Influence of La3+ Doping on Structure and Electrical Properties of CaBi2Nb2O9 Piezoceramics

被引：0

作者：

Huang L. ^{[1
]}

Jiang X. ^{[1
]}

Chen C. ^{[1
]}

Huang X. ^{[1
]}

Nie X. ^{[1
]}

Xu J. ^{[1
]}

Wang H. ^{[1
]}

Jiang Z. ^{[1
]}

机构：

[1] Jiangxi Key Laboratory of Advanced Ceramic Materials, Department of Material Science and Engineering, Jingdezhen Ceramic Institude, Jingdezhen

来源：

Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | 2021年 / 49卷 / 04期

关键词：

CaBi[!sub]2[!/sub]Nb[!sub]2[!/sub]O[!sub]9[!/sub; Conductive mechanism; Dielectric properties; Ferroelectric properties; Microstructure; Piezoceramics;

D O I：

10.14062/j.issn.0454-5648.20200827

中图分类号：

学科分类号：

摘要：

La3+-doped Ca1-xLaxBi2Nb2O9(CBN-xLa, x=0.00, 0.02, 0.04, 0.06, 0.08, 0.10) piezoceramics were synthesized by a solid-state reaction method. The crystal structure, microstructure, dielectric, piezoelectric and ferroelectric properties as well as high-temperature conductive mechanism of La3+-doped CBN ceramics were investigated. The results show that an appropriate amount of La3+ donor ion substituted for Ca2+ ion can optimize the crystal structure, decrease the grain size, reduce the oxygen vacancy, and effectively improve the electrical properties of CBN ceramics. The Ca0.92La0.08Bi2Nb2O9 ceramics with the optimal performance (high piezoelectric coefficient (d33=11.7 pC/N) and the Curie temperature (TC=905℃), remanent polarization (2Pr=9.51 μC/cm2) and low dielectric loss, (tanδ=3.87% at 550℃)). After annealing, the piezoelectric properties of all the samples remain stable at 800 ˚C. According to the complex impedance plots, the grain boundary and grain both contribute the impedance, and the conduction mechanism is closely related to oxygen vacancies. Moreover, La3+-doping can effectively improve the resistivity of CBN ceramics at high temperatures, indicating a potential application in high-temperature sensors. © 2021, Editorial Department of Journal of the Chinese Ceramic Society. All right reserved.

引用

页码：648 / 658

页数：10

共 40 条

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