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无机材料学报

无机材料学报

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PBLZT弛豫铁电陶瓷的动态及偏压介电和压电特性

伍建新; 庄志强   

  1. 华南理工大学材料科学与工程学院, 广州 510640
  • 收稿日期:1999-01-18 修回日期:1900-01-01 出版日期:2000-02-20 网络出版日期:2000-02-20

Dielectric and Piezoelectric Characteristics at Dynamic and DC Bias State for PBLZT Relaxor Ferroelectric Ceramic

WU Jian-Xin; ZHUANG Zhi-Qiang   

  1. College of Materials Science and Engineering; South China University of Technology; Guangzhou510640; China
  • Received:1999-01-18 Revised:1900-01-01 Published:2000-02-20 Online:2000-02-20

PDF (PC)

1028

被引次数

5

摘要： 测量了３ｍｏｌ％Ｂａ掺杂的ＰＬＺＴ１０／６５／３５弛豫铁电陶瓷的电滞回线、横向场诱应变、偏压下的介电常数和压电常数，并根据电滞回线和场诱应变曲线的斜率计算了动态介电常数和压电常数．实验表明，电场＜８ｋＶ／ｃｍ时，动态介电常数比偏压介电常数大很多，电场＞８ｋＶ／ｃｍ时，差值随电场增大而减小;电场在３～１５ｋＶ／ｃｍ之间时，动态压电常数比偏压压电常数大很多，电场＜３ｋＶ／ｃｍ及＞１５ｋＶ／ｃｍ时,动态压电常数和偏压压电常数相差不大．

关键词: 介电, 压电, 动态, 偏压, 弛豫铁电陶瓷

Abstract: Transverse field-induced strain (x2-E), hysteresis loop (P-E), dielectric constant and piezoelectric
coefficient under DC bias were measured for 3mol% barium-doped PLZT 10/65/35 relaxor ferroelectric ceramic. Dynamic dielectric constant and piezoelectric
coefficient were calculated according to the slope of x2-E and P-E curves respectively. Dynamic dielectric constant is much larger than DC biased dielectric
constant as the electric field is less than 8 kV/cm, the difference between them is getting smaller as the electric field increases. Dynamic piezoelectric
coefficient is much larger than the value under DC bias as the electric field is in the range of 3--15 kV/cm, the difference between them is small as
the electric field is less than 3 kV/cm or higher than 15 kV/cm.

Key words: dielectric, piezoelectric, dynamic, DC bias, relaxor ferroelectric ceramic

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