| 摘要 |
The present invention provides a piezoelectric ceramic composition, by which it is possible to obtain piezoelectric ceramic chip parts, having high electromechanical coupling factor and high heat-resistant property, and also good temperature coefficient of resonance frequency while maintaining high heat-resistant property, and low change over time. The piezoelectric ceramic compositions of the present invention include: a first piezoelectric ceramic composition, which is obtained by simultaneously solubilizing (Mg1/3Nb2/3)O3 and (Yb1/2Nb1/2)O3 as third and fourth components respectively to PbTiO3-PbZrO3 and is expressed by a general formula: Pby[(Mg1/3Nb2/3)a(Yb1/2Nb1/2) bTicZrd] O3 (where a + b + c + d = 1), and the following conditions are satisfied: 0.95 </= y </= 1.05, 0.01 </= a </= 0.15, 0.01 </= b </= 0.10, 0.30 </= c </= 0.60, 0.25 </= d </= 0.55, a second piezoelectric ceramic composition, which is obtained by substituting a part of Pb of the first piezoelectric ceramic composition with at least one element selected from Ba, Sr and Ca, a third piezoelectric ceramic composition, in which Yb treated as trivalent in the first piezoelectric ceramic composition is treated as bivalent, a fourth piezoelectric ceramic composition, which is obtained by adding at least one element selected from Cr and Mn as secondary component to the third piezoelectric ceramic composition and a fifth piezoelectric ceramic composition, which is obtained by substituting a part of Pb in the third piezoelectric ceramic composition with at least one element selected from Ba, Sr and Ca. <IMAGE> |
