| 摘要 |
The present invention provides a piezoelectric ceramic composition, especially a lead-free piezoelectric ceramic composition, with a suitable amount of CeO2 or CeO2-containing complex additives, which is represented by the following formula: (Na0.475K0.475Li0.05)(Nb1-xAx)O3+yCeO2+zBO2 wherein "A" represents Sb or Sb+Ta, "B" represents a tetravalent transition metal, 0<=x<=0.2, 0.2 wt %<y<1.2 wt % and 0<=z 1 wt %. Addition of CeO2 or CeO2-containing complex additives suppresses melting and abnormal grain growth of (Na0.475K0.475Li0.05)(Nb1-xAx)O3 during sintering, thereby improving sinterability and increasing the density of the composition. As a result, the dielectric and piezoelectric properties of the ceramics are enhanced. Furthermore, the represented compositions have a wide sintering temperature range so that the process for preparing such a lead-free piezoelectric ceramic composition has high degree efficiency.
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