Understanding the defect structure in complex oxides: check out this video abstract to find out more!
Oxide electronics, photovoltaics and catalysis are just some of the practical applications of functional oxides. Understanding and predicting the defect structure and formation in complex oxides allows us to precisely design oxide-based nanodevices for unique functional applications.
How are these defects formed? What particular mechanisms govern their formation? How can these defects affect the development of nanodevices?
In a recent publication in Advanced Functional Materials by Dr. Felip Sandiumenge et al., different atomic resolution imaging and spectroscopic techniques are combined to determine the complex structure of misfit dislocations in the perovskite type La0.67Sr0.33MnO3/LaAlO3 heteroepitaxial system.
They report that oxygen vacancies selectively accumulate at the tensile region of the dislocation strain field. Such accumulation of vacancies is accompanied by the reduction of manganese cations in the same area, resulting in a localized net positive charge. The results highlight a prototypical core model for perovskite-based heteroepitaxial systems and offer insights for predictive manipulation of misfit dislocation properties.
This is reported by Núria Bagués, José Santiso, Bryan D. Esser, Robert E. A. Williams, Dave W. McComb, Zorica Konstantinovic, Lluís Balcells, and Felip Sandiumenge in the article https://doi.org/10.1002/adfm.201704437.
To know more, please go to the Advanced Functional Materials homepage.