Piezoelectric ceramic composition and piezoelectric ceramic...

Details Piezoelectric ceramic composition and piezoelectric ceramic... Piezoelectric ceramic composition and piezoelectric ceramic...

2011-04-21

2011-12-13

Budd, Mark (Department: 2837)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C252S06290R

Reexamination Certificate

active

08076828

ABSTRACT:
A piezoelectric ceramic includes a main constituent represented by the general formula {(1−x) (K1-a-bNaaLib)(Nb1-cTac)O3}−xM2M4O3}, and as accessory constituents, 2α mol of Na, (α+β) mole of an M4′ element, and γ mol of Mn with respect to 100 mol of the main constituent, where 0.1≦α≦β, 1≦α+β≦10, and 0≦γ≦10, M2 is Ca, Ba, and/or Sr, the M4 element and the M4′ element are Zr, Sn, and/or Hf, 0≦x≦0.06, 0≦a≦0.9, 0≦b≦0.1, and 0≦c≦0.3. Even in the case of using Ni as the main constituent in an internal electrode material of a piezoelectric element and carrying out co-firing, favorable piezoelectric properties can be obtained without defective polarization.

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patent: 2008/0061263 (2008-03-01), Kawada et al.
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Written Opinion of the International Searching Authority, mailed Aug. 25, 2009.

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