US4830996A
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Ferroelectric ceramics
Assignee: MITSI PETROCHEMICAL INDUSTRIES Ltd 2-5 KASUMIGASEKI 3-CHOME CHIYODA-KU TOKYO JAPAN
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Filing: 1988-07-13
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Granted: 1989-05-16
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Expires: 2008-07-13
Abstract
Abstract Ferroelectric ceramics represented by xPbTiO 3 -yPbZrO 3 -zPb(Mg 1/3 Nb 2/3 )O 3 -mSrTiO 3 -nSnO 2 -pZnO-qBi 2 O 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 2 O 3 , Ta 2 O 5 , and Y 2 O 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.
Inventors
- 👤 Nobuki Hirai
- 👤 Yoshihisa Ushida
- 👤 Takao Ohno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:15
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/48; C04B35/49; C04B35/491; C04B35/493; H; H10; H10N; H10N30/00; H10N30/80; H10N30/85; H10N30/853
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
124 words
Ferroelectric ceramics represented by xPbTiO 3 --yPbZrO 3 --zPb(Mg 1/3 Nb 2/3 )O 3 --mSrTiO 3 --nSnO 2 --pZnO--qBi 2 O 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, X is at least one oxide selected from the group consisting of Dy 2 O 3 , Ta 2 O 5 , and Y 2 O 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.
Claim 2
Dependent Claim
124 words
Ferroelectric ceramics represented by xPbTiO 3 --yPbZrO 3 --zPb(Mg 1/3 Nb 2/3 )O 3 --mSrTiO 3 --nSnO 2 --pZnO--qBi 2 O 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, X is at least one oxide selected from the group consisting of Dy 2 O 3 , Ta 2 O 5 , and Y 2 O 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.
Claim 3
Dependent Claim
57 words
The ferroelectric ceramics according to claim 1 wherein x is from 0.30 to 0.45, y is from 0.10 to 0.60, z is from 0.10 to 0.60, m is from 0.05 to 0.10, n is from 0.01 to 0.02, p is from 0.01 to 0.02, q is from 0.01 to 0.02 and r is from 0.008 to 0.02.
Claim 4
Dependent Claim
99 words
Ferroelectric ceramics represented by xPbTiO 3 --yPbZrO 3 --zPb(Mg 1/3 Nb 2/3 )O 3 --mSrTiO 3 --nSnO 2 --pZnO--qBi 2 O 3 --rDy 2 O 3 wherein x, y, z, m, n, p, q and r represent amounts by mole, respectively, with the proviso that x+y+z being 1, 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.
Claim 5
Dependent Claim
99 words
Ferroelectric ceramics represented by xPbTiO 3 --yPbZrO 3 --zPb(Mg 1/3 Nb 2/3 )O 3 --mSrTiO 3 --nSnO 2 --pZnO--qBi 2 O 3 --rDy 2 O 3 wherein x, y, z, m, n, p, q and r represent amounts by mole, respectively, with the proviso that x+y+z being 1, 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.
Claim 6
Dependent Claim
57 words
The ferroelectric ceramics according to claim 3 wherein x is from 0.30 to 0.45, y is from 0.10 to 0.60, z is from 0.10 to 0.60, m is from 0.05 to 0.10, n is from 0.01 to 0.02, p is from 0.01 to 0.02, q is from 0.01 to 0.02 and r is from 0.008 to 0.02.
Claim 7
Dependent Claim
99 words
Ferroelectric ceramics represented by xPbTiO 3 --yPbZrO 3 --zPb(Mg 1/3 Nb 2/3 )O 3 --mSrTiO 3 --nSnO 2 --pZnO--qBi 2 O 3 --rTa 2 O 5 wherein x, y, z, m, n, p, q and r represent amounts by mole, respectively, with the proviso that x+y+z being 1, 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.
Claim 8
Dependent Claim
99 words
Ferroelectric ceramics represented by xPbTiO 3 --yPbZrO 3 --zPb(Mg 1/3 Nb 2/3 )O 3 --mSrTiO 3 --nSnO 2 --pZnO--qBi 2 O 3 --rTa 2 O 5 wherein x, y, z, m, n, p, q and r represent amounts by mole, respectively, with the proviso that x+y+z being 1, 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.
Claim 9
Dependent Claim
57 words
The ferroelectric ceramics according to claim 5 wherein x is from 0.30 to 0.45, y is from 0.10 to 0.60, z is from 0.10 to 0.60, m is from 0.05 to 0.10, n is from 0.01 to 0.02, p is from 0.01 to 0.02, q is from 0.01 to 0.02 and r is from 0.008 to 0.02.
Claim 10
Dependent Claim
99 words
Ferroelectric ceramics represented by xPbTiO 3 --yPbZrO 3 --zPb(Mg 1/3 Nb 2/3 )O 3 --mSrTiO 3 --nSnO 2 --pZnO--qBi 2 O 3 --rY 2 O 3 wherein x, y, z, m, n, p, q and r represent amounts by mole, respectively, with the proviso that x+y+z being 1, 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.
Claim 11
Dependent Claim
99 words
Ferroelectric ceramics represented by xPbTiO 3 --yPbZrO 3 --zPb(Mg 1/3 Nb 2/3 )O 3 --mSrTiO 3 --nSnO 2 --pZnO--qBi 2 O 3 --rY 2 O 3 wherein x, y, z, m, n, p, q and r represent amounts by mole, respectively, with the proviso that x+y+z being 1, 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.
Claim 12
Dependent Claim
57 words
The ferroelectric ceramics according to claim 7 wherein x is from 0.30 to 0.45, y is from 0.10 to 0.60, z is from 0.10 to 0.60, m is from 0.05 to 0.10, n is from 0.01 to 0.02, p is from 0.01 to 0.02, q is from 0.01 to 0.02 and r is from 0.008 to 0.02.
References Cited (Backward Citations)
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