Ferroelectric ceramics

Details Ferroelectric ceramics Ferroelectric ceramics

1988-07-13

1989-05-16

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Titanate, zirconate, stannate, niobate, or tantalate or...

501135, 252 629, G04B 3549

Patent

active

048309966

ABSTRACT:
Ferroelectric ceramics represented by xPbTiO.sub.3 -yPbZrO.sub.3 -zPb(Mg.sub.1/3 Nb.sub.2/3)O.sub.3 -mSrTiO.sub.3 -nSnO.sub.2 -pZnO-qBi.sub.2 O.sub.3 -rX wherein x,y,z,m,n,p,q and r represent amounts by mole, respectively, with the proviso that x+y+z being 1, Z is at least one oxide selected from the group consisting of Dy.sub.2 O.sub.3, Ta.sub.2 O.sub.5, and Y.sub.2 O.sub.3, and wherein x is from 0.25 to 0.50, y is from 0.05 to 0.70, z is from 0.05 to 0.70, m is from 0 to 0.10, n is from 0 to 0.04, p is from 0 to 0.04, q is from 0 to 0.02 and r is from 0.005 to 0.02. The disclosed ferroelectric ceramics have increased relative dielectric constant and/or electromechanical coupling factor, and are suitable for use as actuators.

REFERENCES:
patent: 3956150 (1976-05-01), Duchi et al.
patent: 4716134 (1987-12-01), Yamaguchi et al.

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