Effect of Bi2O3 Addition on the Physical and Electrical Properties of Lead-Free (Na0.5Bi0.5)TiO3-Ba(Sn0.08Ti0.92)O3 Ceramics

Chun Huy Wang

doi:10.4028/www.scientific.net/AMR.415-417.1051

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Effect of Bi₂O₃ Addition on the Physical and Electrical Properties of Lead-Free (Na_0.5Bi_0.5)TiO₃-Ba(Sn_0.08Ti_0.92)O₃ Ceramics

Abstract:

In the present study, various quantities of Bi₂O₃ were added into 0.98(Na_0.5Bi_0.5)TiO₃ -0.02Ba(Sn_0.08Ti_0.92)O₃ (0.98NBT-0.02BST) ceramics. High-density samples were obtained through the addition of Bi₂O₃ into 0.98NBT-0.02BST ceramic. It was found that 0.98NBT-0.02BST with the addition of 0~3.0 wt.% Bi₂O₃ exhibit relatively good piezoelectric properties. For 0.98NBT-0.02BST ceramic with the addition of 2 wt.% Bi₂O₃, the electromechanical coupling coefficients of the planar mode kp and the thickness mode kt reach 0.12 and 0.61, respectively, at the sintering of 1100oC for 3 h. The ratio of thickness coupling coefficient to planar coupling coefficient is 5.1. It is obvious that 0.98NBT-0.02BST solid solution ceramic by adding low quantities of Bi₂O₃ is one of the promising lead-free ceramics for high frequency electromechanical transducer applications.