EP0205137A2
Expired / Lapsed
EP
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Dielectric compositions
Assignee: EIDP Inc
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Filing: 1986-06-07
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Granted: —
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Expires: 2006-06-07
Abstract
Abstract A composition for forming a densified dielectric body at low firing temperatures which is a mixture of finely divided particles of BaTiO 3 , a metal oxide selected from Nb 2 O 5 , Ta 2 O 5 and mixtures thereof, a rare earth oxide and a mixture of MnO 2 and another transition metal oxide.
Inventors
- 👤 Kyoichi Sasaki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 17:25
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: 11
Claim 1
Independent Claim
129 words
A composition for forming a densified dielectric body at low firing temperatures which is a mixture of finely divided particles consisting essentially of: (a) 99.2-99.95% wt. of an admixture of (1) 97.10-99.48 mole % BaTiO 3 having an average particle size of not more than 1.5 µm. (2) 2.00-0.52 mole % of a metal oxide selected from Nb 2 O 5 , Ta 2 0 5 and mixtures thereof, and (3) 0-0.90 mole % of an oxide of a rare earth having an atomic number of 57-62 or mixtures thereof, and (b) 0.8-0.05% wt. of a mixture of transition metal oxides having atomic numbers of 24-28 consisting essentially of 30-70 mole % Mn0 2 and 70-30 mole % of the oxide of at least one other such transition metal.
Claim 2
Dependent Claim
129 words
A composition for forming a densified dielectric body at low firing temperatures which is a mixture of finely divided particles consisting essentially of: (a) 99.2-99.95% wt. of an admixture of (1) 97.10-99.48 mole % BaTiO 3 having an average particle size of not more than 1.5 µm. (2) 2.00-0.52 mole % of a metal oxide selected from Nb 2 O 5 , Ta 2 0 5 and mixtures thereof, and (3) 0-0.90 mole % of an oxide of a rare earth having an atomic number of 57-62 or mixtures thereof, and (b) 0.8-0.05% wt. of a mixture of transition metal oxides having atomic numbers of 24-28 consisting essentially of 30-70 mole % Mn0 2 and 70-30 mole % of the oxide of at least one other such transition metal.
Claim 3
Dependent Claim
21 words
The composition of claim 1 which also contains 0.1-1.5% wt. of a fluxing agent, basis total weight of (a) and (b).
Claim 4
Dependent Claim
28 words
The composition of claim 2 in which the fluxing agent is selected from cadmium borate. lithium borate, cadmium borosilicate, bismuth oxide, lead borosilicate and mixtures and precursors thereof.
Claim 5
Dependent Claim
19 words
The composition of claim 1 in which the mixture of finely divided solids is dispersed in an organic medium.
Claim 6
Dependent Claim
20 words
The composition of claim 4 in which the organic medium is comprised of a polymeric binder dissolved in organic solvent.
Claim 7
Dependent Claim
21 words
The composition of claim 4 in which the organic solvent is a volatile solvent and the dispersion is a castable consistency.
Claim 8
Dependent Claim
21 words
A dielectric green tape comprising a layer of the composition of claim 7 from which the volatile solvent has been removed.
Claim 9
Dependent Claim
46 words
A capacitor comprising a plurality of layers of the green tape of claim 7 having a printed thick film electrode layer therebetween, the assemblage having been fired in air to effect volatilization of the organic materials, sintering of the inorganic particles and densification of the mixture.
Claim 10
Dependent Claim
43 words
A thick film composition comprising the composition of claim 4 in which the organic medium is a solution comprising a resin and thixotropic agent dissolved in a solvent having a boiling point of 130-150°C and the composition has rheological properties suitable for printing.
Claim 11
Dependent Claim
59 words
.A capacitor comprising a ceramic substrate on which is printed a plurality of printed layers of the composition of claim 9. each pair of printed dielectric layers having a printed thick film electrode layer therebetween, the assemblage having been fired in air to effect volatilization of the organic medium, sintering of the inorganic particles and densification of the mixtures.
References Cited (Backward Citations)
No citation records indexed.
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