| About this Abstract |
| Meeting |
MS&T23: Materials Science & Technology
|
| Symposium
|
Mesoscale Phenomena in Functional Polycrystals and Their Nanostructures
|
| Presentation Title |
Modeling Local Dielectric Dispersion in Ferroelectric BaTiO3 with Domain Walls |
| Author(s) |
Ashok Gurung, John Mangeri , Charles Schwarz, S Pamir Alpay, Serge Nakhmanson |
| On-Site Speaker (Planned) |
Ashok Gurung |
| Abstract Scope |
BaTiO3 (BTO) is a prototypical ferroelectric and a component in related relaxor dielectric materials. The dielectric permittivity and loss in BTO depend strongly on the response of the domain walls (DWs) to an applied electric field. We studied the DWs influence on the field-frequency and temperature dependent dielectric behavior of BTO using a phase-field modeling approach combined with finite element method computations. For BTO with 180-degree DWs, position-resolved and integral dielectric permittivity and loss were evaluated, showing that the dipole switching dynamics highly sensitive to position within the polydomain structure. The magnitude of the dielectric response and the nature of the dipole field relaxation change dramatically when moving from the domain center into the vicinity of the DW. The implications of this behavior are important for improved control of coupled functional properties of perovskite dielectrics.
Distribution A. Approved for public release: distribution unlimited. (AFRL- 2023-1598) Date Approved 04-
06-2023. |