US4244830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing a dielectric with perowskite structure and containing a copper oxide
Assignee: US Philips Corp
•
Filing: 1979-03-28
•
Granted: 1981-01-13
•
Expires: 1999-03-28
Abstract
Abstract Adding compounds which form in the temperature range of 1000° to 1250° C. the eutectics CuO.Cu 2 O or CuO.Cu 2 O Me IV O 2 to materials having a perowskite structure results in a reduction of the sintering temperature of the perowskite ceramic to between 1050° and 1185° C. For the perowskite ceramic the relevant materials are alkaline earth titanates, -zirconates, -stannates and mixed crystals thereof; Me IV O 2 represents the oxides of the elements of group IV of the periodic system of elements.
Inventors
- 👤 Detlev Hennings
- 👤 Herbert Schreinemacher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:10
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/48; C04B35/49; C04B35/46; C04B35/462; C04B35/465; C04B35/468; C04B35/4682; H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H01G4/1209
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
138 words
A method of producing a dielectric material comprising perowskite-forming compounds consisting essentially of one or more of the group of stoichiometrical alkaline earth titanates, alkaline earth zirconates, alkaline earth stannates and mixed crystals thereof, said method comprising the steps of: admixing, with said perowskite-forming compounds, a quantity of eutectic-forming compounds which cannot be incorporated into the perowskite lattice to any substantial extent and which are capable of forming CuO.Cu 2 O or CuO.Cu 2 O.Me IV O 2 when sintered in an oxygen atmosphere, where Me IV O 2 is at least one oxide of an element from group IV of the periodic system of elements; and sintering said admixture, at a partial oxygen pressure of 0.2-1 bar, in the temperature range of 1000° C. to 1250° C.; said eutectic-forming compounds being present in sintering temperature lowering amounts.
Claim 2
Independent Claim
138 words
A method of producing a dielectric material comprising perowskite-forming compounds consisting essentially of one or more of the group of stoichiometrical alkaline earth titanates, alkaline earth zirconates, alkaline earth stannates and mixed crystals thereof, said method comprising the steps of: admixing, with said perowskite-forming compounds, a quantity of eutectic-forming compounds which cannot be incorporated into the perowskite lattice to any substantial extent and which are capable of forming CuO.Cu 2 O or CuO.Cu 2 O.Me IV O 2 when sintered in an oxygen atmosphere, where Me IV O 2 is at least one oxide of an element from group IV of the periodic system of elements; and sintering said admixture, at a partial oxygen pressure of 0.2-1 bar, in the temperature range of 1000° C. to 1250° C.; said eutectic-forming compounds being present in sintering temperature lowering amounts.
Claim 3
Dependent Claim
24 words
A method as claimed in claim 1, wherein the eutectic forming compounds are each added in a quantity of 0.5 to 3 mole %.
Claim 4
Dependent Claim
31 words
A method as claimed in claim 1, wherein the CuO.Cu 2 O-forming compounds and the Me IV O 2 -forming compounds are present in a molar ratio of 1:3 to 3:1.
Claim 5
Dependent Claim
30 words
A method as claimed in claim 1, wherein up to 50 mole % of the alkaline earth elements which are part of the perowskite phase can be replaced by lead.
Claim 6
Dependent Claim
33 words
A method as claimed in claim 1, further comprising the step of calcining the perowskite forming compounds, in the temperature range of 1100° C. to 1200° C., prior to the step of admixing.
Claim 7
Dependent Claim
87 words
A method as claimed in claim 5, wherein prior to the step of calcining, there is further provided the step of adding, to the perowskite forming compounds, at least a part of the copper to be added, up to 1 mole % as an oxide or as a water-soluble compound in the form of a water/ethanol solution, or at least part of the Me IV to be added in the form of at least one of the elements titanium, zirconium, tin, hafnium or lead as an oxide.
Claim 8
Dependent Claim
44 words
A method as claimed in claim 5, wherein after the step of calcining, there is further provided the step of adding copper and at least one of the elements silicon, titanium, germanium, zirconium, tin, hafnium or lead as an oxide to the perowskite-forming compounds.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-01-13 | 1984-07-14 | 1985-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-13 | 1988-07-14 | 1989-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-13 | 1992-07-14 | 1993-01-13 | $7700.00 | Window Closed / Lapsed |