US4054531A
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Ceramic dielectric composition
Assignee: TDK Corp
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Filing: 1975-11-03
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Granted: 1977-10-18
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Expires: 1995-11-03
Abstract
Abstract A ceramic dielectric composition is provided which consists essentially of bismuth titanate with substituents, expressed by the formula: Bi.sub.4-x Me.sub.x Ti.sub.3-y R.sub.y O.sub.12 where R is at least one divalent metal selected from strontium, barium and lead, Me is at least one pentavalent metal selected from tantalum, niobium and antimony, and both x and y are numbers falling within the range of 0.4 to 2.0 and the ratio of x/y is within the range of 0.9 to 1.1. This composition may contain specified metal oxide additives. The ceremic dielectric composition is sintered at a relatively low temperature, and exhibits a dielectric constant having a reduced dependence upon temperature variations over a wide use range, a reduced dielectric loss, enhanced resistivity and breakdown voltage.
Inventors
- 👤 Koji Takahashi
- 👤 Norishige Yamaguchi
- 👤 Makoto Hori
- 👤 Masamichi Turuta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:46
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/02; H01B3/12; C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/475; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H01G4/1209; H01G4/1254; H01G4/1263
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
154 words
A ceramic dielectric composition consisting essentially of ( 1) bismuth titanate with substituents, expressed by the formula: Bi.sub.4-x Me.sub.x Ti.sub.3-y R.sub.y O.sub.12 where Me is at least one divalent metal selected from the group consisting of strontinum, barium and lead, R is at least one pentavalent metal selected from the group consisting of tantalum, niobium and antimony, and both x and y are numbers falling within the range of 0.4 to 2.0 and the ratio of x/y is within the range of 0.9 to 1.1, and; (2) at least one metal oxide selected from the group consisting of tungsten oxide and molybdenum oxide in an amount of 0.01 to 2.0% by weight based on the weight of the aforesaid component (1) of the formula Bi 4-y Me x Ti 3-y R y O 12 and expressed in terms of the amount of tungsten trioxide (WO 3 ) and molybdenum trioxide (MoO 3 ), respectively.
Claim 2
Dependent Claim
154 words
A ceramic dielectric composition consisting essentially of ( 1) bismuth titanate with substituents, expressed by the formula: Bi.sub.4-x Me.sub.x Ti.sub.3-y R.sub.y O.sub.12 where Me is at least one divalent metal selected from the group consisting of strontinum, barium and lead, R is at least one pentavalent metal selected from the group consisting of tantalum, niobium and antimony, and both x and y are numbers falling within the range of 0.4 to 2.0 and the ratio of x/y is within the range of 0.9 to 1.1, and; (2) at least one metal oxide selected from the group consisting of tungsten oxide and molybdenum oxide in an amount of 0.01 to 2.0% by weight based on the weight of the aforesaid component (1) of the formula Bi 4-y Me x Ti 3-y R y O 12 and expressed in terms of the amount of tungsten trioxide (WO 3 ) and molybdenum trioxide (MoO 3 ), respectively.
Claim 3
Dependent Claim
22 words
A ceramic dielectric composition according to claim 1 wherein x and y are numbers falling within the range of 0.8 to 1.4.
Claim 4
Dependent Claim
21 words
A ceramic dielectric composition according to claim 1 wherein Me is strontium and R is a combination of niobium and tantalum.
Claim 5
Dependent Claim
21 words
A cermic dielectric composition according to claim 1 wherein the amount of said metal oxide is 0.01 to 0.5% by weight.
Claim 6
Dependent Claim
152 words
A ceramic dielectric composition consisting essentially of: (1) bismuth titanate with substituents, expressed by the formula: Bi.sub.4-x Me.sub.x Ti.sub.3-y R.sub.y O.sub.12 where Me is at least one divalent metal selected from the group consisting of strontium, barium and lead, R is at least one pentavalent metal selected from the group consisting of tantalum, niobium and antimony, and both x and y are positive numbers falling within the range of 0.4 to 2.0 and the ratio of x/y is within the range of 0.9 to 1.1; (2) at least one metal oxide selected from tungsten oxide and molybdenum oxide in an amount of 0.01 to 2.0% by weight based on the weight of the aforesaid component (1) and expressed in terms of the amount of tungsten trioxide (WO 3 ) and molybdenum trioxide (MoO 3 ), respectively, and; (3) 0.1 to 10.0 moles of lead titanate per mole of the aforesaid component (1).
Claim 7
Dependent Claim
152 words
A ceramic dielectric composition consisting essentially of: (1) bismuth titanate with substituents, expressed by the formula: Bi.sub.4-x Me.sub.x Ti.sub.3-y R.sub.y O.sub.12 where Me is at least one divalent metal selected from the group consisting of strontium, barium and lead, R is at least one pentavalent metal selected from the group consisting of tantalum, niobium and antimony, and both x and y are positive numbers falling within the range of 0.4 to 2.0 and the ratio of x/y is within the range of 0.9 to 1.1; (2) at least one metal oxide selected from tungsten oxide and molybdenum oxide in an amount of 0.01 to 2.0% by weight based on the weight of the aforesaid component (1) and expressed in terms of the amount of tungsten trioxide (WO 3 ) and molybdenum trioxide (MoO 3 ), respectively, and; (3) 0.1 to 10.0 moles of lead titanate per mole of the aforesaid component (1).
Claim 8
Dependent Claim
22 words
A ceramic dielectric composition according to claim 5 wherein x and y are numbers falling within the range of 0.8 to 1.4.
Claim 9
Dependent Claim
21 words
A ceramic dieletric composition according to claim 5 wherein Me is strontium and R is a combination of niobium and tantalum.
Claim 10
Dependent Claim
25 words
A ceramic dielectric composition according to claim 5 wherein the amount of lead titanate is 0.1 to 2.5 moles per mole of said component (1).
Claim 11
Dependent Claim
21 words
A ceramic dielectric composition according to claim 5 wherein the amount of said metal oxide is 0.01 to 0.5% by weight.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-17 | 1981-04-18 | 1981-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-17 | 1985-04-18 | 1985-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-17 | 1989-04-18 | 1989-10-18 | $7700.00 | Window Closed / Lapsed |