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Abstract

Disclosed is a piezoelectric ceramic composition comprising a PZT piezoelectric composition, a B-site of which is substituted with a certain material, and chromium oxide, and a piezoelectric device using the piezoelectric ceramic composition. The piezoelectric ceramic composition has good heat resistance and frequency stability, and reduces a leakage current. There is provided the piezoelectric ceramic composition comprising a main component expressed by Pb[(Co.sub.1/2 W.sub.1/2).sub.x Ti.sub.1-x-y Zr.sub.y ]O.sub.3 (wherein, 0.001.ltoreq.x.ltoreq.0.04, and 0.35 .ltoreq.y.ltoreq.0.55), Cr.sub.2 O.sub.3 in an amount of 0.01 to 2 wt %, MnO.sub.2 in an amount of 0.1 to 0.5 wt %, and an additive in an amount of 0.01 to 2.0 wt %, based on the total weight of the piezoelectric ceramic composition, in which the additive is selected from the group consisting of CoO, MgO, ZnO, Al.sub.2 O.sub.3, Fe.sub.2 O.sub.3, Sb.sub.2 O.sub.3, SnO.sub.2, CeO.sub.2, Nb.sub.2 O.sub.5, V.sub.2 O.sub.5 and WO.sub.3, and mixtures thereof. The piezoelectric ceramic composition satisfies piezoelectric properties such as kp and Qm needed for a piezoelectric material, and is 320.degree. C. or higher in phase transition temperature, .+-.30 ppm/.degree. C. in TCF, and 0.1% or less in oscillation frequency change after reflow; and the piezoelectric ceramic composition also has good piezoelectric properties such that the leakage current is reduced.

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