Compositions for high power piezoelectric ceramics

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H01L 41/187 (2006.01) C04B 35/499 (2006.01)

Patent

CA 2603541

Piezoelectric ceramics of the formula Pb(1-z)MZ (Mg1/3Nb2/3) x (ZryTi1-y) 1- x.OMICRON.3 where M can be either Sr or Ba or both, and x is between 0.3 and 0.6, y is between 0.2 and 0.5, and z is between 0.04 and 0.08. The piezoelectric ceramic is provided as a composite perovskite structure, and may additionally include materials or dopants such as: PbO, HfO2, TeO2, WO3, V2O5, CdO, Tm2O3, Sm2O3, Ni2O3, and MnO2. The piezoelectric ceramics can be used to fabricate piezoelectric elements for a wide variety of devices that can be fabricated to exhibit high power applications including miniaturized displacement elements, buzzers, transducers, ultrasonic sensors and ultrasonic generators, and the like.

L'invention porte sur des céramiques piézoélectriques de la formule Pb(1-z)MZ (Mg1/3Nb2/3) x (ZryTi1-y) 1-x?3 où M peut être Sr et/ou Ba, x est compris entre 0,3 et 0,6, y est compris entre 0,2 et 0,5, et z est compris entre 0,04 et 0,08. La céramique piézoélectrique de l'invention se présente sous la forme d'une structure pérovskite composite, et peut en outre comprendre des matériaux ou dopants tels que: PbO, HfO2, TeO2, WO3, V2O5, CdO, Tm2O3, Sm2O3, Ni2O3, et MnO2. La céramique piézoélectrique précitée peut être utilisée pour fabriquer des éléments piézoélectriques pour une grande variété de dispositifs destinés à des applications de haute puissance, parmi lesquels des éléments de déplacement miniaturisés, des vibrateurs, des transducteurs, des capteurs ultrasonores et des générateurs ultrasonores et analogues.

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