Piezoelectric ceramic composition and piezoelectric element

Details Piezoelectric ceramic composition and piezoelectric element Piezoelectric ceramic composition and piezoelectric element

2007-01-22

2008-12-23

Koslow, C. Melissa (Department: 1793)

Compositions

Piezoelectric

C501S134000, C310S311000, C310S366000, C310S365000

Reexamination Certificate

active

07468143

ABSTRACT:
The piezoelectric ceramic composition of the present invention contains a main component represented by general formula {(1-n)(Ag1-xLix)m(Nb1-yTay)O3-n(M1,M2)M3M3O3} or {(1-n)(Ag1-xLix)m(Nb1-yTay)O3-nM4M5O3} and x, y, m, and n are defined to be 0.075≦x<0.40, 0≦y<0.2, 0.98≦m≦1.0, and 0.01≦n≦0.1. M1 is a trivalent metal element such as Bi; M2 is a monovalent metal element such as K, Na, Li or Ag; M3 and M5 each are a tetravalent metal element such as Ti, Zr, Sn or Hf; and M4 is a divalent metal element such as Ba, Sr, Ca, or Mg. With this composition, an highly reliable lead-free piezoelectric ceramic composition having a high relative dielectric constant and good piezoelectric properties such as electromechanical coupling factor k33and piezoelectric constant d33can be provided, and a highly reliable lead-free piezoelectric element can be fabricated using the piezoelectric ceramic composition.

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Written Opinion of the International Searching Authority dated Sep. 20, 2005.

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