| 摘要 |
A piezoelectric ceramic composition includes: a composite oxide, as a main component thereof, represented by the composition formula, <?in-line-formulae description="In-line Formulae" end="lead"?>Pba[(Zn1/3Nb2/3)xTiyZrz]O3,<?in-line-formulae description="In-line Formulae" end="tail"?> wherein a, x, y and z satisfy the following relations, <?in-line-formulae description="In-line Formulae" end="lead"?>0.96<=a<=1.03, 0.005<=x<=0.047, 0.42<=y<=0.53, 0.45<=z<=0.56, and x+y+z=1;<?in-line-formulae description="In-line Formulae" end="tail"?> and the following additives in the indicated percentages by mass in relation to the main component, Cu as a first additive, in a content alpha, in terms of Cu2O, falling within a range 0<alpha<=0.5%; at least one of Dy, Nd, Eu, Gd, Tb, Ho and Er, as a second additive, in a content beta, in terms of oxide, falling within a range 0<beta<=0.3%; and at least one of Ta, Nb, W and Sb, as a third additive, in a content gamma, in terms of oxide, falling within a range 0<gamma<=0.6%.
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