| 摘要 |
The present invention provides a piezoelectric ceramic composition that is free from lead and has a small grain size, a high coupling coefficient, a high mechanical Q, and a large frequency constant. This composition is characterized by being expressed by a formula of (LixNa1-x-yKy)z-2wMa2wNb1-wMbwO3, wherein 0.03<=x<=0.2, 0<=y<=0.2, 0.98<=z<=1, 0<w<=0.05, Ma indicates at least one element selected from the alkaline-earth metals, and Mb denotes at least one element selected from Bi, Sb, and the rare earth elements.
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