Abstract
(Bi 0.5 Na 0.5 ) 0.94 Ba 0.06 TiO 3 (abbreviated to BNBT6) ceramics doped with 0–0.6 mol.% SmCoO 3 were synthesized by the conventional solid-state reaction method, and the effect of SmCoO 3 addition on the dielectric and piezoelectric properties was investigated. X-ray diffraction (XRD) patterns show that SmCoO 3 diffuses into the lattice of the BNBT6 ceramics to form a solid solution with a pure perovskite structure. SEM images indicate that the addition of SmCoO 3 caused a remarkably promoted grain growth. Our results reveal that both the piezoelectric and electromechanical properties of BNBT6 ceramics could be greatly improved by certain amount of SmCoO 3 substitutions. At room temperature, the BNBT6 ceramics doped with 0.4 mol.% SmCoO 3 exhibit the optimum properties with high piezoelectric constant ( d 33 =144 pC/N), high planar coupling factor ( k p =29.1%), and high mechanical quality factor ( Q m =219).
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