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In order to obtain high Qm ceramics, different additives including MnO2 , Fe2 O3 and K2 CO3 were added into the base PZT composition of xPb ( Zn0.2 Sn0.3 Mn0.5 )1/3 Nb2/3 O3 - ( 1 - x ) Pb ( Zr0.5 Ti0.5 ) O3 .The mechanical quality factor Qm increased whi