EP0261419A2
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EP
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Semiconductive ceramic composition
Assignee: TDK Corp
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Filing: 1987-08-25
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Granted: —
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Expires: 2007-08-25
Abstract
Abstract A semiconductive ceramic composition for a boundary insulation type semiconductive ceramic capacitor capable of causing the capacitor to exhibit increased dielectric constant, satisfactory frequency and temperature characteristics, and decreased dielectric loss. The composition includes a SrTiO₃ base component and a minor component consisting of CaTiO₃, Y and Nb. The composition may further contain Mn and SiO₂, which contribute to an increase in insulation resistance of the capacitor and enlargement of an appropriate range of a (SrO + CaO)/TiO₂, respectively. Also, a composition includes a SrTiO₃ base component and a minor component consisting of CaTiO₃, BaTiO₃, Y and Nb.
Inventors
- 👤 Shuichi Ono
- 👤 Shuichi Itagaki
- 👤 Masahiro Yahagi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 16:46
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H01G4/1272; H01G4/1281; C04B35/462; C04B35/465; C04B35/47
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
51 words
A semiconductive ceramic composition comprising: a base component comprising SrTiO₃; and a minor component comprising CaTiO₃, Y and Nb; said CaTiO₃ being present in an amount of 0.1 to 2.0 mol% and said Y and Nb being present in amounts of 0.1 to 0.4 mol% on Y₂O₃ and Nb₂O₅ bases, respectively.
Claim 2
Dependent Claim
51 words
A semiconductive ceramic composition comprising: a base component comprising SrTiO₃; and a minor component comprising CaTiO₃, Y and Nb; said CaTiO₃ being present in an amount of 0.1 to 2.0 mol% and said Y and Nb being present in amounts of 0.1 to 0.4 mol% on Y₂O₃ and Nb₂O₅ bases, respectively.
Claim 3
Dependent Claim
32 words
A semiconductive ceramic composition as defined in Claim 1 further comprising Mn, said Mn being present in an amount of 0.02 to 0.2 mol% on a MnO base based on said composition.
Claim 4
Dependent Claim
28 words
A semiconductive ceramic composition as defined in Claim 2 further comprising SiO₂, said SiO₂ being present in an amount of 0.01 to 0.1 mol% based on said composition.
Claim 5
Dependent Claim
31 words
A semiconductive ceramic composition as defined any one of Claims 1 to 3, wherein said composition is compacted and sintered to cause Bi to be present at a grain boundary thereof.
Claim 6
Dependent Claim
112 words
A semiconductive ceramic composition comprising: a base component comprising SrTiO₃; and a minor component comprising CaTiO₃, BaTiO₃, Y and Nb; said SrTiO₃ comprising SrO and TiO₂ in a molar ratio of 0.970 to 1.000 : 1.000; said CaTiO₃ being present in amounts respectively corresponding to 0.1 to 20.0, 1.0 to 20.0, 5.0 to 20.0 and 10.0 to 20.0 mol% in relation to 1.000, 0.990, 0.980 and 0.970 mol which are representative amounts of said SrO; said BaTiO₃ being present in an amount of 0.05 to 3.0 mol% and said Y and Nb being present in amounts of 0.1 to 1.0 mol% and 0.1 to 0.4 mol% on Y₂O₃ and Nb₂O₅ bases, respectively.
Claim 7
Dependent Claim
112 words
A semiconductive ceramic composition comprising: a base component comprising SrTiO₃; and a minor component comprising CaTiO₃, BaTiO₃, Y and Nb; said SrTiO₃ comprising SrO and TiO₂ in a molar ratio of 0.970 to 1.000 : 1.000; said CaTiO₃ being present in amounts respectively corresponding to 0.1 to 20.0, 1.0 to 20.0, 5.0 to 20.0 and 10.0 to 20.0 mol% in relation to 1.000, 0.990, 0.980 and 0.970 mol which are representative amounts of said SrO; said BaTiO₃ being present in an amount of 0.05 to 3.0 mol% and said Y and Nb being present in amounts of 0.1 to 1.0 mol% and 0.1 to 0.4 mol% on Y₂O₃ and Nb₂O₅ bases, respectively.
Claim 8
Dependent Claim
51 words
A semiconductive ceramic composition as defined in Claim 5 further comprising Mn and SiO₂, said Mn being present in an amount of 0.02 to 0.20 mol% on a MnO base based on said composition and said SiO₂ being present in an amount of 0.01 to 0.6 mol% based on said composition.
Claim 9
Dependent Claim
28 words
A semiconductive ceramic composition as defined Claim 5 or 6, wherein said composition is compacted and sintered to cause Bi to be present at a grain boundary thereof.
References Cited (Backward Citations)
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