| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Functional Defects in Electroceramic Materials
|
| Presentation Title |
Dislocation-based Nanomechanics in Functional Oxides: A Case Study on SrTiO3 |
| Author(s) |
Xufei Fang, Kuan Ding, Stephan Janocha, Christian Minnert, Till Frömling, Karsten Durst, Atsutomo Nakamura, Jürgen Rödel |
| On-Site Speaker (Planned) |
Xufei Fang |
| Abstract Scope |
In light of the rising topic of dislocation-based functionality of oxides, the dislocation-based mechanical behavior, for instance, dislocation plasticity and potentially crack formation induced by dislocations is also drawing increasing attention. Understanding the dislocation-based mechanics in oxides can play a critical role in assessing the materials’ mechanical and functional reliability. Here we present an approach to actively engineer and evaluate the incipient dislocation plasticity and crack formation using nanoindentation. We propose the concept of “defect chemistry engineering” to actively tune the dislocation plasticity of the oxide crystals, as will be demonstrated in single-crystal SrTiO3. Two methods, i.e., via stoichiometry change of the Sr/Ti ratio, and by reduction treatment to increase oxygen vacancy concentration, have been validated to modify the dislocation nucleation and motion. Our approach may also serve as a potential method to increase the fracture toughness of the material with appreciable dislocation plasticity achieved. |