Ferroelectric and piezoelectric properties of bismuth layered-structure ferroelectric (Sr,Na,Bi)Bi₂Ta₂O₉ ceramics

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• 作者：Aoyagi ; Rintaro ; Takeda ; Hiroaki ; Okamura ; Soichiro ; Shiosaki ; Tadashi
• 关键词：Electrical measurements ; Bismuth layered-structure ferroelectrics ; Ceramics ; Solid solution ; Ferroelectricity ; Piezoelectricity
• 刊名：Materials Science & Engineering B
• 出版年：2005
• 期刊代码：76_09215107
• 类别：ch
• 出版时间：January 25, 2005
• 卷：116
• 期：2
• 页码：156-160
• 文件大小：137 K

摘要

Sodium strontium bismuth tantalate (1 − x)[Na_0.5Bi_2.5Ta₂O₉]–x[Sr_0.8Bi_2.15Ta₂O₉] (NSBT-x) solid solution ceramics were synthesized by an ordinary firing method. The ferroelectric and piezoelectric properties of the NSBT-x ceramics were characterized. A single phase with the ABi₂Ta₂O₉-type structure was obtained over the entire composition range. The Curie temperature, T_c, linearly decreased with an increase in x from 780 °C (x = 0) to 410 °C (x = 1.0). Well-developed P(polarization)–E(electric field) hysteresis loops were observed for all samples. The observed P_r-values were independent of the composition x. The coercive field, E_c, changed with the composition x and the maximum value of 72 kV/cm was obtained in the NSBT-0.25 ceramics. Superior piezoelectric properties were observed for the NSBT-0.75 ceramics sintered at 1200 °C. The maximum electromechanical coupling factors and mechanical quality factor were k_p = 9.0%, k₃₃ = 15.4%and Q_m(k_p) = 7000, respectively.