Oxidation induced strain and defects in magnetite crystals

Ke Yuan (), Sang Soo Lee, Wonsuk Cha, Andrew Ulvestad, Hyunjung Kim, Bektur Abdilla, Neil C. Sturchio and Paul Fenter ()
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Ke Yuan: Chemical Sciences and Engineering Division, Argonne National Laboratory
Sang Soo Lee: Chemical Sciences and Engineering Division, Argonne National Laboratory
Wonsuk Cha: Advanced Photon Source, Argonne National Laboratory
Andrew Ulvestad: Materials Science Division, Argonne National Laboratory
Hyunjung Kim: Sogang University
Bektur Abdilla: University of Delaware
Neil C. Sturchio: University of Delaware
Paul Fenter: Chemical Sciences and Engineering Division, Argonne National Laboratory

Nature Communications, 2019, vol. 10, issue 1, 1-10

Abstract: Abstract Oxidation of magnetite (Fe3O4) has broad implications in geochemistry, environmental science and materials science. Spatially resolving strain fields and defect evolution during oxidation of magnetite provides further insight into its reaction mechanisms. Here we show that the morphology and internal strain distributions within individual nano-sized (~400 nm) magnetite crystals can be visualized using Bragg coherent diffractive imaging (BCDI). Oxidative dissolution in acidic solutions leads to increases in the magnitude and heterogeneity of internal strains. This heterogeneous strain likely results from lattice distortion caused by Fe(II) diffusion that leads to the observed domains of increasing compressive and tensile strains. In contrast, strain evolution is less pronounced during magnetite oxidation at elevated temperature in air. These results demonstrate that oxidative dissolution of magnetite can induce a rich array of strain and defect structures, which could be an important factor that contributes to the high reactivity observed on magnetite particles in aqueous environment.

Date: 2019
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DOI: 10.1038/s41467-019-08470-0

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