Compositions – Piezoelectric
Reexamination Certificate
2006-02-28
2009-02-24
Koslow, C. Melissa (Department: 1793)
Compositions
Piezoelectric
C501S134000
Reexamination Certificate
active
07494601
ABSTRACT:
The present invention provides a piezoelectric ceramic composition, especially a lead-free piezoelectric ceramic composition, with a suitable amount of CeO2or CeO2-containing complex additives, which is represented by the following formula:(Na0.475K0.475Li0.05)(Nb1-xAx)O3+yCeO2+zBO2wherein “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 CeO2or CeO2-containing complex additives suppresses melting and abnormal grain growth of (Na0.475K0.475Li0.05)(Nb1-xAx)O3during 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.
REFERENCES:
patent: 6093339 (2000-07-01), Kimura et al.
patent: 2004/0058797 (2004-03-01), Nonoyama et al.
patent: 2004244301 (2004-09-01), None
patent: 2004244302 (2004-09-01), None
Chan Helen Lai Wah
Choy Siu Hong
Kwok Kin Wing
Wang Xiaoxing
Dickinson Wright PLLC
Koslow C. Melissa
Naber John M.
The Hong Kong Polytechnic University
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