About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Grain Boundaries, Interfaces, and Surfaces: Fundamental Structure-Property-Performance Relationships
|
| Presentation Title |
Grain Boundary Segregation and Conductivity in 3YSZ |
| Author(s) |
Yan Wang, Cai Ling, Aram Rezikyan, Kimberley Work, Tricia Harnas |
| On-Site Speaker (Planned) |
Yan Wang |
| Abstract Scope |
The observed lower grain boundary (GB) ionic conductivity relative to the bulk in 3mol% yttria-stabilized zirconia (3YSZ) is commonly explained by an intrinsic blocking effect caused by oxygen vacancy depletion in space charge layers formed at GBs. To elucidate underlying mechanisms of the intrinsic blocking effect at GBs in 3YSZ, effects of sintering temperature and cooling rate on GB segregation and conductivity in 3YSZ were studied. GBs in 3YSZ sintered at higher temperatures with faster cooling rates were found to have higher ionic conductivity and less Y segregation than those sintered at lower temperatures with slower cooling rates. This observation is hypothesized to arise from the preservation of GBs with high temperature state enabled by fast cooling. The learnings of this work will shed light upon how to engineer GBs in 3YSZ and other ionic conductors to tune their GB conductivities. |