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Piezoelectric ceramics (Na0.5Bi0.5)0.92Ba0.08 TiO3 +x% MnCO3 (BNBT-Mn, x= 0 - 1. 6, mass fraction)were synthesized by conventional solid state reaction. The results show that when the addition of MnCO3 is 0 -1.4%, BNBT-Mn ceramics exhibit a single-phase p