About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Ceramic Materials and Processing
|
| Presentation Title |
Electric Current-Induced Microstructural Evolution in Polycrystalline SrTiO3 |
| Author(s) |
Jingjing Yang, Jian Luo |
| On-Site Speaker (Planned) |
Jingjing Yang |
| Abstract Scope |
This study investigates how applied electric currents can alter microstructures in SrTiO₃. Applied fields drive defect motion, forming a Ti-rich region near the anode and an adjacent Sr-rich belt moving towards the cathode. Under a large electric current, elongated abnormal grains originate from the Sr-rich belt, growing to the anode and then enlarging towards the cathode, while there is essentially no grain growth at the cathode. A Brouwer diagram is established to explain the defect motion. The conversion of ionic currents (in Sr-enriched belt) to electronic currents, with insufficient oxygen diffusion and supply, generates substantial oxygen vacancies and causes local reduction. Field-driven defects distribution results in Sr-rich and O-deficient grain boundaries (with reduced Ti states), which are fast-moving to cause abnormal grain growth. Ti-rich regions at the anode can further promote the growth of abnormal grains via enhancing bulk diffusion. These findings enrich our knowledge of electric current-driven microstructural evolution. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Ceramics, Characterization, |