| 摘要 |
The present invention relates to a piezoelectric ceramic composition for actuator which is a composition comprising a basic composition containing lead, lanthanum, alkali earth metals, zirconium, titanium and oxygen in the formulation represented by the following general formula (I): <IMAGE> (I) where A represents one or more element(s) selected from the group consisting of Ba, Ca and Sr; 0<x</=0.07; 0.40</=y</=0.65; and 0<m</=0.15, wherein the ceramic composition containing, relative to the basic composition, one or more element(s) selected from the group consisting of iron, aluminum, manganese, indium and tellurium in an amount of 0.02 to 0.3% by weight in terms of Fe2O3 or Al2O3, 0.02 to 0.2% by weight in terms of MnO2 and 0.02 to 0.5% by weight in terms of In2O3 or TeO2. The composition according to the present invention is higher in piezoelectric strain constant and in Curie point, so that the element can be used over a wide range of temperature. This makes the composition useful as the material for piezoelectric actuators, contributing to various industrial application fields.
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