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A new group of lead-free piezoelectric ceramics, ( Bi0.5 Na0.5 ) 1 - x ( BaaSrb ) x TiO3 ( abbreviated as BNBST[ 100x - 100a/100b ] ,0 < x < 1, a + b = 1 ), was synthesized. The ceramics were prepared by conventional ceramic sintering technique, and the c