About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Grain Boundaries, Interfaces, and Surfaces: Fundamental Structure-Property-Performance Relationships
|
| Presentation Title |
Correlating Atomic Structure to Velocity of Grain Boundaries in Metal Oxides |
| Author(s) |
Mehmet Can Dursun, Hailey E Hall, Amanda R Krause |
| On-Site Speaker (Planned) |
Mehmet Can Dursun |
| Abstract Scope |
Space charge layers (SCL) in ceramic materials are charged regions at grain boundaries (GBs) that form by defect accumulation that attract oppositely charged defects. Although SCLs are claimed to cause GB drag, the correlation between SCLs and GB velocity remains unknown because conventional characterization methods cannot examine the same GB at different length scales. Here, we use laboratory x-ray diffraction contrast tomography (LabDCT), a non-destructive, 3D microstructure characterization method, to track GB motion in polycrystalline metal oxides. Transmission electron microscopy (TEM) lamellae are prepared from the same GBs characterized by LabDCT. Structural and chemical characterization of GBs are done using TEM and scanning TEM, to observe defect accumulation at the GB that form SCLs. This multi-length scale characterization allows comparison of the GB velocities and defect concentration at GBs that form SCLs, showing the effect of SCL on GB migration. |