CaxSr1-xBi2Nb2O9无铅压电陶瓷制备及其高温稳定性研究

doi:10.15541/jim20150068

无机材料学报 ›› 2015, Vol. 30 ›› Issue (9): 989-994.DOI: 10.15541/jim20150068 CSTR: 32189.14.10.15541/jim20150068

Ca_xSr_1-_xBi₂Nb₂O₉无铅压电陶瓷制备及其高温稳定性研究

姚忠冉¹, 初瑞清¹, 徐志军¹, 郝继功¹, 李国荣²

(1. 聊城大学材料科学与工程学院, 聊城252059; 2. 中国科学院上海硅酸盐研究所, 上海200050)

收稿日期:2015-02-01 修回日期:2015-04-02 出版日期:2015-09-20 网络出版日期:2015-08-19
作者简介:姚忠冉(1991–), 男, 硕士研究生. E-mail: yaozr05130928@163.com
基金资助:
国家自然科学基金( 51372110, 51402144, 51302124);国家高技术研究发展计划(863计划, 2013AA030801);山东省自然科学基金(ZR2012EMM004, ZR2012AL06);广东省科技计划(2013B091000001);山东省自主创新及成果转化专项(2014CGZH0904);山东省高等学校科技计划项目(J14LA10, J14LA11), 聊城大学研究基金(318011301, 318011306)

Preparation and High Temperature Stability of Ca_xSr_1-_xBi₂Nb₂O₉ Lead-free Piezoelectric Ceramics

YAO Zhong-Ran¹, CHU Rui-Qing¹, XU Zhi-Jun¹, HAO Ji-Gong¹, LI Guo-Rong²

(1. College of Materials Science and Engineering, Liaocheng University, Liaocheng 252059, China; 2. Shanghai Institute of Ceramics, Chinese Academy of Science, Shanghai 200050, China)

Received:2015-02-01 Revised:2015-04-02 Published:2015-09-20 Online:2015-08-19
About author:YAO Zhong-Ran. E-mail: yaozr05130928@163.com
Supported by:
National Natural Science Foundation of China (51372110, 51402144, 51302124);National High Technology Research and Development Program of China (2013AA030801);Natural Science Foundation of Shandong Province of China (ZR2012EMM004, ZR2012AL06);Science and Technology Planning Project of Guangdong Province, China (2013B091000001);Independent innovation and achievement transformation in Shandong Province special, China (2014CGZH0904);Project of Shandong Province Higher Educational Science and Technology Program(J14LA10, J14LA11);Research Foundation of Liaocheng University (318011301, 318011306)

摘要/Abstract

摘要：

采用传统固相法制备了Ca_xSr_1-_xBi₂Nb₂O₉(x=0、0.10、0.25、0.40)无铅压电陶瓷, 研究了Ca²⁺掺杂量对其微观结构、电学性能及其高温稳定性的影响。掺入Ca²⁺并未改变SrBi₂Nb₂O₉陶瓷的晶体结构; 随着Ca²⁺掺杂量的增加, 陶瓷晶粒由片状向长条状转变; 陶瓷的矫顽场(E_c)下降, 剩余极化强度(P_r)先增大后减小; 陶瓷的居里温度由450℃升高到672℃。当x=0.10时, 陶瓷具有较好的综合性能: 2P_r=14.8 μC/cm², d₃₃=22 pC/N, T_c=488℃; 当退火温度达到400℃时, 压电常数d₃₃仍达到20 pC/N, 说明该材料具有较好的温度稳定性, 可以在400℃的高温环境中应用。

关键词: 陶瓷, Ca2+掺杂, CaxSr1-xBi2Nb2O9, 电学性能

Abstract:

Ca_xSr_1-_xBi₂Nb₂O₉ (x=0, 0.10, 0.25, 0.40) ceramics were prepared by solid-state reaction method, and their microstructure, electrical and temperature stability properties were systematically investigated. It is found that Ca-doping does not change the phase structure of SrBi₂Nb₂O₉. With increasing Ca²⁺ contents, microstructure of the Ca_xSr_1-_xBi₂Nb₂O₉ceramics changes from sheet to long strips. The remnant polarization (P_r) increases firstly and then decreases, reaching the maximum value at x=0.01, while the coercive field (E_c) decreases gradually. Furthermore, Ca-doping can also improve the Curie temperature, which increases from 450℃ to 672℃ with increase of Ca²⁺ contents. The optimum electrical properties can be obtained at x=0.10 as 2P_r=14.8 μC/cm², d₃₃=22 pC/N and T_c=488℃. In addition, after annealing at 400℃, the piezoelectric constant (d₃₃) of the ceramics remains 20 pC/N, showing good temperature stability for high temperature applications.

Key words: ceramic, Ca2+-doping, CaxSr1-xBi2Nb2O9, electrical properties

中图分类号:

TM282

姚忠冉, 初瑞清, 徐志军, 郝继功, 李国荣. Ca_xSr_1-_xBi₂Nb₂O₉无铅压电陶瓷制备及其高温稳定性研究[J]. 无机材料学报, 2015, 30(9): 989-994.

YAO Zhong-Ran, CHU Rui-Qing, XU Zhi-Jun, HAO Ji-Gong, LI Guo-Rong. Preparation and High Temperature Stability of Ca_xSr_1-_xBi₂Nb₂O₉ Lead-free Piezoelectric Ceramics[J]. Journal of Inorganic Materials, 2015, 30(9): 989-994.

图/表 6

图1 CaxSr1-xBi2Nb2O9 (1100℃/2 h)陶瓷样品的XRD谱图

Fig. 1 XRD patterns of CaxSr1-xBi2Nb2O9 ceramics sintered at 1100℃ for 2 h

图2 CaxSr1-xBi2Nb2O9 (1100℃/2 h)陶瓷断面的SEM照片

Fig. 2 SEM images of the fracture surface microstructure for CaxSr1-xBi2Nb2O9 ceramics sintered at 1100℃ for 2 h

图3 CaxSr1-xBi2Nb2O9陶瓷样品在10 kHz测试频率下的介温图谱和介电损耗tanδ

Fig. 3 Temperature dependence and dielectric loss tanδ of dielectric response at 10 kHz for CaxSr1-xBi2Nb2O9 ceramics nset is the relation between Tc and x

图4 180℃下CaxSr1-xBi2Nb2O9陶瓷样品的电滞回线和电流曲线

Fig. 4 Ferroelectric P-E hysteresis and I-E loops of CaxSr1-xBi2Nb2O9 ceramics (180℃)

图5 CaxSr1-xBi2Nb2O9陶瓷剩余极化强度2Pr和矫顽场强Ec与x的关系

Fig. 5 Remnant polarization (Pr) and coercive field (Ec) of CaxSr1-xBi2Nb2O9 ceramics as a function of x

图6 CaxSr1-xBi2Nb2O9陶瓷压电常数(d33)与退火温度(T)的关系

Fig. 6 Relationship between piezoelectric constant (d33) and heat treatment temperature (T) of the CaxSr1-xBi2Nb2O9 ceramics

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Ca_xSr_1-_xBi₂Nb₂O₉无铅压电陶瓷制备及其高温稳定性研究

Preparation and High Temperature Stability of Ca_xSr_1-_xBi₂Nb₂O₉ Lead-free Piezoelectric Ceramics

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