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

WU Jian-Xin; ZHUANG Zhi-Qiang(College of Materials Science and Engineering, South China University of Technology, Guangzhou510640, China)  
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.
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