Piezoelectric ceramic body for an electromechanical transducer
AssigneeU.S. Philips Corporation
InventorsDavid J. Perduijn, Jacobus Verberkt
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Abstract
Electromechanical transducer comprising a piezoelectric body consisting of Pb.sub.1--a M.sub.a (Mg.sub.(1--b) /.sub.3 Mn.sub.b/3 Sb.sub.2/3).sub.x Ti.sub.y Zr.sub.z O.sub.3, wherein M is one or more of the alkaline earth metals Ca, Sr and Ba, and wherein 0.ltoreq.a.ltoreq.0.15, 0.ltoreq.b.ltoreq.0.20, 0.01.ltoreq.x.ltoreq.0.25, 0.40.ltoreq.y.ltoreq.0.55, 0.20.ltoreq.z.ltoreq.0.59 and (x+y+z)=1. This material has the advantage that polarization is effected in a very short period of time at room temperature.
Claims2
An electromechanical transducer comprising a piezoelectric body corresponding to the ternary system lead titanate-lead zirconate--Pb(M.sup.II.sub.1/3 M.sup.V.sub.2/3)O.sub.3, and electrodes attached to said body, characterized in that said piezoelectric body consists of Pb.sub.1-a M.sub.a (Mg.sub.(1-b)/3 Mn.sub.b/3 Sb.sub.2/3).sub.x Ti.sub.y Zr.sub.z O.sub.3, wherein M is one or more of the alkaline earth metals Ca, Sr and Ba, and wherein
- 0.ltoreq.a.ltoreq.0.15,
- 0.ltoreq.b.ltoreq.0.20,
- 0.01.ltoreq.x.ltoreq.0.25,
- 0.40.ltoreq.y.ltoreq.0.55,
- 0.20.ltoreq.z.ltoreq.0.59 and
- (x+y+z)=1.
Dependencies are inferred from the claim text.