Claims
- 1. A piezoelectric ceramic composition of the formula: x(Ba.sub.2 Sb.sub.2 O.sub.7).sub.1/2.(1-x)[y(PbTiO.sub.3)z(PbZrO.sub.3)] wherein 0.01.ltoreq.x.ltoreq.0.07; 0.47.ltoreq.y.ltoreq.0.51; 0.49.ltoreq.z.ltoreq.0.53 and y.+-.z=1.0 and containing 0.1-1.0 wt.% MnO.sub.2 and wherein said piezoelectric ceramic composition possesses a dielectric loss value tan .delta. less than 0.3%, an electromechanical coupling coefficient Kp of 60% to 74.5% and a dielectric constant .epsilon. value of 1000 to 1800 prepared by a process, comprising:
- individually forming lead titanate, lead zirconate and barium antimonate components by separately calcining mixtures of lead oxide-titanium oxide, lead oxide-zirconium oxide, and barium oxide-antimony oxide;
- mixing said components with MnO.sub.2 in an amount of 0.1 to 1.0 wt.% to provide a mixture in which said lead titanate, lead zirconate and barium antimonate are present in amounts that satisfy said formula; and
- sintering said mixture at a temperature greater than 1000.degree. C. to form said piezoelectric composition.
CROSS REFERENCE TO RELATED APPLICATIONS
This is a continuation, of application Ser. No. 709,714, filed July 29, 1976, now abandoned which is a continuation-in-part application Ser. No. 420,653, filed Nov. 30, 1973, now U.S. Pat. No. 4,087,366.
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3518199 |
Tsubovchi et al. |
Jun 1970 |
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3649540 |
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3661781 |
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Continuations (1)
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Number |
Date |
Country |
Parent |
709714 |
Jul 1976 |
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
420653 |
Nov 1973 |
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