| 摘要 |
A piezoelectric ceramic composition is provided, which includes a ceramic composition expressed by a general formula: Sr1-x-yM1xM2yBi2(Nb1-aTaa)2-zTizO9, wherein M1 is at least one element selected from the group consisting of Ca and Ba, M2 is at least one element selected from the group consisting of La, Y, Dy, Er, Yb, Pr, Nd, Sm, Eu and Gd, and x, y, z and a in the general formula respectively are in the range of 0.0 ≤ x < 0.9, 0.0 < y < 0.3, 0.0 ≤ z < 0.3, and 0.0 ≤ a ≤ 1.0. This makes it possible to provide a piezoelectric ceramic composition that is free of lead and has a larger electromechanical coupling factor than a conventional bismuth layered compound, and a piezoelectric element using the same. This piezoelectric element 10 includes a piezoelectric body 11, and electrodes 12a and 12b that are formed on two principal planes of the piezoelectric body 11. <IMAGE>
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