Open AccessRandom field effect of polarization and dielectric permittivity in ferroelectric transitions
Author(s) -
Gan Yong-Chao,
Wanqiang Cao
Publication year - 2013
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.62.127701
Subject(s) - condensed matter physics , electric susceptibility , electric field , polarization density , ferroelectricity , permittivity , dielectric , polarization (electrochemistry) , dipole , materials science , electric dipole transition , physics , random field , magnetic dipole , magnetization , magnetic field , quantum mechanics , chemistry , statistics , mathematics
Based on reversion motion of dipoles in ferroelectrics under the electric field in the random field Ising model, the relationship between electric field and polarization in order-disorder transition is investigated, and the function tanh(x) for the electric field in order-disorder transition is coincident with the experimental relationship between electric field and polarization in the second order ferroelectric transition. Therefore, increases in polarization and internal poling field are due to the collective motion of dipoles, where electric field and temperature are critical in the polarization and Gibbs free energy. By distinguishing the contributions between optic mode and polarization portion with a gaussian-type distribution of Curie-temperature, and considering a complex dispersion form of dielectric permittivity contributed by dipoles, the relationships between dielectric permittivity and temperature, as well as frequency, are derived.