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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.117  No.1365 (May) (2009)  >  pp.680-684

Journal of the Ceramic Society of Japan
<<Previous article Vol.117  No.1365 (May) (2009)   pp.680 - 684 Next article>>

Physical and electric properties of lead-free (Na0.5K0.5)NbO3-Ba(Zr0.04Ti0.96)O3 ceramics

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

  Extending the investigations on (Na0.5K0.5)NbO3-based solid solution for lead-free piezoelectric ceramics, this paper consider the complex solid-solution system (Na0.5K0.5)NbO3-Ba(Zr0.04Ti0.96)O3 [NKN-BZT]. (Na0.5K0.5)NbO3 with 0-10 mol% Ba(Zr0.04Ti0.96)O3 has been prepared following the conventional mixed oxide process. X-ray diffraction analysis revealed that, during sintering, all of the Ba(Zr0.04Ti0.96)O3 diffuses into the lattice of (Na0.5K0.5)NbO3 to form a solid solution. Only a orthorhombic phase with a perovskite structure was found in this system. It was found that the samples with a low content of Ba(Zr0.04Ti0.96)O3 exhibit relatively good physical and electric properties. For 0.98 (Na0.5K0.5)NbO3-0.02Ba(Zr0.04Ti0.96)O3 ceramics, the electromechanical coupling coefficients of the planar mode kp and the thickness mode kt reach 0.26 and 0.52, respectively, at the sintering of 1100°C for 2 h. The ratio of thickness coupling coefficient to planar coupling coefficient is 2. For 0.98(Na0.5K0.5)NbO3-0.02Ba(Ti0.96Zr0.04)O3 ceramics, the electromechanical coupling coefficients of the planar mode kp and the thickness mode kt reach 0.3 and 0.55, respectively, at the sintering of 1100°C for 5 h. With suitable Ba(Zr0.04Ti0.96)O3 concentration and sintering condition, good physical and electric properties were obtained. Our results show that 0.98(Na0.5K0.5)NbO3-0.02Ba(Zr0.04Ti0.96)O3 solid solution ceramics are one of the promising lead-free ceramics for high frequency electromechanical transducer applications.


Keyword:
Lead-free ceramics, Piezoelectric, Dielectric, Sintering

Received: October 14, 2008
Accepted: February 19, 2009 , Published online: May 01, 2009
Copyright (c) 2009 The Ceramic Society of Japan

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