Piezoelectric Bi0.5(Na0.82K0.18)0.5TiO3 thick films were screen printed on Pt electroded alumina substrates. The resulting 38μm thick films sintered at 1100°C for 0.5h have maximum relative permittivity of 810, dielectric loss of 2.0% (at 10kHz), remanent polarization of 28.3μC∕cm2, coercive field of 62kV∕cm, and longitudinal effective piezoelectric coefficient d33eff of 109pm∕V. The temperature dependence of the dielectric constant shows two clear peaks that were associated with phase transitions. The performance of this lead free piezoelectric thick film could be comparable to the corresponding bulk ceramics.
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Zhang et al. (2008) studied this question.
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