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IrO2 Surface Complexions Identified Through Machine Learning and Surface Investigations

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arxiv 2009.11569 v1 pith:S3AOQ4OG submitted 2020-09-24 cond-mat.mtrl-sci

classification cond-mat.mtrl-sci
keywords complexionsfacetsiro2surfaceanalogousannealingapproximationbattery
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A Gaussian Approximation Potential (GAP) was trained using density-functional theory data to enable a global geometry optimization of low-index rutile IrO2 facets through simulated annealing. Ab initio thermodynamics identifies (101) and (111) (1x1)-terminations competitive with (110) in reducing environments. Experiments on single crystals find that (101) facets dominate, and exhibit the theoretically predicted (1x1) periodicity and X-ray photoelectron spectroscopy (XPS) core level shifts. The obtained structures are analogous to the complexions discussed in the context of ceramic battery materials.

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