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- W4384407612 abstract "Polar discontinuities, as well as compositional and structural changes at oxide interfaces can give rise to a large variety of electronic and ionic phenomena. In contrast to earlier work focused on domain walls and epitaxial systems, this work investigates the relation between polar discontinuities and the local chemistry at grain boundaries in polycrystalline ferroelectric ErMnO3 . Using orientation mapping and scanning probe microscopy (SPM) techniques, the polycrystalline material is demonstrated to develop charged grain boundaries with enhanced electronic conductance. By performing atom probe tomography (APT) measurements, an enrichment of erbium and a depletion of oxygen at all grain boundaries are found. The observed compositional changes translate into a charge that exceeds possible polarization-driven effects, demonstrating that structural phenomena rather than electrostatics determine the local chemical composition and related changes in the electronic transport behavior. The study shows that the charged grain boundaries behave distinctly different from charged domain walls, giving additional opportunities for property engineering at polar oxide interfaces." @default.
- W4384407612 created "2023-07-16" @default.
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- W4384407612 date "2023-08-06" @default.
- W4384407612 modified "2023-10-14" @default.
- W4384407612 title "Quantitative Mapping of Chemical Defects at Charged Grain Boundaries in a Ferroelectric Oxide" @default.
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- W4384407612 doi "https://doi.org/10.1002/adma.202302543" @default.
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