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US4216103A
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High dielectric constant type ceramic composition consisting essentially of Pb(Fe1/2 Nb1/2)O3 -Pb(Mg1/3 Ta2/3)O3
Assignee: TDK Corp
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Filing: 1979-04-06
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Granted: 1980-08-05
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Expires: 1999-04-06
Abstract
Abstract A novel ceramic composition exhibiting a solid solution structure of Pb(Fe 1/2 Nb 178 )O 3 -Pb(Mg 1/3 Ta 2/3 )O 3 , can be sintered at a low sintering temperature; have a high insulation resistance; have a relatively high dielectric constant in the high dielectric type ceramic dielectrics, and; have a low dielectric loss. A particular amount of the additives, i.e., Pb(Mn 1/2 W 1/2 )O 3 , Pb(Mn 1/3 Nb 170 )O 3 , MnO, Pb(Mn 1/3 Ta 170 )O 3 , Li 2 O, Cr 2 O 3 and CeO 2 , is added into the composition mentioned above.
Inventors
- 👤 Shinobu Fujiwara
- 👤 Kiyoshi Furukawa
- 👤 Nobuaki Kikuchi
- 👤 Osamu Iizawa
- 👤 Hitoshi Tanaka
- 👤 Hisayoshi Ueoka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:10
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/495; C04B35/497
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
70 words
A high dielectric constant type-, ceramic composition, referred to as the basic ceramic composition, consisting essentially of from 60.72 to 67.17% of PbO, from 3.26 to 11.41% of Fe 2 O 3 , from 5.42 to 19.00% of Nb 2 O 5 , from 0.20 to 2.56% of MgO and from 2.22 to 28.04% of Ta 2 O 5 , all percentages being by weight based on the basic composition.
Claim 2
Dependent Claim
70 words
A high dielectric constant type-, ceramic composition, referred to as the basic ceramic composition, consisting essentially of from 60.72 to 67.17% of PbO, from 3.26 to 11.41% of Fe 2 O 3 , from 5.42 to 19.00% of Nb 2 O 5 , from 0.20 to 2.56% of MgO and from 2.22 to 28.04% of Ta 2 O 5 , all percentages being by weight based on the basic composition.
Claim 3
Dependent Claim
38 words
A high dielectric constant type-, ceramic composition according to claim 1, wherein the dielectric constant of the basic composition is from 5000 to 18,000 and the dielectric loss (tan δ at 1 KHz) is from 1.0 to 3.6%.
Claim 4
Dependent Claim
58 words
A high dielectric constant type-, ceramic composition according to claim 1, wherein the basic composition comprises from 64.0 to 65.0% of PbO, from 6.9 to 8.1% of Fe 2 O 3 , from 11.0 to 14.0% of Nb 2 O 5 , 1.1 to 1.6% of MgO, and from 12.0 to 16.0% of Ta 2 O 5 .
Claim 5
Dependent Claim
43 words
A high dielectric constant type-, ceramic composition according to claim 1, wherein said ceramic composition further comprises Pb(Mn 2/3 W 1/3 )O 3 in an amount of from 0.05 to 5.0 parts by weight based on 100 weight parts of the basic composition.
Claim 6
Dependent Claim
50 words
A high dielectric constant type-, ceramic composition according to claim 4, wherein said ceramic composition exhibits a dielectric constant of from approximately 5100 to 18,000, a dielectric loss (tan δ at 1 KHz) of from 0.3 to 2.0%, and an insulation resistance of from 1×10 9 to 6×10 11 Ω.
Claim 7
Dependent Claim
75 words
A high dielectric constant type, ceramic composition according to claim 4, wherein said Pb(Mn 2/3 W 1/3 )O 3 content is from 0.5 to 5.0 part by weight, and the basic composition is preferably from 64.53 to 67.17% by of PbO, from 8.08 to 11.41% of Fe 2 O 3 , from 13.45 to 19.00% of Nb 2 O 5 from 2.22 to 12.78% Ta 2 O 5 and from 0.20 to 1.16% of MgO.
Claim 8
Dependent Claim
95 words
A high dielectric constant type-, ceramic composition according to claim 6, wherein the basic composition comprises from 64.53 to 65% of PbO, from 8.08 to 9% of Fe 2 O 3 , from 13.45 to 14% of Nb 2 O 5 , from 1 to 1.16% of MgO and from 12 to 12.78% of Ta 2 O 5 , and said ceramic composition exhibits a dielectric constant of higher than 15,000, a dielectric loss (tan δ at 1 KHz) of less than approximately 1.0%, and an insulation resistance of not less than 4×10 11 Ω.
