摘要
为研究铋层状钙钛矿结构(Aurivillius相)铁电陶瓷居里温度(Tc)及介电性能,采用传统固相反应法在1 100℃烧结5 h制备了不同价态元素K^+、Ba^(2+)、Y^(3+)协同置换A位Sr元素的Sr_(1-x)(YK)_(0.25x)Ba_(0.5x)Bi_4Ti_4O_(15)陶瓷,利用X射线衍射仪表征不同置换量陶瓷的物相,结果表明制备的陶瓷均为Aurivillius相,无杂相产生。采用精密阻抗分析仪测量了陶瓷在不同频率下的介电温谱,结果表明,所有陶瓷样品均表现出铁电相变,随替换量增多,陶瓷的居里温度T_c由518.2℃降低到514.5℃,T_c处的介电常数极大值由2 350下降到2 000。研究结果表明,表征结构失稳性的容忍因子参数对Sr_(1-x)(YK)_(0.25x)Ba_(0.5x)Bi_4Ti_4O_(15)陶瓷铁电相变有重要影响。
To study the impacting factors of the ferroelectric Curie temperature（Tc）and dielectric properties ofbismuth layered perovskite-type ferroelectric ceramics,K＋,Ba2＋ and Y3＋ co-substituted SrBi4Ti4O15 ceramics（Sr1-x（YK）0.25xBa0.5xBi4Ti4O15）were synthesized by conventional solid state reaction at 1100 ℃ for 5 h. X-raydiffraction results showed that all the ceramics were single phase without impurity. The dielectric temperaturespectrum measured by precision impedance analyzer showed a ferroelectric transition for all samples,Tc decreasing from 518.2 ℃ to 514.5 ℃ and the dielectric constant at Tc decreasing from 2 350 to 2 000 asthe amount of elemental substitution（x） increased. The tolerance factor characterizating structuralinstability of bismuth layered perovskite structure plays an important role in the ferroelectric phase transitionin the Sr1-x（YK）0.25xBa0.5xBi4Ti4O15 ceramics.
作者
骆建国
朱蒙
龙春艳
徐军
LUO Jianguo;ZHU Meng;LONG Chunyan;XU Jun(School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan 430205, China;Hubei Key Laboratory of Plasma Chemical and Advanced Materials （Wuhan Institute of Technology）, Wuhan 430205, China)
出处
《武汉工程大学学报》
CAS
2018年第3期288-291,共4页
Journal of Wuhan Institute of Technology
基金
武汉工程大学第八届研究生教育创新基金(CX2016022)
