US 4,062,790 A · Piezoelectric ceramic compositions

Abstract

Piezoelectric ceramic compositions having very high mechanical quality factors, high electromechanical coupling coefficients and high durabilities of the piezoelectric constants with cycling of mechanical impact, and comprising the quaternary system Pb(Zn.sub.1/3 Nb.sub.2/3)O.sub.3 -Pb(Mn.sub.1/3 Nb.sub.2/3)O.sub.3 -PbTiO.sub.3 -PbZrO.sub.3.

Claims2

Dependent claims

A piezoelectric ceramic composition consisting essentially of a material represented by the formula:

Pb(Zn.sub.1/3 Nb.sub.2/3).sub.0.06 (Mn.sub.1/3 Nb.sub.2/3).sub.0.06 Ti.sub.0.44 Zr.sub.0.44 O.sub.3.

Dependencies are inferred from the claim text.

Facts

Application

05/391,483Filed 24 Aug 1973 · continuation in part

Priority

JA 46-54788 Feb 1971

Granted

13 Dec 1977

Term ends

Not estimatedThe source records don’t support an estimate.

Classification8 codes

H10N 30/853
Piezoelectric or electrostrictive active materials: ceramic compositions
C04B 35/46
Based on oxide ceramics: based on titanium oxides or titanates
C04B 35/48
Based on oxide ceramics: based on zirconium or hafnium oxides, zirconates, zircon or hafnates
C04B 35/493
Based on lead zirconates and lead titanates , e.g. PZT: containing also other lead compounds

Piezoelectric ceramic compositions

Life of this patent

Abstract

Claims2

Piezoelectric ceramic compositions

Life of this patent

Abstract

Claims2