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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.117  No.1365 (May) (2009)  >  pp.693-697

Journal of the Ceramic Society of Japan
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Effect of Bi2O3 addition and sintering time on the physical and electrical properties of lead-free (Na0.5Bi0.5)TiO3-Ba(Zr0.04Ti0.96)O3 ceramics

Chun-Huy WANG1)
1) Department of Electronic Engineering, Nan-Jeon Institute of Technology

  Although PbZrO3-PbTiO3 (PZT)-based ceramics are playing a dominant role in piezoelectric materials, their evaporation of harmful lead oxide during the sintering process causes a crucial environment problem. It is necessary to search for lead-free piezoelectric materials that have such excellent properties as those found in the PZT-based ceramics. Therefore (Na0.5Bi0.5)TiO3-based solid solutions were studied to improve piezoelectric properties. In the present study, various quantities of Bi2O3 were added into 0.99(Na0.5Bi0.5)TiO3-0.01Ba(Zr0.04Ti0.96)O3 (0.99NBT-0.01BZT) ceramics. High-density samples were obtained through the addition of Bi2O3 into 0.99NBT-0.01BZT ceramic. It was found that 0.99NBT-0.01BZT with the addition of 0-4.0 wt% Bi2O3 exhibit relatively good piezoelectric properties. For 0.99NBT-0.01BZT ceramic with the addition of 0.5 wt% Bi2O3, the electromechanical coupling coefficients of the planar mode kp and the thickness mode kt reach 0.15 and 0.55, respectively, at the sintering of 1100°C for 2 h. The ratio of thickness coupling coefficient to planar coupling coefficient is 3.6. It is obvious that 0.99NBT-0.01BZT solid solution ceramic by adding low quantities of Bi2O3 is one of the promising lead-free ceramics for high frequency electromechanical transducer applications.

Lead-free piezoceramics, Piezoelectric property, Crystal structure, Dielectric property

Received: December 01, 2008
Accepted: February 19, 2009 , Published online: May 01, 2009
Copyright (c) 2009 The Ceramic Society of Japan



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