Patent US4287075A successfully refreshed from Google Patents.
US4287075A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High dielectric constant type ceramic composition consisting essentially of Pb(Fe1/2 Nb1/2)O3 -Pb(Mg1/3 Nb2/3)O3 -Pb(Mg1/2 W1/2)O3
Assignee: TDK Corp
•
Filing: 1979-04-16
•
Granted: 1981-09-01
•
Expires: 1999-04-16
Abstract
Abstract A novel ceramic composition exhibiting a solid solution structure of Pb(Fe1/2Nb1/2)O3-Pb(Mg1/3Nb2/3)O3-Pb(Mg1/2W1/2)O3, 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-(Mn2/3W1/3)O3, Pb(Mb1/2W1/2)O3+L, Pb(Mn1/2Nb2/3)O3, MnO, Pb(Mn1/3Ta2/3)O3, Li2O, Cr2O3 and CeO2, 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
2026-10-28 22:25
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/495; C04B35/497
Claims Analysis
Total Claims: 42
Claim 1
Independent Claim
95 words
A high dielectric constant type-, ceramic composition hereinafter referred to as the basic ceramic composition, which comprises from 64.80 to 68.58% of PbO, from o to 11.46% of Fe 2 O 3 , from 0.3 to 3.92% of MgO, from 9.65 to 26.89% of Nb 2 O 5 and from 0 to 16.83% of WO 3 , all percentages being by weight based on the basic ceramic composition, and wherein the basic composition falls within the area defined by the polygon A-B-C-D-E of FIG. 1 attached to the specification but not including the lines A-B-C-D-E.
Claim 2
Dependent Claim
95 words
A high dielectric constant type-, ceramic composition hereinafter referred to as the basic ceramic composition, which comprises from 64.80 to 68.58% of PbO, from o to 11.46% of Fe 2 O 3 , from 0.3 to 3.92% of MgO, from 9.65 to 26.89% of Nb 2 O 5 and from 0 to 16.83% of WO 3 , all percentages being by weight based on the basic ceramic composition, and wherein the basic composition falls within the area defined by the polygon A-B-C-D-E of FIG. 1 attached to the specification but not including the lines A-B-C-D-E.
Claim 3
Dependent Claim
38 words
A high dielectric constant type-, ceramic composition according to claim 1, wherein the basic composition exhibits a dielectic constant of approximately from 6000 to 23000, a dielectric loss (tan δ at 1 KHz) of from 0.9 to 2.7%.
Claim 4
Dependent Claim
66 words
A high dielectric constant type-, ceramic composition according to claim 1, wherein said basic ceramic composition comprises from 66.45 to 68.08% of PbO, from 3.41 to 9.73% of Fe 2 O 3 , 0.99 to 3.03% of MgO, from 16.03 to 24.06% of Nb 2 O 5 and from 1.42 to 7.93% of WO 3 , and exhibits a dielectric constant of more than approximately 15000.
Claim 5
Dependent Claim
67 words
A high dielectric constant type-, ceramic composition according to claim 3, wherein said basic ceramic composition comprises from 66.7 to 67.2% of PbO, from 8.5 to 9.8% of Fe 2 O 3 , from 17.0 to 18.4% of Nb 2 O 5 , from 0.99 to 1.5% of MgO and from 3.8 to 6.0% of WO 3 and exhibits a dielectric constant of approximately 20000 or more.
Claim 6
Dependent Claim
45 words
A high dielectric constant type-, ceramic composition according to claim 1, wherein said ceramic composition comprises the basic ceramic composition, and 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 7
Dependent Claim
51 words
A high dielectric constant type-, ceramic composition according to claim 5, wherein said composition exhibits a dielectric constant (ε s) of from approximately 5200 to 22300 a dielectric loss (tan δ at 1 KHz) of from 0.6 to 1.3%, and an insulation resistance of from 2×10 10 to 5×10 10 Ω.
