| 摘要 |
A piezoelectric ceramic composition consists essentially of a composite oxide with perovskite structure comprising Pb, Zr and Ti, and contains, as the side component, at least one of Mn and Cr, and further contains Cu. Preferably, the composition still further contains W, more preferably at W/Cu>/=1.1. Even more preferably, the composition has an excess Pb content larger than the stoichiometric amount of Pb in site A of the composite oxide when represented by the general formula, ABO3. The composition can be sintered at low temperatures and has good piezoelectric characteristics, for example, a high electromechanical coupling factor.
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