铁酸镧掺杂对铌酸钾钠基陶瓷介电和铁电性能的影响

doi:10.3724/SP.J.1077.2012.12325

无机材料学报 ›› 2012, Vol. 27 ›› Issue (11): 1228-1232.DOI: 10.3724/SP.J.1077.2012.12325

• 研究快报 • 上一篇

铁酸镧掺杂对铌酸钾钠基陶瓷介电和铁电性能的影响

程花蕾, 杜红亮, 周万城, 罗发, 朱冬梅

(西北工业大学材料科学与工程学院, 凝固技术国家重点实验室, 西安 710072)

收稿日期:2012-05-18 修回日期:2012-06-06 出版日期:2012-11-20 网络出版日期:2012-10-25
基金资助:
Doctorate Foundation of Northwestern Polytechnical University (CX201108); National Natural Science Foundation of China (51072165); State Key Laboratory of Solidification Processing in NWPU (KP200901)

Effects of LaFeO₃ Additions on the Dielectric and Ferroelectric Properties of (K_0.5Na_0.5)NbO₃ Ceramics

CHENG Hua-Lei, DU Hong-Liang, ZHOU Wan-Cheng, LUO Fa, ZHU Dong-Mei

(State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China)

Received:2012-05-18 Revised:2012-06-06 Published:2012-11-20 Online:2012-10-25
Supported by:
Doctorate Foundation of Northwestern Polytechnical University (CX201108); National Natural Science Foundation of China (51072165); State Key Laboratory of Solidification Processing in NWPU (KP200901)

摘要/Abstract

摘要： 用传统固相反应法制备了(K_0.5Na_0.5)NbO₃(KNN)和0.98(K_0.5Na_0.5)NbO₃-0.02LaFeO₃(0.98KNN-0.02LF)无铅陶瓷, 并对其介电、铁电性质以及相结构进行了研究. KNN陶瓷是正交相, 0.98KNN-0.02LF陶瓷是伪立方相结构. 介电研究表明: 0.98KNN-0.02LF 陶瓷的介温曲线与KNN陶瓷相比较出现两点异常: (i)正交相–四方相相变温度(T_O-T)和四方相–立方相相变温度(T_T-C)均降低; (ii)最高介电常数温度T_m附近的相变温度宽化. 并且, 0.98KNN-0.02LF陶瓷在0~400℃内显示了相对比较平坦的介电常数, 介电常数达到2000, 介电损耗低于4%. 电滞回线变“窄”进一步证明了0.98KNN-0.02LF陶瓷的弛豫性.

关键词: 铌酸钾钠, 介电性能, 铁电性能, 弛豫性质, 无铅陶瓷

Abstract: Pure (K_0.5Na_0.5)NbO₃ and 0.98(K_0.5Na_0.5)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 orthorhombic- tetragonal transition (T_O-T) and the tetragonal-cubic transition (T_T-C) shifts to lower temperatures. (ii) The phase transition temperature range around the temperature of the maximum dielectric permittivity (T_m) 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.

Key words: (K_0.5Na_0.5)NbO₃, dielectric properties, ferroelectric properties, relaxor properties, lead-free ceramics

中图分类号:

TM282

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.

CHENG Hua-Lei, DU Hong-Liang, ZHOU Wan-Cheng, LUO Fa, ZHU Dong-Mei. Effects of LaFeO₃ Additions on the Dielectric and Ferroelectric Properties of (K_0.5Na_0.5)NbO₃ Ceramics[J]. Journal of Inorganic Materials, 2012, 27(11): 1228-1232.

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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 (K_0.5Na_0.5)NbO₃ Ceramics

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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

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Effects of LaFeO₃ Additions on the Dielectric and Ferroelectric Properties of (K_0.5Na_0.5)NbO₃ Ceramics