| Bi0.5(Na0.82-xK0.18Lix)0.5TiO3无铅压电陶瓷的微结构与电性能 |
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| 引用本文： | 元德侃,周沁,朱夏雨,岑侦勇,廖童佳.Bi0.5(Na0.82-xK0.18Lix)0.5TiO3无铅压电陶瓷的微结构与电性能[J].电工材料,2012(2):46-50. |
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| 作者姓名： | 元德侃 周沁 朱夏雨 岑侦勇 廖童佳 |
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| 作者单位： | 桂林电子科技大学材料科学与工程学院,桂林541004 |
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| 基金项目： | 2009年国家级大学生创新性实验项目(ZCC0123);广西教育厅重点项目(201012MS083);广西自然科学基金(2010GXNSFB013010) |
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| 摘 要： | 采用传统陶瓷制备工艺制备了Bi0.5(Na0.82-xK0.18Lix)0.5]TiO3(x=0.01~0.07)无铅压电陶瓷.研究了该体系陶瓷的微结构以及应力对平面机电耦合系数kp和压电常数d33的影响.结果表明,Bi0.5(Na0.82-xK0.18Lix)0.5]TiO3无铅压电陶瓷具有单一钙钛矿结构,Li+有抑制晶粒长大的作用.当x=0.03时,压电陶瓷样品表现出优良的压电性能:压电常数d33和平面机电耦合系数kp分别为154 pC/N和0.296.同时发现,退火可消除内应力,有利于提高d33,但会使kp减小;极化会引起介电常数εr减小,电畴转向过程中产生的应力对d33影响较为明显
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| 关 键 词： | 压电性能 压电常数 机电耦合系数 应力 电畴 |
Microstructure and Properties of Bi0.5(Na0.82-xK0.18Lix)0.5TiO3 Lead-free Piezoelectric Ceramics |
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| YUAN De-kan,ZHOU Qin,ZHU Xia-yu,CEN Zhen-yong,LIAO Tong-jia.Microstructure and Properties of Bi0.5(Na0.82-xK0.18Lix)0.5TiO3 Lead-free Piezoelectric Ceramics[J].Electrical Engineering Materials,2012(2):46-50. |
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| Authors: | YUAN De-kan ZHOU Qin ZHU Xia-yu CEN Zhen-yong LIAO Tong-jia |
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| Affiliation: | (School of Materials Science and Engineering,Guilin University of Electronic Technology,Guangxi Guilin 541004,China) |
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| Abstract: | The lead-free piezoelectric ceramic Bi0.5(Na0.82-xK0.18Lix)0.5]TiO3(x=0.01~0.07) was prepared by conventional ceramic sintering technique.The influence of microstructure and stress on piezoelectric properties of the ceramic was investigated.Results show that the lead-free piezoelectric ceramic Bi0.5(Na0.82-xK0.18Lix)0.5]TiO3 has a pure perovskite structure and Li+ inhibits the growth of grain.The piezoelectric ceramic samples show good piezoelectric properties when x=0.03: piezoelectric constant d33and electromechanical coupling coefficient kpis 154 pC/N and 0.296 respectively.Furthermore,it is found that annealing could eliminate stress and help to improve the piezoelectric constant d33,but decrease the electromechanical coupling coefficient kp.Polarization will cause dielectric constant εr to decreas and the stress caused by the reorientation of the domain has a obvious influence on d33. |
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| Keywords: | piezoelectric properties piezoelectric constant electromechanical coupling coefficient stress domain |
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