The piezoelectric properties in some bismuth layer-structured ferroelectric (BLSF) ceramics were investigated focusing on a mechanical quality factor,
Qm. Many BLSF compositions with various Curie temperature,
Tc, were selected in this study, and the
Qm values of (33) mode were plotted as a function of their Curie temperature,
Tc. The
Qm increased with increasing the
Tc in the low
Tc compositions below 500°C. It is considered to relate with the domain wall pinning because the coercive field,
Ec also increased with increasing the
Tc. However, in the high
Tc compositions above 750°C, the
Qm decreased with increasing the
Tc contrary, because of the difficulties in poling treatment due to the
Ec. On the other hand, high
Qm values more than 10,000 were obtained in the intermediate
Tc compositions between at 500 to 750°C. These values are quite high as the piezoelectric ceramics. The key point of the high
Qm in these compositions is the poling process at high temperature of 300°C.
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