Effect of Mn₂O₃ Addition on the Electric and Physical Properties of Lead-Free 0.98(Na_0.5Bi_0.5)TiO₃-0.02 Ba(Sn_0.08Ti_0.92)O₃ Piezoelectric Ceramics

Abstract:

In this paper, the effect of Mn2O3 additions on the electrical and physical properties of 0.98(Na0.5Bi0.5)TiO3 -0.02Ba(Sn0.08Ti0.92)O3 was investigated. X-ray diffraction analysis revealed that, during sintering, all of the Ba(Sn,Ti)O3 diffuse into the lattice of (Na0.5Bi0.5)TiO3 to form a solid solution, in which a hexagonal phase with a perovskite structure was found. The 0.98(Na0.5Bi0.5)TiO3 -0.02Ba(Sn0.08Ti0.92)O3 [0.98NBT-0.02BST] ceramics with the addition of 0~4.0 wt% Mn2O3 have been prepared following the conventional mixed oxide process. For 0.98NBT-0.02BST ceramics by doping 1.0 wt% Mn2O3, the electromechanical coupling coefficients of the planar mode kp and the thickness mode kt reach 0.12 and 0.52, respectively, at the sintering of 1100 oC for 3 h. The 0.98NBT-0.02BST ceramic with 1 wt% Mn2O3 addition exhibit a more homogeneous and grain size of ~3.5 μm. With suitable Mn2O3 doping, a dense microstructure and good piezoelectric properties were obtained.

• Periodical: Key Engineering Materials (Volumes 434-435)
• Pages: 409-412
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.434-435.409
• Online since: March 2010
• Authors: Chun Huy Wang
• Keywords: Ceramic, Dielectric Property, Electrical Properties, Piezoelectricity, X-Ray Diffraction (XRD)

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