High-Power Piezoelectric Characteristics of Nontextured Bismuth Layer-Structured Ferroelectric Ceramics

概要

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High-power piezoelectric characteristics under continuous driving were studied on some bismuth layer-structured ferroelectric ceramics, i.e., Sr0.25Bi2.75Ti0.75Ta1.25O9 (SBTT, $m = 2$), Bi4Ti2.98V0.02O12 (BITV, $m = 3$), Bi4Ti3O12--SrBi4Ti4O15 + MnCO3 0.2 wt % (BIT--SBTi, $m = 3$, 4), and (Sr0.7Ca0.3)2Bi4Ti5O18 + MnCO3 0.2 wt % (SCBT, $m = 5$). The vibration velocities, $v_{\text{0{\mbox{--}}p}}$, of SBTT, BIT--SBTi, and SCBT ceramics were above 2.0 m/s at 5 V/mm. Also, we observed that the resonance frequency changes and temperatures on the sample surfaces for SBTT, BIT--SBTi, and SCBT ceramics were less than 1.0% and 50 °C at a $v_{\text{0{\mbox{--}}p}}$ of 2.0 m/s, respectively. The high-power characteristics of the ceramics were superior to those of BITV and hard Pb(Zr,Ti)O3 (abbreviated as PZT) at a vibration velocity $v_{\text{0{\mbox{--}}p}} > 0.6$ m/s. Therefore, SBTT, BIT--SBTi and SCBT ceramics are promising candidates for lead-free high-power applications requiring high vibration velocity and frequency stability.
2011-09-25