Claims
- 1. A dielectric ceramic composition which consists essentially of: a main ceramic composition containing barium oxide, titanium oxide and rare earth oxide as major components, which composition is represented by xBaO.yTiO.sub.2.zRE.sub.2 O.sub.3 where RE represents at least one rare earth metal, 0.10.ltoreq.x.ltoreq.0.20, 0.60.ltoreq.y.ltoreq.0.75, 0.10.ltoreq.z.ltoreq.0.25, and x+y+z=1; and a glass composition composed of ZnO, B.sub.2 O.sub.3 and SiO.sub.2, which is represented by k(wt. %)ZnO. m(wt. %)B.sub.2 O.sub.3.n(wt. %)SiO2 where 30.ltoreq.k.ltoreq.85, 5.ltoreq.m.ltoreq.50, 2.ltoreq.n.ltoreq.40, k+m+n=100, said glass composition being contained in an amount of 0.1.about.18 parts by weight per 100 parts by weight of said main ceramic composition.
- 2. A dielectric ceramic composition according to claim 1, wherein said main ceramic composition further contains not more than 2.5 parts by weight of alumina per 100 parts by weight of a total amount of said major components.
- 3. A dielectric ceramic composition according to claim 2, wherein said alumina is contained in said main ceramic composition, in an amount of not more than 2 parts by weight per 100 parts by weight of the total amount of said major components.
- 4. A dielectric ceramic composition according to claim 1, wherein said main ceramic composition further contains not more than 3 parts by weight of manganese oxide per 100 parts by weight of a total amount of said major components.
- 5. A dielectric ceramic composition according to claim 4, wherein said manganese oxide is contained in said main ceramic composition, in an amount of not more than 2 parts by weight per 100 parts by weight of the total amount of said major components.
- 6. A dielectric ceramic composition according to claim 1, wherein said at least one rare earth metal represented by RE is selected from the group consisting of Nd, Sm, La, Ce and Pr.
- 7. A dielectric ceramic composition according to claim 6, wherein said at least one rare earth metal (RE) consists of Nd.
- 8. A dielectric ceramic composition according to claim 6, wherein said at least one rare earth metal (RE) is a combination of Nd and Sm and/or La.
- 9. A dielectric ceramic composition according to claim 1, wherein said glass composition consists of 40-75 wt. % of said ZnO (40.ltoreq.k.ltoreq.75), 10-40 wt. % of said B.sub.2 O.sub.3 (10.ltoreq.m.ltoreq.40), and 5-30 wt. % of said SiO.sub.2 (5.ltoreq.n.ltoreq.30).
Priority Claims (7)
Number |
Date |
Country |
Kind |
3-276587 |
Sep 1991 |
JPX |
|
4-092180 |
Mar 1992 |
JPX |
|
4-092182 |
Mar 1992 |
JPX |
|
4-098862 |
Mar 1992 |
JPX |
|
4-276594 |
Sep 1992 |
JPX |
|
4-276595 |
Sep 1992 |
JPX |
|
4-276596 |
Sep 1992 |
JPX |
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Parent Case Info
This is a division of application Ser. No. 07/948,585 filed Sep. 23, 1992, now U.S. Pat. No. 5,264,403.
US Referenced Citations (6)
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Entry |
Database WPI Week 7605, Derwent Publications Ltd., London, GB; AN 76-08845X & SU-A-460271 (A. V. Matvievskii) Aug. 7, 1975. |
Database WPI Week 7626, Derwent Publications Ltd., London, GB; AN 76-49610X & SU-A-494369 (A. V. Matvievskii) Dec. 8, 1975. |
Divisions (1)
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Number |
Date |
Country |
Parent |
948585 |
Sep 1992 |
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