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Preparation and Piezoelectric Characterization of (K_0.5Na_0.5)NbO₃ Ceramic

J. Venkatesh, M. Es-Souni

In this article the preparation, microstructure, dielectric and piezoelectric properties of lead free piezoelectric ceramic (K_0.5Na_0.5) Nbo₃ are reported. We have followed the conventional processing route to achieve 93%-94% density with average grain size distribution of about 10 microns. A longitudinal piezoelectric coefficient (d₃₃) of 94 pm/v ± 0.8 pm/v and radial coupling coefficient K_P of 33% have been obtained on this compound. The measured free permittivity and loss tangents at 1 kHz are found to be 436 and 9%, respectively.