摘要
After analyzing the characteristics of interactions between the polar microregions in the complex perovskite relaxor ferroelectrics, a physical model is built up in which the effective interaction energy parameters have a Gaussian distribution. The dielectric mechanism of the materials is studied by using the Monte Carlo computer simulation. The concepts of "frozen dipole" and "slow dipole" are proposed according to the distribution of relaxation time of dipole flipping, the diffuse phase transition (DPT), frequency dispersion and polarization behavior, and other relaxor properties are explained systematically. It is proposed that the relaxor characteristics are caused by the ergodic space shrinking in succession, which arises from the inhomogeneous crystal structure of this kind of material.
After analyzing the characteristics of interactions between the polar microregions in the complex perovskite relaxor ferroelectrics, a physical model is built up in which the effective interaction energy parameters have a Gaussian distribution. The dielectric mechanism of the materials is studied by using the Monte Carlo computer simulation. The concepts of “frozen dipole” and “slow dipole” are proposed according to the distribution of relaxation time of dipole flipping, the diffuse phase transition (DPT), frequency dispersion and polarization behavior, and other relaxor properties are explained systematically. It is proposed that the relaxor characteristics are caused by the ergodic space shrinking in succession, which arises from the inhomogeneous crystal structure of this kind of material.
基金
ProjectsupportedbytheNationalNaturalScienceFoundationofChina (GrantNo .5 95 72 0 36 )
