Relaxor Behavior and Morphotropic Phase Boundary in a Simple Model
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概要
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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.
- 2013-06-15
著者
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Kato Takeo
Institute For Solid State Physics The University Of Tokyo
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Tomita Yusuke
Shibaura Institute of Technology, Saitama 337-8570, Japan
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