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Li含量对KNNLTSBZ无铅压电陶瓷性能的影响
作者:李月明1 吴芬1 潘铁政2 沈宗洋1 王竹梅1 肖祖贵1 
单位:1.景德镇陶瓷学院材料科学与工程学院 江西景德镇333403  2.昆山攀特电陶科技有限公司 江苏昆山215300 
关键词:铌酸钾钠 无铅压电陶瓷 多型相变 电性能 
分类号:TQ174
出版年,卷(期):页码:2014,42(1):1-5
DOI:10.7521/j.issn.0454-5648.2014.01.1
摘要:

采用传统固相法制备了(K0.49Na0.51)1-xLix(Nb0.77Ta0.18Sb0.05)O3-0.005BaZrO3(x0.020.06KNNLTSBZx)无铅压电陶瓷。用X射线衍射、扫描电子显微镜及精密阻抗分析仪分析了Li含量(x)对样品的晶相组成、显微结构、压电及介电性能的影响。发现:所研究的组成范围内,陶瓷样品均具有纯的钙钛矿晶体结构;随着Li含量(x)的增加,室温样品的晶体结构由正交相逐渐向四方相转变,Curie温度(TC)向高温方向移动,而正交-四方相变温度(To-t)则向低温方向变化,且当x0.04时,To-t已经移到室温以下,0.04x0.06范围为陶瓷的正交-四方共存的多型相转变组成,当x0.04时,陶瓷具有最佳的压电、介电性能:压电常数d33240pC/N,平面机电耦合系数kp44.7%,相对介电常数ε/ε02090,介电损耗tanδ2.7%

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(K0.49Na0.51)1-xLix(Nb0.77Ta0.18Sb0.05)O3-0.005BaZrO3(x=0.02-0.06,abbreviatedKNNLTSBZx) lead-free piezoelectric ceramics were prepared by a conventional solid state reaction method.The effect of Li amount on the phase,microstructure,piezoelectric properties and dielectric properties of samples was analyzed by X-ray diffraction,scanning electron microscopy and precision impedance analysis, respectively.The results show that all the samples possess a pure perovskite structure.When the amount of Li increases, the phase structure of the samples at room temperature changes from orthorhombic to tetragonal symmetry, the Curie temperature TC moves to a higher temperature,but orthorhombic-tetragonal phase transition temperature To-t moves to a lower temperature, even moves to the temperature below room temperatureasx≥0.04.Inaddition, a polymorphic phase transition from orthorhombic to tetragonal symmetry occurs in the composition range of 0.04≤x≤0.06.The ceramic samples in the composition when x=0.04 have optimal electrical properties, ie., piezoelectric constant (d33) of 240 pC/N, planar electromechanical coefficient (kp) of 44.7%, relative dielectric constant (ε/ε0) of 2090, and dielectric loss (tanδ) of 2.7%.
基金项目:
国家自然科学基金(51262011,50962007);江西省自然科学基金(20114BAB206023,20132BAB206016);江西省主要学科学术和技术带头人培养计划(2010DD01100);江西省教育厅青年科学基金项目(GJJ12508)。
作者简介:
第一作者:李月明(1965-),男,博士,教授。 Received date:2013-06-18. Revised date:2013-09-03. First author: LI Yueming(1965-),male,Ph.D.,Professor. E-mail: lym6329@163.com
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