THE LOW TEMPERATURE SINTERING PROPERTIES OF MODIFIED PbTiO₃ CERAMICS

ABSTRACT

In the study, in order to develop low-temperature-sintering ceramics for multilayer piezoelectric transformer, (Pb_0.76Ca_{0.24 −x}Sr_x)Ti_0.96 (Mn_1/3Sb_2/3)_0.04O₃ ceramics were fabricated using Na₂CO₃ and Li₂CO₃ as sintering aids and their dielectric and piezoelectric properties were investigated with amount of Sr substitution. The modified PbTiO₃ ceramics with a composition of (Pb_0.76Ca_{0.24 − x}Sr_x)Ti_0.96 (Mn_1/3Sb_2/3)_0.04O₃; x = 0 − 0.05 were prepared by conventional mixed-oxide at sintering temperature of 880, 900 and 930°C. At the sintering temperature of 900°C, thickness vibration mode electromechanical coupling factor (K_t) and thickness vibration mode mechanical quality factor (Q_mt) of composition ceramics with 1.0mol% Sr substitution showed the optimal value of 0.50 and 1575 respectively, for multilayer piezoelectric transformer application.

Keywords:

• Low temperature sintering
• thickness electromechanical coupling factor
• thickness vibration mode mechanical quality factor
• sintering aids

ACKNOWLEDGMENTS

This work was supported by KEMCO (2005-03-0013-0-000), which is funded by MOCIE(Ministry of Commerce Industry and Energy).