Claim 8
Dependent Claim
45 words
A high dielectric constant type-, ceramic composition according to claim 3, wherein said ceramic composition comprises the basic ceramic composition and 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 9
Dependent Claim
73 words
A high dielectric constnat type-, ceramic composition according to claim 7, wherein the basic ceramic composition comprises from 66.79 to 67.66% of PbO, from 7.26 to 8.60% if Fe 2 O 3 , from 17.24 to 21.22% of Nb 2 O 5 and from 1.47 to 1.75% of MgO, and from 2.11 to 5.90% of WO 3 , and the content of MnO is from 0.001 to less than 0.5 part by weight.
Claim 10
Dependent Claim
44 words
A high dielectric constant type-, ceramic composition according to claim 4, wherein said ceramic composition comprises the basic composition and 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 11
Dependent Claim
50 words
A high dielectric constant type-, ceramic composition according to claim 1, wherein said ceramic composition comprises, the basic ceramic composition and 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 ceramic composition.
Claim 12
Dependent Claim
50 words
A high dielectric constant type-, ceramic composition according to claim 10, wherein said ceramic composition exhibits a dielectric constant of from approximately 4600 to 17200, a dielectric loss (tan δ at 1 KHz) of from 0.7 to 1.8%, and an insulation resistance of from 2×10 10 to 6×10 10 Ω.
Claim 13
Dependent Claim
102 words
A high dielectric constant type-, ceramic composition according to claim 10, the content of said Pb(Mn 2/3 W 1/3 )O 3 is from 0.05 to 0.5 part by weight, and the basic ceramic composition comprises from 67.49 to 67.66% of PbO, from 7.26 to 10.14% of Fe 2 O 3 , from 19.85 to 21.22% of Nb 2 O 5 , from 0.76 to 1.75% of MgO, and from 1.76 to 2.11% of WO 3 , and said ceramic composition exhibits as dielectric loss (tan δ at 1 KHz) of 1.8% or less and a dielectric constant is approximately 10000 or more.
Claim 14
Dependent Claim
52 words
A high dielectric constant type-, ceramic composition according to claim 3 or 4, wherein said ceramic composition comprises the basic ceramic composition and further comprises Pb(Mn 2/3 W 1/3 )O 3 in an amount of from 0.05 to 0.5 part by weight based on 100 weight parts of the basic ceramic composition.
Claim 15
Dependent Claim
50 words
A high dielectric constant type-, ceramic composition according to claim 1, wherein said ceramic composition comprises the basic ceramic composition, and 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 ceramic composition.
Claim 16
Dependent Claim
50 words
A high dielectric constant type-, ceramic composition according to claim 14, wherein said ceramic composition exhibits a dielectric constant of from approximately 4700 to 17300, a dielectric loss (tan δ at 1 KHz) of from 0.6 to 1.9%, and an insulation reistance of from 1×10 10 to 4×10 10 Ω.
Claim 17
Dependent Claim
102 words
A high dielectric constant type-, ceramic composition according to claim 14, wherein the basic ceramic composition comprises from 67.49 to 67.66% of PbO, from 7.26 to 10.14% of Fe 2 O 3 , from 19.85 to 21.22% of Nb 2 O 5 , from 0.76 to 1.75% of MgO and from 1.76 to 2.11% of WO 3 , the content of said Pb(Mn 1/2 W 1/2 )O 3 is from 0.05 to 0.5 part by weight and said ceramic composition exhibits a dielectric constant of approximately 10000 or more and a dielectric loss (tan δ at 1 KHz) of 1.3% or less.
Claim 18
Dependent Claim
52 words
A high dielectric constant type-, ceramic composition according to claim 3 or 4, wherein said ceramic composition comprises the basic ceramic composition, and further comprises Pb(Mn 1/2 W 1/2 )O 3 in an amount of from 0.05 to 0.5 part by weight based on 100 weight parts of the basic ceramic composition.
Claim 19
Dependent Claim
50 words
A high dielectric constant type-, ceramic composition according to claim 1, wherein said ceramic composition comprises the basic ceramic composition, and 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 part of the basic ceramic composition.
