物理学报2012，Vol.61Issue(17)：508-512,5.
核壳结构对弛豫铁电体介电行为的影响
Influence of core-shell structure on dielectric behaviour in relaxor ferroelectrics
摘要
Abstract
Dominant features of relaxor ferroelectrics are dielectric dispersion and the nonlinear relationship between reciprocal dielectric constant and temperature. The result of the analysis of the thenaaal dynamic function for core-shell structure in a grain shows that the core-shell structure doped with dopant in linear gradient descending ingredients can remain high dielectric constant at low temperatures, but cannot lead to the nonlinear relationship between reciprocal dielectric constant and temperature. By comparing diffusion transitions with different doping ingredients, it is suggested that the concentration of ingredient will affect the inhomogeneity of the doping ingredient. A wide distribution of the ingredient between grains by high doping concentration will result in the nonlinear relationship between reciprocal dielectric constant and temperature, and therefore the coexistence of grains in paraelectric phase and in ferroelectric phase in the peak area of dielectric constant. The change of measurement temperature will affect the ratio of the grains in two phases and the change in ferroelectric domains, which results in ferroelectric dielectric dispersion. The core-shell structure will increase the dielectric dispersion. Ferroelectric ceramics, doping species and their concentrations, and sintering temperature all can influence the inhomogeneity of core-shell structure and dielectric dispersion.关键词
核壳结构/铁电相变/铁电弛豫Key words
relaxor ferroelectrics/core-shell structure/dielectric dispersion分类
化学化工引用本文复制引用
舒明飞,尚玉黎,陈威,曹万强..核壳结构对弛豫铁电体介电行为的影响[J].物理学报,2012,61(17):508-512,5.基金项目
功能材料绿色制备与应用省部共建教育部重点实验室 （）
