Compositions – Piezoelectric
Patent
1993-12-09
1995-01-03
Bell, Mark L.
Compositions
Piezoelectric
501136, 501139, C04B 3548
Patent
active
053783824
ABSTRACT:
The present invention relates to a piezoelectric ceramic composition for actuator which is a composition comprising a basic composition containing lead, lanthanum, alkali earth metals, zirconium, titanium and oxygen in the formulation represented by the following general formula (I): ##EQU1## where A represents one or more element(s) selected from the group consisting of Ba, Ca and Sr; 0<x.ltoreq.0.07; 0.40.ltoreq.y.ltoreq.0.65; and 0<m.ltoreq.0.15, wherein the ceramic composition containing, relative to the basic composition, one or more element(s) selected from the group consisting of iron, aluminum, manganese, indium and tellurium in an amount of 0.02 to 0.3% by weight in terms of Fe.sub.2 O.sub.3 or Al.sub.2 O.sub.3, 0.02 to 0.2% by weight in terms of MnO.sub.2 and 0.02 to 0.5% by weight in terms of In.sub.2 O.sub.3 or TeO.sub.2. The composition according to the present invention is higher in piezoelectric strain constant and in Curie point, so that the element can be used over a wide range of temperature. This makes the composition useful as the material for piezoelectric actuators, contributing to various industrial application fields.
REFERENCES:
patent: 2960411 (1960-11-01), Brajer et al.
patent: 4367426 (1983-01-01), Kumada et al.
patent: 4716134 (1987-12-01), Yamaguchi et al.
patent: 4812698 (1989-03-01), Chida et al.
patent: 4843046 (1989-06-01), Yamaguchi et al.
patent: 4882078 (1989-11-01), Nishimura et al.
patent: 4994703 (1991-02-01), Oguri et al.
patent: 5034649 (1991-07-01), Chida et al.
patent: 5064596 (1991-11-01), Chida et al.
patent: 5171484 (1992-12-01), Nishimura et al.
patent: 5188992 (1993-02-01), Nishimura et al.
Journal of the American Ceramic Society, vol. 54, No. 1, Jan. 1971, pp. 1-11, "Hot-Pressed (Pb,La)(Zr,Ti)O3 Ferroelectric Ceramics for Electrooptic Applications" G. H. Haertling et al.
Ferroelectrics, 1982, vol. 41, pp. 143-156, S. Takahashi "Effects of Impurity Doping in Lead Zirconate-Titanate Ceramics".
Chida Yukio
Choda Takahiro
Nishimura Tetsuhiko
Bell Mark L.
Jones Deborah
Mitsubishi Kasei Corporation
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