Abstract
Piezoelectric ceramics (Na 0.5Bi 0.5) 0.92Ba 0.08TiO 3+ x mol.% Mn (BNBT-Mn) with x ranging from 0 to 2.97 are synthesized by conventional solid state reaction. The sintered BNBT-Mn exhibited a single phase perovskite structure without detectable secondary phase from x=0 to x=2.6. With increasing amount of doped Mn, the Curie temperature ( T c) of BNBT-Mn decreased rapidly, piezoelectric constants d 33 and k t increased promptly when x was lower than 0.56, taking the maximum value of 160×(10 −12 C/N) and 58.5%, respectively for x=0.56, then decreased slightly with x ranging from 0.56 to 2.6, and finally decreased rapidly for x>2.6, whereas Q m showed a different trend from d 33 and k t. Furthermore, k t had a relatively high value under the low poling field ( E p) for x=0.56 owing to the reduced coercive field ( E c). Possible mechanisms of the influence of Mn doping on the microstructure and piezoelectric properties are discussed.
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