Effect of Bi₂O₃ Addition on the Physical and Electrical Properties of Lead-Free (Na_0.5K_0.5)NbO₃ -( Na_0.5Bi_0.5)TiO₃ Ceramics

Abstract:

In this paper, the effects of Bi₂O₃ addition on the electrical and physical properties of 0.98(Na0.5K0.5)NbO3-0.02(Na0.5Bi0.5)TiO3 were investigated. The 0.98(Na_0.5K_0.5)NbO₃ -0.02(Na_0.5Bi_0.5)TiO₃ [0.98NKN-0.02NBT] ceramics with the addition of 0~0.5 wt% Bi₂O₃ 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_0.5Bi_0.5))NbO₃ to form a solid solution, in which a orthorhombic phase with a perovskite structure was found. For 0.98NKN-0.02NBT ceramics by doping 0.1 wt% Bi₂O₃, the poled dielectric constant (K33^T) and the electromechanical coupling coefficients of the planar mode k_p reach 684 and 0.38, respectively, after sintering at 1100 °C for 3 h. Our results show that 0.98NKN-0.02NBT with the addition of 0.1 wt% Bi₂O₃ is a good lead-free piezoelectric ceramic.

• Periodical: Advanced Materials Research (Volumes 311-313)
• Pages: 1250-1253
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.311-313.1250
• Online since: August 2011
• Authors: Chun Huy Wang
• Keywords: Dielectric Property, Electromechanical Transducer, Lead-Free Piezoelectric, Piezoelectric Properties, Poling, Sintering

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