| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Grain Boundaries, Interfaces, and Surfaces: Fundamental Structure-Property-Performance Relationships
|
| Presentation Title |
Charged Domains on the Surface of a Centrosymmetric Ferroelastic Crystal |
| Author(s) |
Ajay Pisat, Jackson Adler, Paul Salvador, Gregory S. Rohrer |
| On-Site Speaker (Planned) |
Gregory S. Rohrer |
| Abstract Scope |
BiVO4 adopts a centrosymmetric crystal structure at room temperature and is ferroelastic. The ferroelastic domains, however, have an electrostatic charge that leads to spatially selective photochemical reactivity. Here, we probe the properties of these domains above and below the ferroelasitic transition temperature. The results show that charged domains persist above the transition temperature. In addition, when the temperature is cycled above the transition temperature by only 15 °C, the domains disappear, but on cooling the domains reform with a structure similar to that before the thermal cycle. Higher temperature excursions lead to a completely different domain structure. The results indicate that charged point defect concentrations are modulated by the ferroelastic domains, create the charge in the domains and, during cooling, provides a template for the nucleation and growth of a domain structure that resembles the original structure. |