| 摘要 |
The present invention provides a piezoelectric ceramic composition that can be manufactured easily by an ordinary sintering method, is free from lead, and has a large frequency constant, a small grain size, and a high mechanical Q. This composition is expressed by a formula of (1-v-w)[(Li1-x-yNaxKy)zRO3].vLMnO3.wBi½Na½TiO3. The present invention also provides a piezoelectric ceramic composition, including at least one selected from Mn, Cr, and Co that is added to a composition expressed by a formula of (Li1-x-yNaxKy)zRO3 so as to have a ratio thereof to the whole of 0.01 to 1 wt % in terms of MnO2, Cr2O3, and CoO, respectively. In the above-mentioned formulae, 0<=v<=0.05, 0<=w<=0.2, v+w>0, 0.2<=x<=0.97, 0<=y<=0.8, x+y>=0.8, 0.98<=z<=1, L indicates at least one element selected from the rare earth elements, and R denotes at least one element selected from Nb, Ta, and Sb.
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