High Power Characteristics of (Ca,Ba)TiO3 Piezoelectric Ceramics with High Mechanical Quality Factor

概要

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(Ca0.1Ba0.9)TiO3 + $x$ wt % MnCO3 [$x=0, 0.2, 0.5, 1.0$] (CBT-M$x$) ceramics were prepared by conventional sintering, and their dielectric and piezoelectric properties were measured. The mechanical quality factor ($Q_{\text{m}}$) of CBT was markedly enhanced by Mn addition and reached 2400 when $x=0.5$. The dielectric loss tangent ($\tan\delta$) was 0.0023 at room temperature. The Curie temperature ($T_{\text{C}}$) was 133 °C. Then, the high power characteristics of CBT-M0.5 were investigated. The maximum vibration velocity ($v_{0}$) of CBT-M0.5 was 1.1 m/s and was higher than that of Pb(Zr,Ti)O3-based ceramics (Hard-PZT). The heat generation of CBT-M0.5 was smaller than that of Hard-PZT at the same $v_{0}$. The resonant frequency ($f_{\text{r}}$) of CBT-M0.5 was stable up to $v_{0}$ of 1.1 m/s. Additionally, the temperature stability of $f_{\text{r}}$ was investigated in the practical application temperature range (from $-20$ to 80 °C). The amount of change in $f_{\text{r}}$ for CBT-M0.5 was larger than that for Hard-PZT below 10 °C.
2010-09-25