PBLZT弛豫铁电陶瓷的动态及偏压介电和压电特性

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．

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

Transverse field-induced strain (x_2-E), hysteresis loop (P-E), dielectric constant andpiezoelectric coefficient under DC bias were measured for 3mol% barium-doped PLZT 10/65/35relaxor ferroelectric ceramic. Dynamic dielectric constant and piezoelectric coefficient were calcu-lated according to the slope of x_2 - E and P - E curves respectively. Dynamic dielectric constantis much larger than DC biased dielectric constant as the electric field is less than 8 kV/cm, thedifference between them is getting smaller as the electric field increases. Dynamic piezoelectriccoefficient is much larger than the value under DC bias as the electric field is in the range of 3~15kV/cm, the difference between them is small as the electric field is less than 3 kV/cm or higherthan 15 kV/cm.