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In order to develope piezoelectric transformer for the ballast of fluorescent lamp, the composition of piezoelectric ceramics was 0.95Pb(Zr x Ti 1-x )O3+yPb(Mn 1/3 Nb 2/3 )O 3 +(0.05-y)Pb(Sb 1/2 Nb 1/2 )O 3 . PMN compound was selected to improve mechanical quality factor and PSN to prevent the decrease of dielectric constant and electromechanical coupling coefficient. Dielectric and piezoelectric characteristics in the region of MPB of 0.95Pb(Zr x Ti 1-x )O 3 +yPb(Mn 1/3 Nb 2/3 )O 3 +(0.05-y)Pb(Sb 1/2 Nb 1/2 )O 3 ceramics was discussed both quantatively and qualitatively.Key Words : Piezoelectric Transformer, Piezoelectric Ceramic *  : (jp1212@paran.com) 10 11 04  10 12 21  11 01 13 1.             ,      kp   e T33   .            Q e    Q m       .           ,             .    MPB    ,            ,             [1-3].      ,        PZT 2    ,           3    PZT 3  ,  3       MPB  , ㆍ    ㆍ  .