US4260663A
Expired / Lapsed
US
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Method of producing a dielectric having a perowskite structure
Assignee: US Philips Corp
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Filing: 1979-06-04
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Granted: 1981-04-07
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Expires: 1999-06-04
Abstract
Abstract Only those dielectrics which have a correspondingly low sintering temperature are suitable for the production of ceramic multi-layer capacitors having intermediate electrodes consisting of non-noble metals, such as nickel and cobalt. Suitable are ceramic masses comprising alkaline earth zirconates, wherein up to 10 mole % of the zirconium may have been replaced by titanium; iron or nickel or manganese being added as doping agents to the stoichiometrical perowskite basic compound having a composition of alkaline earth metal (Zr 1-x Ti x )O 3 where O<x≦0.07 and the whole assembly being sintered in a reducing atmosphere.
Inventors
- 👤 Hans J. Hagemann
- 👤 Siegfried Hunten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:41
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H01G4/1209; H01G4/1236; H01G4/1245; C; C04; C04B; C04B35/00; C04B35/01; C04B35/48; C04B35/49; H01G4/005; H01G4/008; H01G4/0085
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
89 words
A method of producing a dielectric having a perowskite structure, starting from alkaline earth zirconates, wherein up to 10 mole % of the zirconium may have been replaced by titanium, characterized in that a metal of the iron group or manganese were added in the form of their carbonates or oxides as doping agent to the stoichiometrical perowskite basic compound having a composition of E(Zr 1-x Ti x )O 3 , where O<x≦0.07, and that the whole assembly is sintered in a reducing atmosphere to obtain a dense structure.
Claim 2
Independent Claim
89 words
A method of producing a dielectric having a perowskite structure, starting from alkaline earth zirconates, wherein up to 10 mole % of the zirconium may have been replaced by titanium, characterized in that a metal of the iron group or manganese were added in the form of their carbonates or oxides as doping agent to the stoichiometrical perowskite basic compound having a composition of E(Zr 1-x Ti x )O 3 , where O<x≦0.07, and that the whole assembly is sintered in a reducing atmosphere to obtain a dense structure.
Claim 3
Dependent Claim
36 words
A method as claimed in claim 1, characterized in that iron (Fe) or nickel (Ni) are used as the metals from the iron group as the admixture in a quantity of 0.2 to 1.2 mole %.
Claim 4
Dependent Claim
23 words
A method as claimed in claim 1, characterized in that manganese (Mn) is added in a quantity of 0.1 to 1.2 mole %.
Claim 5
Dependent Claim
39 words
A method as claimed in claim 3, characterized in that a perowskite basic compound of the composition CaZr 0 .985 Ti 0 .015 O 3 is doped with 0.2 to 1.2, preferably 0.5 to 1.0 mole % of manganese.
Claim 6
Dependent Claim
37 words
A method as claimed in claim 2, characterized in that a perowskite basic compound having the composition CaZr 0 .985 Ti 0 .015 O 3 is doped with 0.5 to 1.2, preferably 1.0, mole % of iron.
Claim 7
Dependent Claim
41 words
A method as claimed in claim 3, characterized in that a perowskite basic compound having the composition SrZr 0 .955 Ti 0 .045 O 3 is doped with 0.1 to 1.2 mole %, preferably 0.2 to 1.0 mole %, of manganese.
Claim 8
Dependent Claim
41 words
A method as claimed in claim 2, characterized in that a perowskite basic compound having the composition SrZr 0 .955 Ti 0 .045 O 3 is doped with 0.2 to 1.2 mole %, preferably 0.5 to 1.0 mole %, of iron.
Claim 9
Dependent Claim
39 words
A method as claimed in claim 2, characterized in that a perowskite basic compound having the composition SrZr 0 .955 Ti 0 .045 O 3 is doped with 0.2 to 1.0 mole %, preferably 0.5 mole %, of nickel.
Claim 10
Dependent Claim
66 words
A method as claimed in claim 1, characterized in that after mixing the compounds which form the perowskite phase with the compound of the metal to be added a calcining procedure is performed in the temperature range from 1100° to 1200° C., whereafter the product is milled, shaped and thereafter sintered at a temperature in the range from 1320° to 1450° C. in a reducing atmosphere.
Claim 11
Independent Claim
39 words
A method as claimed in any one of claims 1 to 9, characterized in that the preform to be sintered is provided prior to the sintering process with at least two layers of electrode-forming nickel (Ni) or cobalt (Co).
Claim 12
Dependent Claim
30 words
A multi-layer capacitor having a dielectric produced by means of the method claimed in any one of claims 1 to 10 and provided with nickel (Ni) or cobalt (Co) electrodes.
References Cited (Backward Citations)
US3153179A
Cited
US3811937A
Cited
US4030004A
Cited
US4054531A
Cited
US3987347A
Cited
US4048546A
Cited
US4063341A
Cited
US4056654A
Cited
US4089038A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-04-06 | 1984-10-06 | 1985-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-06 | 1988-10-06 | 1989-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-06 | 1992-10-06 | 1993-04-07 | $7700.00 | Window Closed / Lapsed |