首页|Effect of Mn_2O_3 Addition on the Electric and Physical Properties of Lead-Free 0.98(Na_(0.5)Bi_(0.5))TiO_3-0.02 Ba(Sn_(0.08)Ti_(0.92))O_3 Piezoelectric Ceramics
Effect of Mn_2O_3 Addition on the Electric and Physical Properties of Lead-Free 0.98(Na_(0.5)Bi_(0.5))TiO_3-0.02 Ba(Sn_(0.08)Ti_(0.92))O_3 Piezoelectric Ceramics
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In this paper, the effect of Mn_2O_3 additions on the electrical and physical properties of 0.98(Na_(0.5)Bi_(0.5))TiO_3 -0.02Ba(Sn_(0.08)Ti_(0.92))O_3 was investigated. X-ray diffraction analysis revealed that, during sintering, all of the Ba(Sn,Ti)O_3 diffuse into the lattice of (Na_(0.5)Bi_(0.5))TiO_3 to form a solid solution, in which a hexagonal phase with a perovskite structure was found. The 0.98(Na_(0.5)Bi_(0.5))TiO_3 -0.02Ba(Sn_(0.08)Ti_(0.92))O_3 [0.98NBT-0.02BST] ceramics with the addition of 0～4.0 wt% Mn_2O_3 have been prepared following the conventional mixed oxide process. For 0.98NBT-0.02BST ceramics by doping 1.0 wt% Mn_2O_3, the electromechanical coupling coefficients of the planar mode k_p and the thickness mode k_t reach 0.12 and 0.52, respectively, at the sintering of 1100℃ for 3 h. The 0.98NBT-0.02BST ceramic with 1 wt% Mn_2O_3 addition exhibit a more homogeneous and grain size of～3.5 urn. With suitable Mn_2O_3 doping, a dense microstructure and good piezoelectric properties were obtained.
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