Affiliation:
1. Department of Materials Science and Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA
2. School of Materials Science and Engineering National Institute for Advanced Materials Nankai University Tianjin 300350 P. R. China
Abstract
AbstractOxygen coordination and vacancy ordering play an important role in dictating the functionality of complex oxides. In this work, an unconventional layering of oxygen ions in a mixed conductor SrCo1‐xFexO3‐δ (SCFO) thin film grown epitaxially on SrTiO3 (STO) is reported. Scanning transmission electron microscopy (STEM) reveals alternating layers of oxygen deficiency along the growth direction, with the oxygen‐rich layer correlated with the neighboring Co,Fe‐site intensity, and contraction of the Sr–Sr distance. Density functional theory (DFT) calculations and STEM image simulations support the emergence of periodic (Co,Fe)O6 and (Co,Fe)O4/(Co,Fe)O5 layers, an ordering that is also sensitive to the Co:Fe ratio.
Funder
Army Research Laboratory
National Science Foundation