掺杂氧位Bi_(1.5)ZnNb_(1.5)O_7陶瓷结晶化学与介电性能  

Phase Structure,Crystal Chemistry and Dielectric Property of Oxygen-site Doped Bi_(1. 5)ZnNb_(1. 5)O_7 Ceramics

作　　者：丁士华[1] 彭勇[1] 王红妮[1] 宋天秀[1] 

机构地区：[1]西华大学材料科学与工程学院,四川成都610039

出　　处：《西华大学学报（自然科学版）》2014年第3期23-28,共6页Journal of Xihua University:Natural Science Edition

基　　金：国家自然科学基金(11074203);省教育厅基金(14ZB0126)

摘　　要：用F-替代氧离子O2-,采用固相反应法制备Bi1.5-xCaxZnNb1.5O7(0.00≤x≤0.30,简称C-x)、Bi1.5-x CaxZnNb1.5O7-yFy(0.00≤x≤0.20,简称CF-x)陶瓷样品,研究F-添加的缺陷补偿形式、替代位置,以及对Ca2+掺杂的Bi1.5ZnNb1.5O7(简称α-BZN)陶瓷的相结构、结晶化学和介电性能的影响。结果表明:F-的引入降低了Ca2+在α-BZN陶瓷的固溶度,替代八面体BO6的氧位;在等量Ca2+掺杂的情况下,引入F-进入体系后,样品的介电常数减小,介电损耗下降,这与F-引入α-BZN陶瓷后,四面体A4O'键价和比Ca2+单独掺杂时高一致;F-替代导致介电峰值温度均向高温移动,这可能与F-的添加导致激活能增加有关。By substituting F-for O2-,Bi1. 5-xCaxZnNb1. 5O7（ 0. 00≤x≤0. 30,abbreviated as C-x）,Bi1. 5-xCaxZnNb1. 5O7-yFy（ 0. 00≤x≤0. 20,abbreviated as CF-x） ceramics samples were prepared by conventional solid-state reaction method. The way of defect compensation,doping position substitution position,the influence of F-dopant on phase structure,crystal chemistry and dielectric properties of Ca-doped Bi1. 5ZnNb1. 5O7（ abbreviated as α-BZN） ceramics samples were investigated. The results revealed that F-incorporation declined the solid solution of Ca2 ＋in α-BZN,and F-was dissolved into the oxygen site of BO6octahedral. In the same amount of Ca2 ＋dopant,with F-incorporation,both the dielectric constant and the dielectric loss decreased,which was consistent to the bond valence sums for A4O＇. Compared with Ca2 ＋doping,the bond valence sums for A4O＇ of F-and Ca2 ＋co-doping increased. The shift of the dielectric constant peak to higher temperature could be associated with the increase in activation energy due to the addition of F-.

关 键 词：BI1 5ZnNb1 5O7陶瓷 键价理论 相结构 介电性能 

分 类 号：TQ174[化学工程—陶瓷工业]