解构钨青铜氧化物之铁电相变与介电特性演化规律  

Evolution of Ferroelectric Transition and Dielectric Properties in Tungsten Bronze Oxides

作　　者：朱晓莉[1] 陈湘明[1] ZHU Xiaoli;CHEN Xiangming(Institute of Materials Physics,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]浙江大学材料物理研究所,杭州310027

出　　处：《硅酸盐学报》2021年第4期605-607,共3页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(51961145105)。

摘　　要：梳理了钨青铜氧化物铁电相变与介电特性的演化规律,构筑了调制结构对其铁电相变与宏观铁电性能影响的物理图像.A位离子通过对氧八面体倾转的影响使晶体形成不同的调制结构,而调制结构自无公度向公度的转变与铁电相变温度的相互关系、决定了钨青铜氧化物由正常铁电体向弛豫铁电体的演化.低温下调制结构逐渐退出,而调制结构退出过程中与铁电序的相互作用应是钨青铜氧化物中普遍存在的低温介电弛豫的结构起源.In the present perspective,evolution of ferroelectric transition and dielectric properties in tungsten bronze oxides is surveyed,and the physical image of modulation structure is established to interpret the variation of ferroelectric transition and macro ferroelectric properties.Different A site cations lead to different modulation structure,and the relationship between temperatures of modulation structure change and ferroelectric transition dominates the crossover from normal to relaxor ferroelectric in tungsten bronze oxides.At low temperature,modulation structure will lock into a regular space group,while the interactions between modulation structure and ferroelectric order results in the low temperature dielectric relaxations.

关 键 词：钨青铜铁电陶瓷 铁电相变 介电性能 调制结构 

分 类 号：TQ174.13[化学工程—陶瓷工业]