Long-range strain fields associated with dislocation cores at an oxide interface are shown to be sufficient enough to create significant variations in the chemical composition around the core (Cottrell atmospheres). Such stress-assisted diffusion of cations towards the cores is proposed to significantly impact the properties of nanoscale functional devices. The figure shows a Z-contrast image of a single dislocation core at an oxide interface.
Bibliographical noteThe authors would like to thank CONACYT Mexico, ARC DP 0666231, Office of Science, Office of Basic Energy Sciences of the US Department of Energy through grant number DE-FG02-03ER46057 and DE-AC02-05CH11231, the German Science Foundation (DFG) via SFB 762 and DEST International Linkage Grant for their support on this project.
ASJC Scopus subject areas
- Mechanical Engineering
- Mechanics of Materials
- Materials Science(all)
Arredondo-Arechavala, M., Ramasse, Q. M., Weyland, M., Mahjoub, R., Vrejoiu, I., Hesse, D., Browning, N. D., Alexe, M., Munroe, P., & Nagarajan, V. (2010). Direct evidence for cation non-stoichiometry and Cottrell atmospheres around dislocation cores in functional oxide interfaces. Advanced Materials, 22(22), 2430- 2434. https://doi.org/10.1002/adma.200903631