Ferroelectric ceramics

Details Ferroelectric ceramics Ferroelectric ceramics

H - Electricity

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L

31/138

H01L 41/187 (2006.01) C04B 35/49 (2006.01)

Patent

CA 2027922

ABSTRACT The present invention relates to Perovskite ferroelectric ceramics comprising a Perovskite solid solution represented by the formula Pb1-(3/2)aMa{Ni1/3Nb2/3)1-b(Zn1/3Nb2/3)b}xTiyZrzO3 wherein M is at least one element selected from the group consisting of La and Nd, x + y + z is 1, said Perovskite solution containing MnO2. When compared with known ferroelectric ceramics, the ferroelectric ceramics according to the invention has a larger piezoelectric constant d and also a sufficiently high Curie temperature Tc, while having a mechanical quality factor Qm practically equal to that of the known ferroelectric ceramics. Accordingly, the ferroelectric ceramics according to the invention exhibit excellent characteristics when used in application such as a driving part of an actuator, for example, of an ultrasonic motor where mechanical resonance of the material used is utilized.

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