US5013695A
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Dielectric ceramic composition
Assignee: Nippon Steel and Sumikin Electronics Devices Inc
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Filing: 1989-05-22
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Granted: 1991-05-07
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Expires: 2009-05-22
Abstract
Abstract A dielectric ceramic composition consisting essentially of barium oxide, titanium oxide, neodymium oxide and gadolinium oxide and which is expressed by the formula: aBaO-bTiO.sub.2 -c[(1-X)Nd.sub.2 O.sub.3 -XGd.sub.2 O.sub.3 ] wherein, 0.10≦a≦0.20, 0.65≦b≦0.75, 0.10≦c≦0.20, a+b+c=1 (a, b, and c are mole fractions), and O<X≦0.4 (X is a mole fraction of Gd 2 O 3 based on the total amount of Nd 2 O 3 and Gd 2 O 3 ). Al 2 O 3 may be added in an amount of not more than 4 parts by weight to 100 parts by weight of the dielectric ceramic composition.
Inventors
- 👤 Hiroshi Kato
- 👤 Shinsuke Yano
- 👤 Toshio Nonomura
- 👤 Susumu Nishigaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:18
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; H; H01; H01P; H01P7/00; H01P7/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
67 words
A dielectric ceramic composition consisting essentially of barium oxide, titanium oxide, neodymium oxide and gadolinium oxide and expressed by the formula: aBaO-bTiO.sub.2 -c[(1-X)Nd.sub.2 O.sub.3 -XGd.sub.2 O.sub.3 ] wherein, 0.10≦a≦0.20, 0.65≦b≦0.75, 0.10≦c≦0.20, a+b+c=1 (a, b, and c are mole fractions), and 0<X≦0.4 (X is a mole fraction of Gd 2 O 3 based on the total amount of Nd 2 O 3 and Gd 2 O 3 ).
Claim 2
Dependent Claim
67 words
A dielectric ceramic composition consisting essentially of barium oxide, titanium oxide, neodymium oxide and gadolinium oxide and expressed by the formula: aBaO-bTiO.sub.2 -c[(1-X)Nd.sub.2 O.sub.3 -XGd.sub.2 O.sub.3 ] wherein, 0.10≦a≦0.20, 0.65≦b≦0.75, 0.10≦c≦0.20, a+b+c=1 (a, b, and c are mole fractions), and 0<X≦0.4 (X is a mole fraction of Gd 2 O 3 based on the total amount of Nd 2 O 3 and Gd 2 O 3 ).
Claim 3
Dependent Claim
15 words
A dielectric ceramic composition as defined in claim 1, wherein 0.10≦a≦0.15, 0.65≦b≦0.70, 0.15≦c≦0.20, and 0.00<X≦0.30.
Claim 4
Dependent Claim
76 words
A dielectric ceramic composition consisting essentially of not more than 4 parts by weight of aluminum oxide and 100 parts by weight a composition which is expressed by the formula: aBaO-bTiO.sub.2 -c[(1-X)Nd.sub.2 O.sub.3 -XGd.sub.2 O.sub.3 ] wherein, 0.10≦a≦0.20, 0.65≦b≦0.75, 0.10≦c≦0.20, a+b+c=1 (a, b, and c are mole fractions), and 0<X≦0.4 (X is a mole fraction of Gd 2 O 3 based on the total amount of Nd 2 O 3 and Gd 2 O 3 ).
Claim 5
Dependent Claim
76 words
A dielectric ceramic composition consisting essentially of not more than 4 parts by weight of aluminum oxide and 100 parts by weight a composition which is expressed by the formula: aBaO-bTiO.sub.2 -c[(1-X)Nd.sub.2 O.sub.3 -XGd.sub.2 O.sub.3 ] wherein, 0.10≦a≦0.20, 0.65≦b≦0.75, 0.10≦c≦0.20, a+b+c=1 (a, b, and c are mole fractions), and 0<X≦0.4 (X is a mole fraction of Gd 2 O 3 based on the total amount of Nd 2 O 3 and Gd 2 O 3 ).
Claim 6
Dependent Claim
45 words
A dielectric ceramic composition as defined in claim 3, wherein 0.10≦a≦0.15, 0.65≦b≦0.70, 0.15≦c≦0.20, 0.00<X≦0.30, and O<Al 2 O 3 ≦4 parts by weight (per each 100 parts by weight of BaO-TiO 2 -(Nd 2 O 3 -Gd 2 O 3 ) system dielectric ceramic composition).
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