Piezoelectric element

Details Piezoelectric element Piezoelectric element

1996-06-13

1998-02-24

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310366, 252 629, H01L 4108

Patent

active

057214646

ABSTRACT:
The invention provides a novel type of piezoelectric element. This element comprises a number of piezoelectric layers of a ceramic material and a number of electrode layers of a silver-palladium alloy. The piezoelectric layers and the electrode layers are stacked alternately to form a multilayer. This multilayer is also provided with at least two external electrical connections which are in contact with a number of said electrode layers. In accordance with the invention, the composition of the main component of the ceramic material corresponds to the formula: Mg.sub.1/2).sub.z !O.sub.3,
where RE is at least one element selected from the group formed by La, Nd, Sm and Gd, and in which 0<u.ltoreq.0.025; 0.005.ltoreq.x.ltoreq.0.05; 0.44.ltoreq.y.ltoreq.0.52 and 0.015.ltoreq.z.ltoreq.0.1. Preferably, RE stands for La and 0.005<u<0.020. This material can be sintered at a low temperature and has a relatively high Curie temperature. It has further been found that the temperature-dependence of the piezoelectric properties is relatively small in the range around 150.degree. C. The invention also provides a method of manufacturing said piezoelectric elements as well as a novel ceramic composition having piezoelectric properties.

REFERENCES:
patent: 4564782 (1986-01-01), Ogawa
patent: 4918350 (1990-04-01), Ando et al.
patent: 5463266 (1995-10-01), Fukuoka et al.
patent: 5507898 (1996-04-01), Aoki et al.
"PZT-Based Multilayer Piezoelectric Ceramics with AgPd-Internal Electrodes", by W. Wersing et al, Ferroelctrics, 1988, vol. 87, pp. 271-294.

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