Piezoelectric ceramic and piezoelectric device

Details Piezoelectric ceramic and piezoelectric device Piezoelectric ceramic and piezoelectric device

2007-09-04

2007-09-04

Koslow, C. Melissa (Department: 1755)

Compositions

Piezoelectric

Lead, zirconium, titanium or compound thereof containing

C501S134000, C310S358000

Reexamination Certificate

active

11082025

ABSTRACT:
A piezoelectric ceramic and a piezoelectric device capable of being fired at a low temperature and improving piezoelectric properties are provided. The piezoelectric ceramic and the piezoelectric device includes Pba[(Znb/3Nb2/3)xTiyZrz]O3(where 0.94≦a≦1.02, 1<b≦3, x+y+z=1, 0.05≦x<0.125, 0.275<y≦0.5, 0.375<z≦0.6) or (Pbe·fMef)[(Zng/3Nb2/3)uTivZrw]O3(where 0.96≦e≦1.03, 0.01≦f≦0.1, 1<g≦3, u+v+w=1, 0.05≦u<0.125, 0.275<v≦0.5, 0.375<w≦0.6, and Me indicates Sr, Ba or Ca). When an excessive amount of Zn is included, the firing temperature can be lower, and the piezoelectric properties can be improved.

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Hou et al., “Piezoelectric Properties of New MnO2-added 0.2 PZN-0.8 PZT Ceramic,” Materials Letters, vol. 58, pp. 1508-1512, 2004.

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