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 |
|---|---|
| Article number | 063002 |
| Journal | Journal of the Physical Society of Japan |
| Volume | 82 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - 2013 Jun |
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Keywords
- Dielectric response
- Domain structure
- Monte carlo simulation
- Morphotropic phase boundary
- Relaxors
ASJC Scopus subject areas
- Physics and Astronomy(all)
Cite this
Relaxor behavior and morphotropic phase boundary in a simple model. / Tomita, Yusuke; Kato, Takeo.
In: Journal of the Physical Society of Japan, Vol. 82, No. 6, 063002, 06.2013.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Relaxor behavior and morphotropic phase boundary in a simple model
AU - Tomita, Yusuke
AU - Kato, Takeo
PY - 2013/6
Y1 - 2013/6
N2 - 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.
AB - 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.
KW - Dielectric response
KW - Domain structure
KW - Monte carlo simulation
KW - Morphotropic phase boundary
KW - Relaxors
UR - http://www.scopus.com/inward/record.url?scp=84878900258&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84878900258&partnerID=8YFLogxK
U2 - 10.7566/JPSJ.82.063002
DO - 10.7566/JPSJ.82.063002
M3 - Article
VL - 82
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - 6
M1 - 063002
ER -