| 摘要 |
A multilayer piezoelectric device including a body having internal electrode layers and piezoelectric ceramic layers alternately stacked. The internal electrode layers contain Cu as a major component, the piezoelectric ceramic layers contain a compound oxide represented by Pb(Ti, Zr)O<SUB>3 </SUB>as a major component, and a metal oxide (Nb<SUB>2</SUB>O<SUB>5</SUB>, Sb<SUB>2</SUB>O<SUB>5</SUB>, Ta<SUB>2</SUB>O<SUB>5</SUB>, or WO<SUB>3</SUB>) containing Nb, Sb, Ta, or W, which is at least one of a pentavalent metal element and a hexavalent metal element, is incorporated in the piezoelectric ceramic layers such that the concentration of the metal oxide decreases with distance from the internal electrode layers. Thereby, even in a case where internal electrodes contain Cu as a major component, it is possible to provide a multilayer piezoelectric device which can be obtained by low-temperature firing while ensuring a sufficient piezoelectric constant.
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