Oxygen Diffusion in Perovskites with Sr-doping Induced Oxygen Vacancies
Andrew Lubimtsev
Department of Materials Science & Engineering, University of Tennessee
This page shows visualizations of the oxygen diffusion in a relatively motionless perovskite lattice.
Enhancing ionic conductivity is important for the achievement of high performance energy storage devices with fast charging rates. In the perfect lattice, neighboring atoms block diffusion paths. Oxygen vacancies are induced by introducing substitution impurity atoms with a different valence into the system. These vacancies are favorable, since the system must maintain charge neutrality. The presence of these vacancies opens paths through which ions can diffuse, thus achieving ionic conductivity several orders of magnitude higher than the undoped material. These results indicate that ideal energy storage materials would be highly disordered or porous, such that there are many adsorption sites along diffusion paths with low barriers.
Color Legend: References
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updated: March 2016.