

nuclear forward scattering shows a thermally induced cation exchange between a Fe573O4 thin-film and a Fe3O4 (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.

Published by the American Physical Society

2025

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磁铁矿中位置分辨近表面阳离子扩散

核正向散射表明，Fe573O4薄膜和Fe3O4（001）衬底之间主要在八面体亚晶格中发生热诱导阳离子交换，温度范围在470 ~ 710 K之间。在此温度范围内的总活化势垒为19±32 kJ/mol，明显低于根据体扩散模型推断的结果。这种观察结果可以归因于表面x射线衍射确定的大的非平衡阳离子赤字。尽管跳跃势垒相对较低，但扩散常数比具有平衡阳离子化学计量的磁铁矿的预期值低约5个数量级。这些结果与依赖于磁铁矿近表面结构和化学计量学的应用有关，我们认为阳离子扩散和化学计量学之间的相关性可能在更广泛的氧化物材料中发挥作用。2025年由美国物理学会出版

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Physical review letters 物理-物理：综合

CiteScore

16.50

自引率

7.00%

发文量

2673

审稿时长

2.2 months

期刊介绍： Physical review letters(PRL)covers the full range of applied, fundamental, and interdisciplinary physics research topics: General physics, including statistical and quantum mechanics and quantum information Gravitation, astrophysics, and cosmology Elementary particles and fields Nuclear physics Atomic, molecular, and optical physics Nonlinear dynamics, fluid dynamics, and classical optics Plasma and beam physics Condensed matter and materials physics Polymers, soft matter, biological, climate and interdisciplinary physics, including networks