Claim 20
Dependent Claim
50 words
A high dielectric constant type-, ceramic composition according to claim 18, wherein said ceramic composition exhibits a dielectric constant of from approximately 4800 to 17200, a dielectric loss (tan δ at 1 KHz) of from 0.4 to 2%, and an insulation resistance of from 2×10 10 to 6×10 10 δ.
Claim 21
Dependent Claim
50 words
A high dielectric constant type-, ceramic composition according to claim 3, wherein said ceramic composition comprises the basic ceramic composition, and further comprises Pb(Mn 1/3 Nb 2/3 )O 3 in an amount of from 0.05 to 0.5 parts by weight based on 100 weight parts of the basic ceramic composition.
Claim 22
Dependent Claim
58 words
A high dielectric constant type-, ceramic composition according to claim 20, wherein said basic ceramic composition comprises from 67.49 to 67.66% of PbO, from 7.26 to 10.14% of Fe 2 O 3 , from 19.85 to 21.22% of Nb 2 O 5 , from 0.76 to 1.75% of MgO and from 1.76 to 2.11% of WO 3 .
Claim 23
Dependent Claim
50 words
A high dielectric constant type-, ceramic composition according to claim 4, wherein said ceramic composition comprises the basic ceramic composition and further comprises Pb(Mn 1/3 Nb 2/3 )O 3 in an amount of from 0.05 to 0.5 parts by weight based on 100 weight parts of the basic ceramic composition.
Claim 24
Dependent Claim
50 words
A high dielectric constant type-, ceramic composition according to claim 1, wherein said ceramic composition comprises the basic ceramic composition and 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 25
Dependent Claim
50 words
A high dielectric constant type-, ceramic composition according to claim 23, wherein said ceramic composition exhibits a dielectric constant of from approximately 4360 to 18200, a dielectric loss (tan δ at 1 KHz) of from 0.4 to 1.7% and an insulation resistance of from 1×10 10 to 6×10 10 Ω.
Claim 26
Dependent Claim
50 words
A high dielectric constant type-, ceramic composition according to claim 3, wherein said ceramic composition comprises the basic ceramic composition, and further comprises Pb(Mn 1/3 Ta 2/3 )O 3 in an amount of from 0.05 to 0.5 parts by weight based on 100 weight parts of the basic ceramic composition.
Claim 27
Dependent Claim
58 words
A high dielectric constant type-, ceramic composition according to claim 25, wherein said basic composition comprises preferably from 67.49 to 67.66% of PbO, from 7.26 to 10.14% of Fe 2 O 3 , from 19.85 to 21.22% of Nb 2 O 5 , from 0.76 to 1.75% of MgO and from 1.76 to 2.11% of WO 3 .
Claim 28
Dependent Claim
50 words
A high dielectric constant type-, ceramic composition according to claim 4, wherein said ceramic composition comprises the basic ceramic composition, and further comprises Pb(Mn 1/3 Ta 2/3 )O 3 in an amount of from 0.05 to 0.5 parts by weight based on 100 weight parts of the basic ceramic composition.
Claim 29
Dependent Claim
47 words
A high dielectric constant type-, ceramic composition according to claim 1, wherein said ceramic composition comprises the basic ceramic composition, and 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 ceramic composition.
Claim 30
Dependent Claim
39 words
A high dielectric constant type-, ceramic composition according to claim 28, wherein said ceramic composition exhibits a dielectric constant of from approximately 9000 to 22000, and a dielectric loss (tan δ at 1 KHz) of from 0.7 to 1.5%.
Claim 31
Dependent Claim
85 words
A high dielectric constant type-, ceramic composition according to claim 29, wherein said basic ceramic composition comprises from 66.7% to 67.51% of PbO, from 5.43 to 8.60% of Fe 2 O 3 , from 17.24 to 21.11% of Nb 2 O 5 , from 1.47 to 2.44% of MgO and from 3.51 to 5.90% of WO 3 , content of said Li 2 O is from 0.01 to 0.1 part by weight, and said ceramic composition exhibits a dielectric constant of approximately 14000 or more.
