Effect of Nb₂O₅ Addition on the Electrical and Physical Properties of Lead-Free 0.98(Na_0.5K_0.5)NbO₃-0.02(Na_0.5Bi_0.5)TiO₃ Piezoelectric Ceramics

Abstract:

In this paper, the effects of Nb₂O₅ addition on the electrical and physical properties of 0.98(Na_0.5K_0.5)NbO₃-0.02(Na_0.5Bi_0.5)TiO₃ were investigated. The 0.98(Na_0.5K_0.5)NbO₃-0.02(Na_0.5 Bi_0.5)TiO₃ [0.98NKN-0.02NBT] ceramics with the addition of 0~1.5 wt% Nb₂O₅ have been prepared following the conventional mixed oxide process. X-ray diffraction analysis revealed that, during sintering, all of the (Na_0.5Bi_0.5)TiO₃ diffuse into the lattice of (Na_0.5K_0.5)NbO₃ to form a solid solution, in which an orthorhombic phase with a perovskite structure was found. For 0.98NKN-0.02NBT ceramics by doping 0.3 wt% Nb₂O₅, the poled dielectric constant (K₃₃^T) is 1180. The electromechanical coupling coefficients of the planar mode k_p and the thickness mode k_t reach 0.43 and 0.52, respectively. Our results show that 0.98NKN-0.02NBT with the addition of 0.3 wt% Nb₂O₅ is a good lead-free piezoelectric ceramic.

• Periodical: Materials Science Forum (Volume 687)
• Pages: 269-274
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.687.269
• Online since: June 2011
• Authors: Chun Huy Wang
• Keywords: Dielectric Property, Piezoelectric Properties, Poling, Sintering

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