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EP0605904A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Nonreducible dielectric ceramic composition

Assignee: Murata Manufacturing Co Ltd
•
Filing: 1993-12-30
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Granted: —
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Expires: 2013-12-30
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Abstract

Abstract A nonreducible dielectric ceramic composition consists essentially of: a primary component consisting essentially of 92.0 to 99.4 mol% of BaTiO₃, 0.3 to 4.0 mol% of at least one of rare earth element, expressed by the general formula: Re₂O₃, where Re is at least one rare earth element selected from the group consisting of Tb, Dy, Ho and Er, and 0.3 to 4.0 mol% of Co₂O₃; a secondary component consisting essentially of BaO, MnO, MgO, BaZrO₃, the content of the secondary component being, per 100 moles of the primary component, 0.2 to 4.0 moles for BaO, 0.2 to 3.0 moles for MnO, 0.5 to 5 moles for MgO, 0.5 to 4.0 moles for BaZrO₃; and a vitreous component of a BaO-SrO-Li₂O-SiO₂ system, the content of the vitreous component being 0.5 to 2.5 parts by weight per 100 parts by weight of the sum of the primary and secondary components.

Inventors

  • 👤 Toshiki Nishiyama
  • 👤 Yukio Hamaji

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-08 16:46
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H01G4/1209; H01G4/1218; H01G4/1227; C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/465; C04B35/468; C04B35/4682

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 148 words
A nonreducible dielectric ceramic composition consists essentially of: a primary component consisting essentially of 92.0 to 99.4 mol% of BaTiO₃, 0.3 to 4.0 mol% of at least one of rare earth element, expressed by the general formula: Re₂O₃, where Re is at least one rare earth element selected from the group consisting of Tb, Dy, Ho and Er, and 0.3 to 4.0 mol% of Co₂O₃; a secondary component consisting essentially of BaO, MnO, MgO, BaZrO₃, the content of the secondary component being, per 100 moles of the primary component, 0.2 to 4.0 moles for BaO, 0.2 to 3.0 moles for MnO, 0.5 to 5 moles for MgO, 0.5 to 4.0 moles for BaZrO₃; and a vitreous component of a BaO-SrO-Li₂O-SiO₂ system, the content of the vitreous component being 0.5 to 2.5 parts by weight per 100 parts by weight of the sum of the primary and secondary components.
Claim 2
Dependent Claim 25 words
The nonreducible dielectric ceramic composition according to claim 1 wherein the content of inevitable impurities in BaTiO₃ is not more than 0.04 % by weight.
Claim 3
Dependent Claim 18 words
The nonreducible dielectric ceramic composition according to claim 2 said inevitable impurities in BaTiO₃ are alkaline metal oxides.
Claim 4
Dependent Claim 44 words
The nonreducible dielectric ceramic composition according to claim 1 wherein said vitreous component has a composition consisting essentially of 5 to 20 mol% of BaO, 5 to 20 mol% of SrO, 2 to 45 mol% of Li₂O and 30 to 70 mol% of SiO₂.

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