无机材料学报

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(Na0.8K0.2)0.5Bi0.5TiO3陶瓷的介电压电性能

李月明1,2; 陈文1; 徐庆1; 周静1; 廖梅松1   

  1. 1.武汉理工大学材料科学与工程学院 武汉 430070; 2. 景德镇陶瓷学院; 景德镇 333001
  • 收稿日期:2003-07-03 修回日期:2003-09-12 出版日期:2004-07-20 网络出版日期:2004-07-20

Dielectric and Piezoelectric Properties of (Na0.8K0.2)0.5Bi0.5TiO3 Ceramics

LI Yue-Ming1,2; CHEN Wen1; XU Qing1; ZHOU Jing1; LIAO Mei-Song1   

  1. 1.Institute of Materials Science and Engineering; Wuhan University of Technology; Wuhan 430070; China; 2.Jingdezhen Ceramics Institute; Jingdezhen 333001; China
  • Received:2003-07-03 Revised:2003-09-12 Published:2004-07-20 Online:2004-07-20

摘要: 研究了(Na0.8K0.2)0.5Bi0.5TiO3陶瓷的介电和压电性能,发现陶瓷从室温到500℃温度范围的介电谱中存在两个介电峰,电滞回线显示第一个介电峰由铁电-反铁电相变引起的,温度继续升高,反铁电相由宏畴变为微畴,微畴向顺电相转变导致了第二个介电峰,该峰对应的相变为弥散型相变。室温下陶瓷具有较高的剩余极化强度Pr=29.4μC/cm2和相对低的矫顽电场Ec=2.8kV/mm,极化后的陶瓷显示出较高的压电常数d33=120pC/N和机电耦合系数Kp28.5%,以及高的频率常数Nφ=2916Hz·m,120℃具有最小的谐振频率温度系数。

关键词: 钛酸铋钠, 介电性, 压电性, 弛豫相变, 反铁电

Abstract: Dielectric and piezoelectric properties of (Na0.8K0.2)0.5Bi0.5TiO3 ceramics were
investigated. The results show that ferroelectric-antiferroelectric and antiferroelectric-paraelectric phase transition with relaxor characteristic
occur from room temperature to 500℃, leading to the two peaks of electric permittivity to temperature. At room temperature, it has relative
high remanent polarization Pr=29.4μC/cm2 and low conceive field Ec=2.8kV/mm. The polarized ceramics have good piezoelectric
properties such as piezoelectric constant d33=120pC/N, electromechanical coupling factor Kp=28.5%, frequency constant Nφ=2916Hz·m,
as well as minimum resonance frequency temperature coefficient at 120℃.

Key words: sodium-bismuth titanate, dielectric properties, piezoelectric properties, relaxor phase transition, antiferroelectric

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