| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
|
Grain Boundaries, Interfaces, and Surfaces: Fundamental Structure-Property-Performance Relationships
|
| Presentation Title |
Moisture Incorporation and Degradation in Dielectrics and Piezoelectrics |
| Author(s) |
John R. McGarrahan, Elizabeth Dickey |
| On-Site Speaker (Planned) |
John R. McGarrahan |
| Abstract Scope |
The time-dependent properties of dielectric and piezoelectric materials in humid environments are an important performance metric, as humidity-related degradation can dominate device lifetime in some applications. This research aims to understand the effects of proton incorporation in such environments by examining the diffusion kinetics of H+ in commercially relevant electroceramic systems. The work focuses on in-situ impedance measurements and tracer diffusion studies to examine incorporation pathways, mechanisms, and kinetics of H+ in BaTiO3. Specifically, the hydration kinetics for acceptor doped BaTiO3 will be shown as a function of temperature and acceptor concentration. Furthermore, an interpretation of a potential mechanism for the pH2O dependent conductivity in BaTiO3 will be examined. Our hypothesis regarding the hydration mechanism will be supported by secondary ion mass spectrometry (SIMS) studies on D2O hydrated polycrystalline BaTiO3. This work was funded by the Center for Dielectrics and Piezoelectric, an NSF Industry/University Cooperative Research Center, under grant IIP-1841466. |