US4544644A
Expired / Lapsed
US
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High dielectric constant type ceramic composition
Assignee: Toshiba Corp
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Filing: 1984-03-26
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Granted: 1985-10-01
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Expires: 2004-03-26
Abstract
Abstract There is disclosed a high dielectric constant material which comprises a composite material comprising at least one of BaO and CaO; PbO; Fe 2 O 3 ; Nb 2 O 5 ; WO 3 and CuO, said composite material being represented by the general formula: xPb(Fe.sub.1/2 Nb.sub.1/2 l )O.sub.3 -yM(Cu.sub.1/2 W.sub.1/2 )O.sub.3 -zPb(Fe 2/3 W 1/3 )O 3 wherein M is at least one of Ba and Ca, and x, y and z are defined in the specification. The disclosed dielectric material can also contain 0 to 1.0% by weight, relative to said composite material, of manganese oxide.
Inventors
- 👤 Youhachi Yamashita
- 👤 Takashi Takahashi
- 👤 Mituo Harata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:46
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H01G4/1209; H01G4/1254; C; C04; C04B; C04B35/00; C04B35/01; C04B35/495; C04B35/497; H01B; H01B3/00; H01B3/02; H01B3/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
110 words
A ceramic composition having a high dielectric constant consisting essentially of lead oxide, iron oxide, niobium oxide, tungsten oxide, copper oxide, and at least one of barium oxide and calcium oxide, said ceramic composition being represented by the formula: xPb(Fe.sub.1/2 Nb.sub.1/2)O.sub.3 -yM(Cu.sub.1/2 W.sub.1/2)O.sub.3 -zPb(Fe.sub.2/3 W.sub.1/3)O.sub.3 wherein M is at least one of Ba and Ca, and wherein x, y and z are defined as follows: ______________________________________
[A:] x = 65, y = 5, z = 30, or
[B:] x = 90, y = 10, z = 0, or
[C:] x = 65, y = 0.5, z = 34.5, or
[D:] x = 99.5, y = 0.5, z = 0
______________________________________
Claim 2
Dependent Claim
110 words
A ceramic composition having a high dielectric constant consisting essentially of lead oxide, iron oxide, niobium oxide, tungsten oxide, copper oxide, and at least one of barium oxide and calcium oxide, said ceramic composition being represented by the formula: xPb(Fe.sub.1/2 Nb.sub.1/2)O.sub.3 -yM(Cu.sub.1/2 W.sub.1/2)O.sub.3 -zPb(Fe.sub.2/3 W.sub.1/3)O.sub.3 wherein M is at least one of Ba and Ca, and wherein x, y and z are defined as follows: ______________________________________
[A:] x = 65, y = 5, z = 30, or
[B:] x = 90, y = 10, z = 0, or
[C:] x = 65, y = 0.5, z = 34.5, or
[D:] x = 99.5, y = 0.5, z = 0
______________________________________
Claim 3
Dependent Claim
32 words
A ceramic composition according to claim 1, wherein said ceramic composition is represented by the formula: xPb(Fe.sub.1/2 Nb.sub.1/2)O.sub.3 -yM(Cu.sub.1/2 W.sub.1/2)O.sub.3 wherein x and y satisfy the relations of 90≦x≦99.5 and 0.5≦y≦10, respectively.
Claim 4
Dependent Claim
25 words
A ceramic composition according to claim 2, further consisting essentially of 1.0% by weight or less, with respect to said ceramic composition, of manganese oxide.
Claim 5
Dependent Claim
25 words
A ceramic composition according to claim 1, further consisting essentially of 1.0% by weight or less, with respect to said ceramic composition, of manganese oxide.
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