Abstract
Bi0.5(Na0.82K0.18)0.5TiO3 (NKBT) lead-free thick films with a thickness of 10–100 μm have been deposited on a Pt-electroded alumina substrate using screen printing. The influences of the NKBT particle size, NKBT powder content, binder concentration, and dispersant on the rheological characteristics were systematically investigated. The resulting 60 μm thick films exhibit a dielectric constant of 582 (10 kHz), a dielectric loss of 2.8%, remanent polarization of 22.5 μC/cm2, a coercive field of 62 kV/cm, and a longitudinal effective piezoelectric coefficient, d33eff of 91 pm/V. The thick films are expected to be a new and promising candidate for lead-free piezoelectric microdevices especially the microactuator applications.
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