2013/01/26 by Yusuke Tomita, Takeo Kato
Materials Science · Physics and Astronomy · #Dielectric properties of ceramics #Ferroelectric and Piezoelectric Materials #Solid-state spectroscopy and crystallography #cond-mat.mtrl-sci
paper · pdf · doi:10.7566/jpsj.82.063002
published as J. Phys. Soc. Jpn. 82, 063002 (2013) · 5 pages, 4 figures
arxiv created 2013/01/26 · openalex publication_date 2013/05/20 · arxiv updated 2013/05/21 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
A simple model to reproduce strong enhancement of dielectric response near the morphotropic phase boundary (MPB) is proposed. This model consists of long-range dipole-dipole interaction and compositional chemical disorder incorporated by the variation in lengths of dipole moments. By applying Monte Carlo simulation, we show that there appears a ferroelectric boundary phase between two types of antiferroelectric phases at an optimal strength of randomness. In the boundary phase, ferroelectric domain becomes remarkably large and flexible to external electric fields, leading to huge dielectric response. This observation indicates that huge dielectric response near the MPB originates from \it local polarization rotation under suppressed anisotropy by phase competition.