High-Power Piezoelectric Characteristics of Bi4Ti3O12–SrBi4Ti4O15-Based Ferroelectric Ceramics

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The high-power piezoelectric characteristics of lead-free piezoelectric ceramics based on a mixed bismuth layer-structured ferroelectric, Bi4Ti3O12–SrBi4Ti4O15 (abbreviated as BIT–SBTi) were studied. In addition, MnCO3-doped BIT–SBTi (abbreviated as BIT–SBTi + Mn $x$ wt %) were prepared to improve their high-power piezoelectric properties such as the mechanical quality factor $Q_{\text{m}}$. In the case of pure BIT–SBTi, its vibration velocity $v_{\text{0--p}}$ at 5 V/mm field is 1.5 m/s. The $v_{\text{0--p}}$ values of the BIT–SBTi + Mn 0.2 and 0.4 wt % ceramics were above 2.0 m/s at 5 V/mm. Also, we observed that the mechanical quality factor $Q_{\text{m}}$ at a large amplitude of BIT–SBTi + Mn 0.4 wt % was maintained higher than 4000 at $v_{\text{0--p}}$ of 2.0 m/s. The high-power characteristics of BIT–SBTi + Mn $x$ wt % were superior to those of hard Pb(Zr,Ti)O3 (abbreviated as PZT) at a vibration velocity $v_{\text{0--p}}>1.0$ m/s. Therefore, Mn-doped BIT–SBTi-based ceramics are a promising candidate for lead-free high-power applications.
2010-09-25