Abstract
A simple model to reproduce the strong enhancement of the dielectric response near the morphotropic phase boundary (MPB) is proposed. This model consists of a long-range dipole-dipole interaction and compositional chemical disorder incorporated by the variation in lengths of dipole moments. By applying a Monte Carlo simulation, we show that a ferroelectric boundary phase appears between an antiferroelectric phase and a relaxor ferroelectric phase at an optimal strength of randomness. In the boundary phase, the ferroelectric domain becomes extremely large and flexible to external electric fields, leading to a huge dielectric response. This observation indicates that the huge dielectric response near the MPB originates from local polarization rotation under the suppression of anisotropy by phase competition.
Original language | English |
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Article number | 063002 |
Journal | journal of the physical society of japan |
Volume | 82 |
Issue number | 6 |
DOIs | |
Publication status | Published - 2013 Jun |
Keywords
- Dielectric response
- Domain structure
- Monte carlo simulation
- Morphotropic phase boundary
- Relaxors
ASJC Scopus subject areas
- Physics and Astronomy(all)