无机材料学报2012，Vol.27Issue(11)：1228-1232,5.DOI:10.3724/SP.J.1077.2012.12325
铁酸镧掺杂对铌酸钾钠基陶瓷介电和铁电性能的影响
Effects of LaFeO3 Additions on the Dielectric and Ferroelectric Properties of (K0.5Na0.5)NbO3 Ceramics
摘要
Abstract
Pure (K0.5Na0.5)NbO3 and 0.98(K0.5Na0.5)NbO3-0.02LaFeO3 ceramics (abbreviated as KNN and 0.98KNN-0.02LF,respectively) were prepared by a solid state reaction approach,and their crystal structure,dielectric and ferroelectric properties were investigated.Pure KNN and 0.98KNN-0.02LF ceramics are the orthorhombic structure and pseudo-cubic perovskite structure,respectively.Dielectric measurements revealed that the dielectric permittivity curves of 0.98KNN-0.02LF ceramics present two anomalies compared with pure KNN:(i) The orthorhombictetragonal transition (To-T) and the tetragonal-cubic transition (TT-c) shifts to lower temperatures.(ii) The phase transition temperature range around the temperature of the maximum dielectric permittivity (Tm) becomes more and more broad.In addition,0.98KNN-0.02LF ceramics exhibited a very stable temperature dependence of dielectric permittivity with permittivity maximum near 2000 and dielectric loss less than 4％ in the temperature range of 0-400℃.The relaxation behavior of the 0.98KNN-0.02LF ceramics is interpreted in terms of polar nanoregions (PNRs) caused by cations disorder.The P-E hysteresis loops further confirms the relaxor behavior in 0.98KNN-0.02LF ceramics.关键词
铌酸钾钠/介电性能/铁电性能/弛豫性质/无铅陶瓷Key words
(K0.5Na0.5)NbO3/ dielectric properties/ ferroelectric properties/ relaxor properties/ lead-free ceramics分类
信息技术与安全科学引用本文复制引用
程花蕾,杜红亮,周万城,罗发,朱冬梅..铁酸镧掺杂对铌酸钾钠基陶瓷介电和铁电性能的影响[J].无机材料学报,2012,27(11):1228-1232,5.基金项目
Doctorate Foundation of Northwestern Polytechnical University (CX201108) （CX201108）
National Natural Science Foundation of China (51072165) （51072165）
State Key Laboratory of Solidification Processing in NWPU (KP200901) （KP200901）
