| 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
|
| Presentation Title |
Charged Interfaces: Equilibrium, Phase Transitions, and Microstructural Evolution |
| Author(s) |
KSN Vikrant, Edwin Garcia |
| On-Site Speaker (Planned) |
Edwin Garcia |
| Abstract Scope |
Surfaces and interfaces in ionic ceramics play a pivotal role in defining the properties and microstructural evolution in many of the existing and emerging material applications. In this presentation, the effects of ionic species and point defects on the stability of grain boundaries in polycrystalline ceramics are discussed by using a thermodynamically consistent variational framework. The transport properties induced by the broad region of electrochemical influence in front of a grain boundary are quantified, and the effect of non-electrochemical driving forces, including stresses, misorientations, and structural disorder are considered. The theory outlines the conditions that lead to the interfacial phase transition of surfaces and interfaces. Further, the effects of electrostatic charge on grain boundary motion during grain growth are quantified as a direct extension of John Cahn’s solute drag theory. Presented applications include the microstructural mechanisms leading to the onset of flash sintering, abnormal grain growth, and ferroelectric fatigue. |