| 摘要 |
A piezoelectric ceramic composition comprising a perovskite compound which contains, as metal components, Pb, Sr, Zr, Ti, Nb, Cr, Y, Co and at least one element selected from La, Gd, Nd, Sm and Pr, and may further contain Sb or Na, wherein when the composition formula is expressed as, (Pb1-x- alpha -ySrxNa alpha My)a[(NbbYcCrdCoeSb beta )fTigZr1-f-g]O3, wherein M is at least one element selected from La, Gd, Nd, Sm and Pr, then, x, y, a, b, c, d, e, f, g, alpha and beta satisfy the following relationships, 0.005</=x</=0.08, 0.002</=y</=0.05, 0.95</=a</=1.05, 0.47</=b</=0.70, 0.02</=c</=0.31, 0.11</=d</=0.42, 0.01</=e</=0.12, 0.02</=f</=0.15, 0.46</=g</=0.52, 0</= alpha </=0.005, 0</= beta </=0.13, and b+c+d+e+ beta =1.00. The piezoelectric ceramic composition of the present invention exhibits a high electromechanical coupling coefficient Kp, a low mechanical quality factor Qm, a low dielectric constant epsilon r, excellent heat resistance, and can be preferably used as a piezoelectric part for being mounted on the surface and, particularly, as a digital piezoelectric.
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