Claim 32
Dependent Claim
70 words
A high dielectric constant type-, ceramic composition according to claim 30, wherein said basic ceramic composition comprises from 66.79 to 67.00% of PbO, from 8.00 to 8.60% of Fe 2 O 3 , 17.24 to 18.00% of Nb 2 O 5 , from 1.47 to 1.60% of Mgo and from 5.00 to 5.90% of WO 3 , and the content of said Li 2 O is from 0.01 to 0.05.
Claim 33
Dependent Claim
60 words
A high dielectric constant type-, ceramic composition according to claim 1, wherein said ceramic composition comprises the basic ceramic composition, and 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 ceramic composition.
Claim 34
Dependent Claim
50 words
A high dielectric constant type-, ceramic composition according to claim 32, wherein said ceramic composition exhibits a dielectric constant of from approximately 6620 to 23800, a dielectric loss (tan δ at 1 KHz) of from 0.8 to 2.6%, and an insulation resistance of from 2×10 9 to 9×10 10 Ω.
Claim 35
Dependent Claim
60 words
A high dielectric constant type-, ceramic composition according to claim 3, wherein said ceramic composition comprises the basic ceramic composition, and further comprises at least one member selected from the group consisting of Cr 2 O 3 and CeO 2 in an amount of from 0.5 to 1.0 parts by weight based on 100 parts of the basic ceramic composition.
Claim 36
Dependent Claim
58 words
A high dielectric constant type-, ceramic composition according to claim 34, wherein said basic ceramic composition comprises from 66.79 to 67.66% of PbO, from 7.26 to 8.60% of Fe 2 O 3 , from 17.24 to 21.22% of Nb 2 O 5 and from 1.47 to 1.75% of MgO, and from 2.11 to 5.90% of WO 3 .
Claim 37
Dependent Claim
60 words
A high dielectric constant type-, ceramic composition according to claim 4, wherein said ceramic composition comprises the basic ceramic composition, and further comprises at least one member selected from the group consisting of Cr 2 O 3 and CeO 2 in an amount of from 0.5 to 1.0 part by weight based on 100 parts of the basic ceramic composition.
Claim 38
Dependent Claim
38 words
A high dielectric constant type-, ceramic composition according to claim 1, wherein the basic composition exhibits a dielectric constant of approximately from 6000 to 23000, a dielectric loss (tan δ at 1 KHz) of from 0.9 to 2.7%.
Claim 39
Dependent Claim
50 words
A high dielectric constant type-, ceramic composition according to claim 1, wherein said ceramic composition comprises the basic ceramic composition, and 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 part of the basic ceramic composition.
Claim 40
Dependent Claim
50 words
A high dielectric constant type-, ceramic composition according to claim 38, wherein said ceramic composition exhibits a dielectric constant of from approximately 4800 to 17200, a dielectric loss (tan δ at 1 KHz) of from 0.4 to 2%, and an insulation resistance of from 2×10 10 to 6×10 10 Ω.
Claim 41
Dependent Claim
50 words
A high dielectric constant type-, ceramic composition according to claim 1, wherein said ceramic composition comprises the basic ceramic composition and 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 42
Dependent Claim
50 words
A high dielectric constant type-, ceramic composition according to claim 40, wherein said ceramic composition exhibits a dielectric constant of from approximately 4360 to 18200, a dielectric loss (tan δ at 1 KHz) of from 0.4 to 1.7% and an insulation resistance of from 1×10 10 to 6×10 10 Ω.
References Cited (Backward Citations)
US2805165A
Cited
US3116262A
Cited
US3464785A
Cited
US3600652A
Cited
US3666665A
Cited
US4078938A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-31 | 1985-03-02 | 1985-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-31 | 1989-03-02 | 1989-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-31 | 1993-03-02 | 1993-09-01 | $7700.00 | Window Closed / Lapsed |