| About this Abstract |
| Meeting |
MS&T23: Materials Science & Technology
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| Symposium
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Grain Boundaries, Interfaces, and Surfaces: Fundamental Structure-Property-Performance Relationships
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| Presentation Title |
Which Interfaces Matter Most? Variability in Grain Boundary Defect Chemistry and Conductivity in a Concentrated Solid Electrolyte
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| Author(s) |
Hasti Vahidi, Alejandro Mejia, Shengquan Xuan, Angel Cassiadoro, Abednego Abdi, David Mebane, William Bowman |
| On-Site Speaker (Planned) |
William Bowman |
| Abstract Scope |
The diminished grain boundary (GB) conductivity in polycrystalline oxides remains a significant drawback to highly conductive solid electrolytes for applications including solid oxide fuel/electrolysis cells and solid-state batteries. While current models explain the near-GB defect behavior in dilute solid solutions, incorporate defect-defect interactions (in concentrated solutions), and chemo-mechanical stress, there is yet to be a new model that predicts individual GB conductivities in concentrated solid-solutions via direct experimental measurements of near-GB defect chemistry. Here, [1] we present a novel experimental-computational approach that predicts which GBs in a polycrystalline solid electrolyte will likely facilitate ionic conductivity. By microscopically measuring the GB-to-GB variability in point defect concentrations and applying a new thermodynamic phase field modeling framework, we revealed a non-monotonic relationship between oxygen vacancy depletion and GB ionic conductivity. This lays the foundation for the design of functional solid electrolytes essential in energy applications.
[1] H. Vahidi … W.J. Bowman (Submitted) |