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US4158219A
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Heterophasic ceramic capacitor
Assignee: University of Illinois Foundation
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Filing: 1977-11-01
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Granted: 1979-06-12
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Expires: 1997-11-01
Abstract
Abstract Liquid phase sintering of a mixture comprising a major amount of BaTiO3 and a minor amount of Pb5Ge3O11 at a temperature of 750 DEG -1050 DEG C. provides a heterophasic ceramic body of high dielectric constant and strength, and low dissipation factor. Consequently, relatively inexpensive low melting point metals such as silver and copper can be utilized as electrodes in the fabrication of monolithic multi-layer ceramic capacitors.
Inventors
- 👤 David A. Payne
- 👤 Sang M. Park
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:21
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H01G4/129; H01G4/1209; H01G4/1218; H01G4/1227; Y; Y10; Y10T; Y10T29/00; Y10T29/43; Y10T29/435
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
88 words
A high dielectric constant ceramic capacitor comprising a heterophasic dielectric ceramic body and electrode metal, said heterophasic ceramic body consisting essentially of a major amount of BaTiO 3 and from 1-33 volume percent of Pb 5 Ge 3 O 11 , which mixture matures by liquid phase sintering at a temperature within the range of about 750°-1050° C. and consolidates to yield said heterophasic structure in which a continuous intergranular Pb 5 Ge 3 O 11 derived phase separates the major BaTiO 3 phase into discrete localized volumes.
Claim 2
Dependent Claim
88 words
A high dielectric constant ceramic capacitor comprising a heterophasic dielectric ceramic body and electrode metal, said heterophasic ceramic body consisting essentially of a major amount of BaTiO 3 and from 1-33 volume percent of Pb 5 Ge 3 O 11 , which mixture matures by liquid phase sintering at a temperature within the range of about 750°-1050° C. and consolidates to yield said heterophasic structure in which a continuous intergranular Pb 5 Ge 3 O 11 derived phase separates the major BaTiO 3 phase into discrete localized volumes.
Claim 3
Dependent Claim
43 words
A monolithic ceramic capacitor in accordance with claim 1 which includes a plurality of layers of said heterophasic ceramic body with said electrode metal deposited thereon, alternate electrode layers being offset from one another to extend to opposite edges of the monolithic capacitor.
Claim 4
Dependent Claim
37 words
The ceramic capacitor of claim 2 wherein the BaTiO 3 has a particle size within the range of about 1-10μ and the Pb 5 Ge 3 O 11 is present in amount of about 5-25 volume %.
Claim 5
Dependent Claim
17 words
The ceramic capacitor of claim 2 wherein the electrode metal is a non-noble metal or alloy thereof.
Claim 6
Dependent Claim
24 words
The ceramic capacitor of claim 4 wherein the non-noble metal is selected from the group consisting of silver, copper, aluminum, iron, cobalt, and nickel.
Claim 7
Independent Claim
149 words
A method of fabricating a high dielectric, low dissipation factor, monolithic milti-layer ceramic capacitor, characterized by a heterophasic ceramic micro-structure, comprising the steps of: (a) forming a green ceramic body cosisting essentially of a major amount of BaTiO 3 and from 5-25 volume % of Pb 5 Ge 3 O 11 ; (b) applying metal electrodes to said green ceramic body; (c) stacking a plurality of said ceramic bodies and electrodes in a manner such that alternate electrode layers are offset from one another to extend to opposite edges of the monolithic capacitor; and (d) liquid phase sintering said plurality of ceramic bodies and electrodes at a temperature in the range of about 750°-1050° C. to consolidate said green ceramic body to yield said heterophasic structure in which a continuous intergranular Pb 5 Ge 3 O 11 derived phase separates the major BaTiO 3 phase into discrete localized volumes.
Claim 8
Independent Claim
149 words
A method of fabricating a high dielectric, low dissipation factor, monolithic milti-layer ceramic capacitor, characterized by a heterophasic ceramic micro-structure, comprising the steps of: (a) forming a green ceramic body cosisting essentially of a major amount of BaTiO 3 and from 5-25 volume % of Pb 5 Ge 3 O 11 ; (b) applying metal electrodes to said green ceramic body; (c) stacking a plurality of said ceramic bodies and electrodes in a manner such that alternate electrode layers are offset from one another to extend to opposite edges of the monolithic capacitor; and (d) liquid phase sintering said plurality of ceramic bodies and electrodes at a temperature in the range of about 750°-1050° C. to consolidate said green ceramic body to yield said heterophasic structure in which a continuous intergranular Pb 5 Ge 3 O 11 derived phase separates the major BaTiO 3 phase into discrete localized volumes.
Claim 9
Dependent Claim
36 words
The method of claim 6 wherein the BaTiO 3 has a partice size within the range of about 1-10μ and the Pb 5 Ge 3 O 11 is present in amount of about 5-25 volume %.
Claim 10
Dependent Claim
16 words
The method of claim 6 wherein the electrode metal is a non-noble metal or alloy thereof.
Claim 11
Dependent Claim
23 words
The method of claim 8 wherein the non-noble metal is selected from the group consisting of silver, copper, aluminum, iron, cobalt, and nickel.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-06-11 | 1982-12-11 | 1983-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-06-11 | 1986-12-11 | 1987-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-06-11 | 1990-12-11 | 1991-06-12 | $7700.00 | Window Closed / Lapsed |