无铅压电陶瓷KNN常压烧结及其电学性能

doi:10.3724/SP.J.1077.2013.12659

无机材料学报 ›› 2013, Vol. 28 ›› Issue (9): 967-970.DOI: 10.3724/SP.J.1077.2013.12659 CSTR: 32189.14.SP.J.1077.2013.12659

无铅压电陶瓷KNN常压烧结及其电学性能

张东升¹, 田爱芬²

(1. 西安交通大学机械工程学院, 西安 710049; 2. 西安科技大学材料科学与工程学院, 西安 710054)

收稿日期:2012-11-01 修回日期:2012-12-28 出版日期:2013-09-20 网络出版日期:2013-08-14
作者简介:张东升(1974-), 男, 博士, 讲师. E-mail:zds@mail.xjtu.edu.cn
基金资助:
国家自然科学基金(51075321)

Electrical Properties of K_0.5Na_0.5NbO₃ Lead-free Piezoceramics by Pressureless Sintering

ZHANG Dong-Sheng¹, TIAN Ai-Fen²

(1. School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710049, China; 2. School of Materials Science and Egineering, Xi'an University of Science and Technology, Xi'an 710054, China)

Received:2012-11-01 Revised:2012-12-28 Published:2013-09-20 Online:2013-08-14
About author:ZHANG Dong-Sheng. E-mail:zds@mail.xjtu.edu.cn
Supported by:
National Natural Science Foundation of China (51075321)

摘要/Abstract

摘要： 用常压烧结法制备K_0.5Na_0.5NbO₃陶瓷。研究烧结温度与陶瓷密度和电学性能的关系。研究表明在1065℃~1120℃范围内, 温度对陶瓷的密度有显著影响。当烧结温度为1100℃时, 密度达到4.35 g/cm³ (占理论密度的95%); 1100℃烧结的陶瓷表现出最好的电学性能, 压电常数最大118 pC/N, 相对介电常数最大达538, 介电损耗最小仅4.7%, 剩余极化强度为15.37 μC/cm², 矫顽场为13.16 kV/cm。陶瓷样品在206℃从正交结构转变到四方结构, 居里温度为410℃。

关键词: 铌酸钾钠, 无铅压电陶瓷, 常压烧结

Abstract: Lead-free piezoceramics K_0.5Na_0.5NbO₃ were prepared by pressureless sintering. The effects of sintering temperature on the density and electrical properties of KNN ceramics were investigated. The results show that the density of the KNN ceramics changes dramatically in a narrow temperature range of 1065-1120℃. The density of the ceramic sintered at 1100℃ reaches 4.35 g/cm³ (95% of the theoretical density). The ceramic sintered at 1100℃ shows the best electrical properties: the maximum piezoelectric coefficient of about 118 pC/N, the maximum relative dielectric constant of 538, the minimum dielectric loss of 4.70%, the remanent polarization of 15.37 μC/cm² and the coercive electric field of 13.16 kV/cm. The phase transformation temperature from orthorhombic to tetragonal is about 206℃, and the Curie temperature is 410℃.

Key words: potassium sodium niobate ceramics, lead-free piezoceramic, pressureless sintering

中图分类号:

TM282

张东升, 田爱芬. 无铅压电陶瓷KNN常压烧结及其电学性能[J]. 无机材料学报, 2013, 28(9): 967-970.

ZHANG Dong-Sheng, TIAN Ai-Fen. Electrical Properties of K_0.5Na_0.5NbO₃ Lead-free Piezoceramics by Pressureless Sintering[J]. Journal of Inorganic Materials, 2013, 28(9): 967-970.

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无铅压电陶瓷KNN常压烧结及其电学性能

Electrical Properties of K_0.5Na_0.5NbO₃ Lead-free Piezoceramics by Pressureless Sintering

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无铅压电陶瓷KNN常压烧结及其电学性能

Electrical Properties of K0.5Na0.5NbO3 Lead-free Piezoceramics by Pressureless Sintering

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Electrical Properties of K_0.5Na_0.5NbO₃ Lead-free Piezoceramics by Pressureless Sintering