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Abstract
Abstract Lead-free Na 1/2 Bi 1/2 TiO 3 –BaTiO 3 piezoelectric ceramics with perovskite structure were studied. The piezoelectric properties of (1− x )Na 1/2 Bi 1/2 TiO 3 – x BaTiO 3 ( x =0.02, 0.04, 0.06, 0.08, 0.10) ceramics were reported and their piezoelectric properties reach extreme values near the MPB (about x =0.06). Influences of nonstoichiometry and doping on the structures and piezoelectric properties of (Na 1/2 Bi 1/2 ) 0.92 Ba 0.08 TiO 3 ceramics were further studied. The relationship between piezoelectric constant and depolarization temperature of nonstoichiometric and doped ceramics was also investigated. It was found that in most of Na 1/2 Bi 1/2 TiO 3 –BaTiO 3 ceramics studied, their depolarization temperatures were much lower than maximum temperatures of dielectric constant–temperature curves; the origin of this phenomenon was discussed.
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