Title :
Modeling the dielectric response in relaxor ferroelectrics
Author :
Kuchta, B. ; Debierre, J.-M.
Author_Institution :
Inst. of Phys. & Theor. Chem., Wroclaw Univ. of Technol., Poland
fDate :
6/1/2001 12:00:00 AM
Abstract :
A two-state thermodynamic model of ferroelectric materials exhibiting relaxor properties is proposed. One state represents ferroelectric properties with a ferroelectric-paraelectric transition. The second one is relaxor-like, with vanishing macroscopic polarization and diffusive onset of local cluster polarization. The model is able to reproduce qualitatively the dielectric susceptibility both for materials with phase transition into the ferroelectric phase, and for ones remaining only incipient ferroelectric with high permittivity. Examples of dielectric responses have been calculated. They model the situations in pure relaxor, pure ferroelectric as well as in some mixed cases
Keywords :
dielectric polarisation; dielectric relaxation; ferroelectric materials; ferroelectric transitions; optical susceptibility; permittivity; thermodynamic properties; dielectric response; dielectric susceptibility; ferroelectric materials; ferroelectric-paraelectric transition; high permittivity; incipient ferroelectric; local cluster polarization; macroscopic polarization; relaxor ferroelectrics; two-state thermodynamic model; Dielectric materials; Equations; Ferroelectric materials; Fluctuations; Frequency; Niobium; Permittivity; Polarization; Relaxor ferroelectrics; Temperature dependence;
Journal_Title :
Dielectrics and Electrical Insulation, IEEE Transactions on
