Effect of Li amount on properties of KNNLTSBZ lead-free piezoelectric ceramics

被引：0
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作者：
机构：
[1] School of Materials Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333403, Jiangxi
[2] Kunshan PANT Piezoelectric Technology Corporation Limited, Kunshan 215300, Jiangsu
来源：
Li, Y. (lym6329@163.com) | 1600年 / Chinese Ceramic Society卷 / 42期
关键词：
Electrical properties; Lead-free piezoceramics; Polymorphic phase transition; Potassium sodium niobate;
D O I：
10.7521/j.issn.0454-5648.2014.01.1
中图分类号：
学科分类号：
摘要：
(K0.49Na0.51)1-xLix (Nb0.77Ta0.18Sb0.05)O3- 0.005BaZrO3(x=0.02-0.06, abbreviated KNNLTSBZx) lead-free piezoelectric ceramics were prepared by a conventional solid state reaction method. The effect of Li amount on the phase, micro-structure, 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 temperature as x≥0.04. In addition, 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, i. e., piezoelectric constant (d33) of 240 pC/N, planar electromechanical coefficient (kp) of 44.7%, relative dielectric constant (ε33T/ε0) of 2090, and dielectric loss (tanδ) of 2.7%.
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页码：1 / 5
页数：4
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