US4968649A
Expired / Lapsed
US
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Dielectric ceramic composition for use in high-frequency range and process for preparing the same
Assignee: FDK Corp
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Filing: 1989-12-08
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Granted: 1990-11-06
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Expires: 2009-12-08
Abstract
Abstract The present invention provides a dielectric ceramic composition for use in a high-frequency range represented by the general formula (1-x)Ba 1- y(Zn 1/3 , Ta 2/3 )O 3 +xBa 1-y ZrO 3 . In the formula, y is 0.004≦y≦0.013 and x is the amount of substitution of Ba 1-y ZrO 3 and 0<x≦0.06. This composition is prepared by weighing raw materials so that the mixing ratio of Ba is slightly smaller than that of the stoichiometric composition, calcining the resultant mixture to prepare a calcination product, grinding the calcination product through only dry process without conducting wet pulverization, molding the resultant powder, and sintering the molded product at 1600° to 1700° C. for 1 to 10 hr.
Inventors
- 👤 Michiaki Tsurumi
- 👤 Kenji Fujimoto
- 👤 Kazuaki Endo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:01
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0306; C; C04; C04B; C04B35/00; C04B35/01; C04B35/495; H01; H01B; H01B3/00; H01B3/02; H01B3/12; H01P; H01P7/00; H01P7/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
47 words
A dielectric ceramic composition for use in a high-frequency range represented by the general formula (1-x)Ba 1-y (Zn 1/3 , Ta 2/3 )O 3 +xBa 1-y ZrO 3 wherein y is 0.004≦y≦0.013 and x is the amount of substitution of Ba 1-y ZrO 3 and 0 <x≦0.06.
Claim 2
Dependent Claim
47 words
A dielectric ceramic composition for use in a high-frequency range represented by the general formula (1-x)Ba 1-y (Zn 1/3 , Ta 2/3 )O 3 +xBa 1-y ZrO 3 wherein y is 0.004≦y≦0.013 and x is the amount of substitution of Ba 1-y ZrO 3 and 0 <x≦0.06.
Claim 3
Dependent Claim
101 words
A process for preparing a dielectric ceramic composition which comprises weighing raw materials so as to have a composition represented by the formula (1-x)Ba 1-y (Zn 1/3 , Ta 2/3 )O 3 +xBa 1-y ZrO 3 wherein y is 0.004≦y≦0.013 and x is the amount of Ba 1-y ZrO 3 and 0<x≦0.06, mixing said raw materials, calcining the resultant mixture at about 1300° C. for about 10 hours to produce a calcination product, grinding the calcination product by a dry process, molding the resultant powder, and sintering the resulting molded product at 1600° to 1700° C. for 1 to 10 hr.
Claim 4
Dependent Claim
101 words
A process for preparing a dielectric ceramic composition which comprises weighing raw materials so as to have a composition represented by the formula (1-x)Ba 1-y (Zn 1/3 , Ta 2/3 )O 3 +xBa 1-y ZrO 3 wherein y is 0.004≦y≦0.013 and x is the amount of Ba 1-y ZrO 3 and 0<x≦0.06, mixing said raw materials, calcining the resultant mixture at about 1300° C. for about 10 hours to produce a calcination product, grinding the calcination product by a dry process, molding the resultant powder, and sintering the resulting molded product at 1600° to 1700° C. for 1 to 10 hr.
Claim 5
Dependent Claim
23 words
A process according to claim 2 wherein said raw materials comprise BaCO 3 , ZnO, Ta 2 O 5 and ZrO 2 .
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-11-05 | 1994-05-07 | 1994-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-11-05 | 1998-05-07 | 1998-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-11-05 | 2002-05-07 | 2002-11-06 | $7700.00 | Window Closed / Lapsed |