| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
ACerS Robert B. Sosman Award Symposium: Bridging the Gap between Atomistic and Continuum Approaches to Interface Science
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| Presentation Title |
Disconnections, Faceting, Solutes and Their Impact on Grain Boundary Migration in Ceramics |
| Author(s) |
Rheinheimer Wolfgang, Hadas Sternlicht |
| On-Site Speaker (Planned) |
Rheinheimer Wolfgang |
| Abstract Scope |
The recent years have seen several new concepts appearing in the field of grain growth in ceramics. From a macroscopic perspective, the impact of anisotropy and space charge on grain boundary migration has moved into focus. On atomistic scale, grain boundary adsorption and complexions have been investigated in detail, and disconnections and their migration has been proposed as mechanism of grain boundary migration.
Most recent work has focused on alumina and strontium titanate. From a defect-chemical perspective, these two materials are fundamentally different regarding the solubility limits of dopants. In general, alumina has a low and strontium titanate high solubility. As a result, alumina tends to from adsorption structures at the interfaces, while grain boundaries in strontium titanate are well-known for diffuse accumulation (i.e. space charge). In this light, this talk follows the concepts listed above from macroscopic down to atomistic and discusses their impact on grain boundary migration. |