PIEZOELECTRIC CERAMIC MATERIAL

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PROBLEM TO BE SOLVED : To provide a piezoelectric ceramic material having electromechanical coupling coefficient and mechanical quality factor satisfying a level not less than a specific value and having high stability of piezoelectric characteristics to the change of a temperature. SOLUTION : The piezoelectric ceramic material has a composition formula expressed by Pbx[(Co1/3Nb2/3-y)a(Sb1/2Nb1/2)bTicZrd]O3+(e) wt.% R2O3 (where, a+b+c+d=1 and R expresses a rare earth element) and the composition range is 0.92≤x≤1.00, 0

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