|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Frontiers in Advanced Functional Thin Films and Nanostructured Materials
||Oxide Epitaxy with Large Mismatch: Bronze-phase VO2 on SrTiO3
||Matthew Chisholm, Hunter Sims, Xiang Gao, Shinbuhm Lee, Sokrates Pantelides, Ho Nyung Lee
|On-Site Speaker (Planned)
Recent studies in developing advanced energy storage found VO2(B) to be a promising cathode material for Li-ion batteries. In this work, we report aberration-corrected scanning transmission electron microscopy (STEM) imaging and electron energy-loss spectroscopy (EELS) data, as well as density functional theory calculations, and use these results to understand how two dissimilar materials can form an epitaxial heterostructure. Based on the atomic-scale investigation by STEM, we found an interfacial bi-layer at the VO2(B)/STO interface that promotes epitaxial growth of a structurally complex, low-symmetry film on a high-symmetry substrate. We find a new double-layer structure that agrees with the observed intensities and interlayer distances. Differences in bonding behavior between the old and new models for the reconstructed interfacial layer lead us to propose an explanation for the epitaxial growth of the VO2(B) films that suggests a path for the creation of new symmetry-mismatched heterostructures.
||Planned: Supplemental Proceedings volume