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US4474894A
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Dielectric on the basis of lead titanates, method of manufacturing same, and a multilayer capacitor comprising the dielectric
Assignee: US Philips Corp
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Filing: 1983-02-22
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Granted: 1984-10-02
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Expires: 2003-02-22
Abstract
Abstract A dielectric having a sintering temperature in the range from 800° to 1000° C. on the basis of lead titanates, in which at least 50 mol % of the titanium are substituted by Mg and W, the stoichiometric basic compound having the following composition: Pb(Ti.sub.1-x-y Mg.sub.x W.sub.y)O.sub.3 wherein 0.25≦x≦0.35 and 0.25≦y≦0.35 and comprising an addition of 0.001 to 0.006 (5PbO+1WO 3 ) on an additive molar basis.
Inventors
- 👤 Karl H. Hardtl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:25
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/472; H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H01G4/1209; H01G4/1254; H01G4/1263
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
70 words
A lead titanate dielectric, the sintering temperature of which is below the melting-point of silver, and in which at least 50 mole % of the titanium is substituted by magnesium and tungsten, characterized in that the dielectric has a composition comprising the stoichiometric basic compound of the following formula: Pb(Ti.sub.1-x-y Mg.sub.x W.sub.y)O.sub.3, wherein 0.25≦x≦0.35 and 0.25≦y≦0.35 and in addition 0.001 to 0.006 (5PbO+1WO 3 ) on an additive molar basis.
Claim 2
Dependent Claim
70 words
A lead titanate dielectric, the sintering temperature of which is below the melting-point of silver, and in which at least 50 mole % of the titanium is substituted by magnesium and tungsten, characterized in that the dielectric has a composition comprising the stoichiometric basic compound of the following formula: Pb(Ti.sub.1-x-y Mg.sub.x W.sub.y)O.sub.3, wherein 0.25≦x≦0.35 and 0.25≦y≦0.35 and in addition 0.001 to 0.006 (5PbO+1WO 3 ) on an additive molar basis.
Claim 3
Dependent Claim
22 words
A dielectric as claimed in claim 1, characterized in that said dielectric has the following composition: Pb(Ti.sub.0.4 Mg.sub.0.3 W.sub.0.3)O.sub.3 ÷0.001 to 0.006(5PbO+1WO.sub.3).
Claim 4
Dependent Claim
20 words
A dielectric as claimed in claim 2, characterized in that said dielectric has the following composition Pb(Ti.sub.0.4 Mg.sub.0.3 W.sub.0.3)O.sub.3 +0.003(5PbO+1WO.sub.3).
Claim 5
Dependent Claim
35 words
A dielectric as claimed in claim 1, characterized in that said dielectric has the following composition: Pb(Ti.sub.1-(x+z)-y Mg.sub.x-z Me.sub.z W.sub.y)O.sub.3 +0.001 to 0.006(5PbO+1WO.sub.3), wherein 0.288≦x≦0.299 y=0.3 0.001≦z≦0.012 and Me is at least one transition metal.
Claim 6
Dependent Claim
21 words
A dielectric as claimed in claim 4, characterized in that said dielectric has the following composition: Pb(Ti.sub.0.4 Mg.sub.0.294 Me.sub.0.006 W.sub.0.3)O.sub.3 +0.003(5PbO+1WO.sub.3).
Claim 7
Dependent Claim
25 words
A dielectric as claimed in claim 4, characterized in that at least one of Cr, Mn, Fe or Co is used as the transition metal.
Claim 8
Dependent Claim
47 words
A dielectric as claimed in claim 4 or 6, characterized in that said dielectric has the following composition: Pb(Ti.sub.0.4 Mg.sub.0.3-z Me.sub.z W.sub.0.3)O.sub.3 +0.003(5PbO+1WO.sub.3) wherein z=0.003 to 0.009 and wherein Me is one or more of the metals of the group consisting of Mn, Cr, Co and Fe.
Claim 9
Dependent Claim
29 words
A dielectric as claimed in claim 4, characterized in that said dielectric has the following composition: Pb(Ti.sub.0.4 Mg.sub.0.294 Me.sub.0.006 W.sub.0.3)O.sub.3 +0.001 to 0.006(5PbO+1WO.sub.3): wherein Me=Cr, Mn, Fe and/or Co.
Claim 10
Dependent Claim
11 words
A multilayer capacitor having a dielectric as claimed in claim 1.
Claim 11
Dependent Claim
50 words
A dielectric as claimed in claim 6, characterized in that said dielectric has the following composition: Pb(Ti 0 .4 Mg 0 .3-z Me z W 0 .3)O 3 +0.003(5PbO+1WO 3 ) wherein z=0.003 to 0.009, and wherein Me is one or more of the metals Mn, Cr, Co and Fe.
Claim 12
Dependent Claim
78 words
A method of manufacturing a dielectric as claimed in claim 1, comprising the steps: (a) mixing and grinding the compounds forming the stoichiometric basic compound together with the additional amounts of the PbO and WO 3 ; (b) calcinating the resultant mixture at a temperature of from 700° to 750° C.; (c) grinding and shaping the resultant calcined mixture and (d) heating said shaped mixture at a temperature of 800°-1000° C. to thereby form a densely sintered product.
Claim 13
Dependent Claim
95 words
A method of manufacturing a dielectric as claimed in claim 1, comprising the steps: (a) mixing and grinding the compounds forming the stoichiometric basic compound; (b) calcinating the resultant mixture at a temperature of from 700° to 750° C.; (c) adding to, and mixing with, said calcined mixture the additional amounts of the PbO and WO 3 ; (d) grinding and shaping the resultant mixture into a product of a desired configuration and (e) heating the resultant shaped product at a temperature of from 800° to 1000° C. to thereby form a densely sintered product.
References Cited (Backward Citations)
US4048546A
Cited
US4063341A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-02 | 1988-04-02 | 1988-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-02 | 1992-04-02 | 1992-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-02 | 1996-04-02 | 1996-10-02 | $7700.00 | Window Closed / Lapsed |