| About this Abstract |
| Meeting |
MS&T23: Materials Science & Technology
|
| Symposium
|
Grain Boundaries, Interfaces, and Surfaces: Fundamental Structure-Property-Performance Relationships
|
| Presentation Title |
Investigation of Grain Boundaries in SrTiO<sub>3</sub>: Correlation of Space Charge and Non-Arrhenius Grain Growth |
| Author(s) |
Pascal Zahler, Dylan Jennings, Wolfgang Rheinheimer |
| On-Site Speaker (Planned) |
Pascal Zahler |
| Abstract Scope |
Space charge is known to decrease electrical conductivity of ceramics. Beyond electric properties, space charge is also impacting microstructure evolution: Strontium titanate is known for its non-Arrhenius grain growth behavior, which results from a transition of normal to abnormal grain growth caused by solute drag. Beyond knowledge on microstructure evolution, this study focuses on the electric properties of grain boundaries during non-Arrhenius grain growth. Undoped SrTiO<sub>3</sub> samples are annealed at different temperatures and times. The space charge layers are analyzed by EIS and STEM-EDS. The results are compared to calculations based on different space charge models. Two types of grain boundaries with different widths and potentials are identified. Also, changes in the space charge potential and widths are observed with changing annealing conditions and compared to the grain growth behavior. The findings agree well with the co-existence of two grain boundary types causing non-Arrhenius grain growth in SrTiO<sub>3</sub>. |