Claim 9
Dependent Claim
43 words
A high dielectric constant type-, ceramic composition according to claim 1, wherein said ceramic composition further comprises Pb(Mn 1/2 W 1/2 )O 3 in an amount of from 0.05 to 5.0 parts by weight based on 100 weight parts of the basic composition.
Claim 10
Dependent Claim
49 words
A high dielectric constant type-, ceramic composition according to claim 8, wherein said composition exhibits a dielectric constant of from approximately 5100 to 18,700, a dielectric loss (tan δ at 1 KHz) of from 0.2 to 2.0%, and an insulation resistance of 4 to 10 8 Ω or more.
Claim 11
Dependent Claim
101 words
A high dielectric constant type-, ceramic composition according to claim 8, the content of said Pb(Mn 1/2 W 1/2 )O 3 is from 0.05 to 5.0 parts by weight, and the basic composition is from 64.53 to 67.17% of PbO, from 8.08 to 11.41% of Fe 2 O 3 , from 13.45 to 19.00% of Nb 2 O 5 , from 2.22 to 12.78% of Ta 2 O 5 and from 0.20 to 1.16% of MgO, and said ceramic composition exhibits a dielectric loss (tan δ at 1 KHz) of 1.4% or less and the dielectric constant of more than 10,000.
Claim 12
Dependent Claim
71 words
A high dielectric constant type, ceramic composition according to claim 10, wherein the basic composition comprises from 64.53 to 65% of PbO, from 8.08 to 9% of Fe 2 O 3 , from 13.45 to 14% of Nb 2 O 5 , from 1.16 to 2% of MgO and from 12.78 to 13% of Ta 2 O 5 , and said ceramic composition exhibits a dielectric constant of more than 16,000.
Claim 13
Dependent Claim
43 words
A high dielectric constant type-, ceramic composition according to claim 1, wherein said ceramic composition further comprises Pb(Mn 1/3 Nb 2/3 )O 3 in an amount of from 0.05 to 5.0 parts by weight based on 100 weight parts of the basic composition.
Claim 14
Dependent Claim
50 words
A high dielectric constant type-, ceramic composition according to claim 12, wherein said ceramic composition exhibits a dielectric constant of from approximately 4900 to 17,600, a dielectric loss (tan δ at 1 KHz) of from 0.12 to 2.1%, and an insulation resistance of from 3×10 9 to 8×10 11 Ω.
Claim 15
Dependent Claim
88 words
A high dielectric constant type-, ceramic composition according to claim 13, wherein the content of said Pb(Mn 1/3 Nb 2/3 )O 3 is from 0.5 to 5.0 parts by weight, and the basic composition is from 64.53 to 67.17% by weight of PbO, from 8.08 to 11.41% by weight of Fe 2 O 3 , from 13.45 to 19.00% by weight of Nb 2 O 5 , from 0.20 to 1.16% by weight of MgO, and from 2.22 to 12.78% by weight of Ta 2 O 5 .
Claim 16
Dependent Claim
94 words
A high dielectric constant type-, ceramic composition according to claim 14, wherein the basic composition is from 64.53 to 65% by weight of PbO, from 8.08 to 9% by weight of Fe 2 O 3 , from 13.45 to 14% by weight of Nb 2 O 5 , from 1 to 1.16% by weight of MgO, and from 12 to 12.78% by weight of Ta 2 O 5 , and said ceramic composition exhibits a dielectric constant of more than 16,000 and a dielectric constant (tan δ at 1 KHz) of 1.2% or less.
Claim 17
Dependent Claim
39 words
A high dielectric constant type-, ceramic composition according to claim 1, wherein said ceramic composition further comprises MnO in an amount of from 0.001 to 1.0 part by weight based on 100 weight parts of the basic ceramic composition.
Claim 18
Dependent Claim
50 words
A high dielectric constant type-, ceramic composition according to claim 16, wherein said ceramic composition exhibits a dielectric constant of from approximately 7700 to 14,400 a dielectric loss (tan δ at 1 KHz) of from 0.5 to 2.0%, and an insulation resistance of from 9×10 9 to 7×10 10 Ω.
Claim 19
Dependent Claim
106 words
A high dielectric constant type-, ceramic composition according to claim 17, wherein the content of said MnO is from 0.001 to 0.1 part by weight, and the basic composition is from 64.45 to 65.56% PbO, from 6.92 to 9.83% of Fe 2 O 3 , from 11.51 to 15.62% of Nb 2 O 5 and from 0.79 to 1.55% of MgO, and from 8.66 to 15.57% of Ta 2 O 5 , and said ceramic composition exhibits the dielectric constant of more than 12,000 a dielectric loss (tan δ at 1 KHz) of 1.2% or less, and the insulation resistance of 4×10 10 Ω or more.
