Abstract
Ba(0.9−x)YxCa0.1Zr0.07Ti0.93O3 lead free piezoelectric ceramics were synthesized for x = 0–0.035 in the steps of 0.005. The lead free piezoceramics are gaining importance as there is an urgent demand for replacing the highly toxic PZT family piezoceramics. Ba0.9Ca0.1Zr0.07Ti0.93O3 (BCZT) is one such system. It shows some high electrical properties but suffers with a low Curie temperature, which restricts its usage in low temperature range only. In the present study, the Curie temperature has been improved by 9 °C. A polymorphic phase transition (PPT) has also been observed around x = 0.015, consisting of orthorhombic and tetragonal phases, which provides the polarization vector more number of favorable directions. As a result the remnant polarization (Pr), piezoelectric charge coefficient (d33) and electromechanical coupling coefficient (kp) attain their maximum values of 5.21 μC/cm2, 200 pC/N and 24.78% respectively for x = 0.015. This increase in transition temperature and other electrical properties makes BCZT a potential candidate for a lead free piezoelectric system.
Published Version
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