Ceramic material and piezoelectric element using the same

Details Ceramic material and piezoelectric element using the same Ceramic material and piezoelectric element using the same

2006-05-16

2006-05-16

Koslow, C. Melissa (Department: 1755)

Compositions

Piezoelectric

Lead, zirconium, titanium or compound thereof containing

C501S134000, C501S135000, C501S136000, C310S311000, C310S364000, C310S100000

Reexamination Certificate

active

07045075

ABSTRACT:
A ceramic material has piezoelectric characteristics, can be sintered at low temperature, and is suited to various piezoelectric devices. The ceramic material primarily includes Pb, Zr, and Ti and has the general formula ABOd, in which A is (Pb1−aM1a−b), where M1is selected from the group consisting of group 3A elements, Li, Na, K, Mg, Ca, and Sr, and B is [(M21/3Nb2/3−c)αZrβTiγ], where M2is one or more elements capable of forming at least a perovskite structure in the ceramic material, or the formula PbxM31−x[(M41/3Nb2/3)e(Co1/3Nb2/3)f(Zn1/3Nb2/3)gZrhTii]O3, where M3denotes one or more elements selected from among the group consisting of La, K, Er, and Yb and M4denotes an element selected from among the group consisting of Ni, Mn, and Sr. The ceramic material can be prepared by sintering at a temperature of 950° C. or less and has good piezoelectric characteristics, in particularly good longitudinal elongation (d33) and a low dielectric loss factor (tan δ), even at a high Curie temperature (Tc), as well as a good electromechanical coupling factor (Kp).

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