Structure and Stoichiometry Self-Organization in a Mixed Vanadium–Iron Oxide Honeycomb Film on Ru(0001) - Sorbonne Université Access content directly
Journal Articles Journal of Physical Chemistry C Year : 2022

Structure and Stoichiometry Self-Organization in a Mixed Vanadium–Iron Oxide Honeycomb Film on Ru(0001)

Abstract

We report successful synthesis of a mixed V/Fe ultra-thin oxide phase on Ru(0001), in which mixing is governed by a self-organization scheme that selects V/Fe compositions close to 50%. Bias-dependent high resolution STM imaging and DFT simulations enabled a thorough characterization of its honeycomb-like structure with additional oxygen anions at the metal/oxide interface, as well as a convincing assignment of the two observed defect types. The mixed layer displays a unique structure and stoichiometry intermediate between those of pure vanadium and iron oxide films under the same experimental conditions. It results from a singular, geometry-driven mixing scenario in 2D which, thanks to the high interfacial oxygen content, is reminiscent of that known for bulk ternary oxides. Comparison with V/Fe mixed honeycomb layers on Pt(111) exemplifies how the choice of the metal substrate may induce largely different mixing behaviors. Such versatility opens a way towards a thorough fundamental understanding of the principles that underlie oxide alloying in 2D.
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Dates and versions

hal-03892411 , version 1 (09-12-2022)

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Piotr Igor Wemhoff, Claudine Noguera, Jacek Goniakowski, Niklas Nilius. Structure and Stoichiometry Self-Organization in a Mixed Vanadium–Iron Oxide Honeycomb Film on Ru(0001). Journal of Physical Chemistry C, 2022, 126 (46), pp.19947-19955. ⟨10.1021/acs.jpcc.2c06476⟩. ⟨hal-03892411⟩
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