Claim 20
Dependent Claim
94 words
A high dielectric constant type-, ceramic composition according to claim 18, wherein the basic composition is preferably from 64 to 65.56% by weight of PbO, from 8 to 9.83% by weight of Fe 2 O 3 , from 13 to 14% by weight of Nb 2 O 5 , from 1 to 1.55% by weight of MgO, and from 12 to 13% by weight of Ta 2 O 5 , and said ceramic composition exhibits a dielectric constant of approximately 17,000 and the dielectric loss (tan δ at 1 KHz) of 0.9% or less.
Claim 21
Dependent Claim
44 words
A high dielectric constant type-, ceramic composition according to claim 1, wherein said ceramic composition further comprises Pb(Mn 1/3 Ta 2/3 )O 3 in an amount of from 0.05 to 5.0 parts by weight based on 100 weight parts of the basic ceramic composition.
Claim 22
Dependent Claim
49 words
A high dielectric constant type-, ceramic composition according to claim 20, said ceramic composition exhibits a dielectric constant of from approximately 4950 to 17,700, a dielectric loss (tan δ at 1 KHz) of from 0.1 to 2.2%, and an insulation resistance of from 4×10 9 to 4×10 11 Ω.
Claim 23
Dependent Claim
92 words
A high dielectric constant type-, ceramic composition according to claim 21, wherein the basic composition is from 64 to 65% by weight PbO, from 8 to 9% of Fe 2 O 3 , from 13 to 14% of Nb 2 O 5 from 1 to 2% of MgO, from 12 to 13% of Ta 2 O 5 , and said ceramic composition exhibits a dielectric loss (tan δ at 1 KHz) of 1.4% or less, an insulation resistance of 7×10 9 or more, and the dielectric constant is approximately 16,000 or more.
Claim 24
Dependent Claim
40 words
A high dielectric constant type-, ceramic composition according to claim 1, wherein said ceramic composition further comprises Li 2 O in an amount of from 0.01 to 2.0 parts by weight based on 100 weight parts of the basic composition.
Claim 25
Dependent Claim
36 words
A high dielectric constant type-, ceramic composition according to claim 23, wherein said ceramic composition exhibits a dielectric constant of from 5600 to 17,400, dielectric loss (tan δ at 1 KHz) of from 0.5 to 1.2%.
Claim 26
Dependent Claim
90 words
A high dielectric constant type-, ceramic composition according to claim 23, wherein the content of said Li 2 O is from 0.01 to 0.5 part by weight, and the basic composition is from 64 to 65% PbO, from 8 to 9% of Fe 2 O 3 , from 13 to 14% of Nb 2 O 5 and from 1 to 2% of MgO, and said ceramic composition exhibits a dielectric loss of (tan δ at 1 KHz) of 1.2% or less and the dielectric constnat of approximately 1000 or more.
Claim 27
Dependent Claim
53 words
A high dielectric constant type-, ceramic composition according to cliam 1, wherein said ceramic composition further comprises at least one member selected from the group consisting of Cr 2 O 3 and CeO 2 in an amount of from 0.05 to 2.0 parts by weight based on 100 parts of the basic composition.
Claim 28
Dependent Claim
53 words
A high dielectric constant type-, ceramic composition according to cliam 1, wherein said ceramic composition further comprises at least one member selected from the group consisting of Cr 2 O 3 and CeO 2 in an amount of from 0.05 to 2.0 parts by weight based on 100 parts of the basic composition.
Claim 29
Dependent Claim
50 words
A high dielectric constant type-, ceramic composition according to claim 26, wherein said ceramic composition exhibits a dielectric constant of from approximately 5000 to 10,300, a dielectric loss (tan δ at 1 KHz) of from 0.7 to 2.4%, and an insulation resistance of from 2×10 8 to 4×10 10 Ω.
Claim 30
Dependent Claim
76 words
A high dielectric constant type-, ceramic composition according to claim 26, wherein the content of said at least one member is from 0.05 to 2.0 part by weight, and the basic composition is from 67 to 68% of PbO, from 11 to 12% of Fe 2 O 3 , from 18 to 19% of Nb 2 O 5 and from 0.20 to 1.00% of MgO, and said ceramic composition exhibits a dielectric constant of approximately 10,000.
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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) | 1983-08-05 | 1984-02-04 | 1984-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-05 | 1988-02-04 | 1988-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-05 | 1992-02-04 | 1992-08-05 | $7700.00 | Window Closed / Lapsed |