PIEZOELECTRIC CERAMIC COMPOSITION

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PROBLEM TO BE SOLVED : To provide a piezoelectric ceramic composition having improved electromechanical coupling coefficient and smaller variation rate due to temperature change of mechanical quality factor and resonance frequency while high mechanical quality factor is maintained.SOLUTION : The piezoelectric ceramic composition in which a part of Pb site of a perovskite compound consisting essentially of Pb(Mn1/3Sb2/3)O3-PbZrO3-PbTiO3 is replaced by a rare earth element selected from La, Nd and Sm has a composition formula of Pb1-3x/2Mx[(Mn1/3Sb2/3)aZrbTic]O3 (where 0

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