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US4054532A
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Ceramic dielectric material
Assignee: Siemens AG
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Filing: 1976-01-23
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Granted: 1977-10-18
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Expires: 1996-01-23
Abstract
Abstract A ceramic compound having the formula (LaxA+21-x)2(TixB+51-x)2 O7 wherein A+2 is a positive divalent element selected from the group consisting of Ba, Ca, Cd, Mg, Sr and mixtures thereof and B+5 is a positive pentavalent element selected from the group consisting of Sb, Mo, Nb, Ta, W and mixtures thereof and x is a numeral ranging from 0.70 to 0.99. This compound is characterized by a relatively small temperature coefficient of permittivity, a relatively high insulation resistance, a relatively low loss factor and is compatible with relatively low cost noble metals, making it useful for forming dielectric elements in monolithic multi-layer capacitor elements.
Inventors
- 👤 Leopold Hanke
- 👤 Guenther Hoffmann
- 👤 Helmut Schmelz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:50
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; H; H01; H01B; H01B3/00; H01B3/02; H01B3/12; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
79 words
A ceramic dielectric material having a relatively low temperature coefficient of permittivity and consisting of a compound defined by the formula: (La.sub.x A.sup.+2.sub.1-x).sub.2 (Ti.sub.x B.sup.+5.sub.1-x).sub.2 O.sub.7 wherein A +2 is a positive divalent element selected from the group consisting of Ba, Ca, Cd, Mg, Sr and mixtures thereof; B +5 is a positive pentavalent element selected from the group consisting of Sb, Mo, Nb, Ta, W and mixtures thereof; and x is a numeral ranging from 0.70 to 0.99.
Claim 2
Dependent Claim
79 words
A ceramic dielectric material having a relatively low temperature coefficient of permittivity and consisting of a compound defined by the formula: (La.sub.x A.sup.+2.sub.1-x).sub.2 (Ti.sub.x B.sup.+5.sub.1-x).sub.2 O.sub.7 wherein A +2 is a positive divalent element selected from the group consisting of Ba, Ca, Cd, Mg, Sr and mixtures thereof; B +5 is a positive pentavalent element selected from the group consisting of Sb, Mo, Nb, Ta, W and mixtures thereof; and x is a numeral ranging from 0.70 to 0.99.
Claim 3
Dependent Claim
28 words
A ceramic dielectric material as defined in claim 1 wherein up to about 30 atomic percent of lanthanum in said compound is replaced by a rare earth element.
Claim 4
Dependent Claim
16 words
A ceramic dielectric material as defined in claim 2 wherein said rare earth element is neodymium.
Claim 5
Dependent Claim
62 words
A ceramic dielectric material as defined in claim 3 wherein said compound comprises: (La.sub.x.sbsb.1 Nd.sub.x.sbsb.2 Ba.sub.y).sub.2 (Ti.sub.x.sbsb.1.sub.+x.sbsb.2 Nb.sub.y).sub.2 O.sub.7 wherein x 1 is a numeral ranging from 0.75 to 0.92; x 2 is a numeral ranging from 0.03 to 0.2; and y is a numeral equal to the sum of x 1 and x 2 subtracted from one but greater than zero.
Claim 6
Dependent Claim
23 words
A ceramic dielectric material as defined in claim 1 which includes an excess of up to about 6 atomic percent of titanium dioxide.
Claim 7
Dependent Claim
28 words
A ceramic dielectric material as defined in claim 5 wherein up to about 30 atomic percent of lanthanum in said compound is replaced by a rare earth element.
Claim 8
Dependent Claim
16 words
A ceramic dielectric material as defined in claim 6 wherein said rare earth element is neodymium.
Claim 9
Dependent Claim
73 words
A ceramic dielectric material as defined in claim 5 wherein said compound comprises: (La.sub.x Ba.sub.y.sbsb.1 Ca.sub.y.sbsb.2).sub.2 (Ti.sub.x Nb.sub.y.sbsb.1.sub.+y.sbsb.2).sub.2 O.sub.7 wherein x is a numeral ranging from 0.92 to 0.94; and y 1 and y 2 are numerals ranging from 0.02 to 0.06 so that the sum of y 1 and y 2 is equal to 1 - x; said compound including an excess of up to about 5 atomic percent of titanium dioxide.
Claim 10
Dependent Claim
73 words
A ceramic dielectric material as defined in claim 5 wherein said compound comprises: (La.sub.x Ba.sub.y.sbsb.1 Mg.sub.y.sbsb.2).sub.2 (Ti.sub.x Nb.sub.y.sbsb.1.sub.+y.sbsb.2).sub.2 O.sub.7 wherein x is a numeral ranging from 0.85 to 0.94; and y 1 and y 2 are numerals ranging from 0.01 to 0.10 so that the sum of y 1 and y 2 is equal to 1 - x; said compound including an excess of up to about 5 atomic percent of titanium dioxide.
Claim 11
Dependent Claim
73 words
A ceramic dielectric material as defined in claim 5 wherein said compound comprises: (La.sub.x Mg.sub.y.sbsb.1 Ca.sub.y.sbsb.2).sub.2 (Ti.sub.x Nb.sub.y.sbsb.1.sub.+y.sbsb.2).sub.2 O.sub.7 wherein x is a numeral ranging from 0.92 to 0.94; and y 1 and y 2 are numerals ranging from 0.03 to 0.04 so that the sum of y 1 and y 2 is equal to 1 - x; said compound including an excess of up to about 5 atomic percent of titanium dioxide.
Claim 12
Dependent Claim
80 words
A ceramic dielectric material as defined in claim 5 wherein said compound comprises: (La.sub.x Mg.sub.y.sbsb.1 Ba.sub.y.sbsb.2 Ca.sub.y.sbsb.3).sub.2 (Ti.sub.x Nb.sub.y.sbsb.1.sub.+y.sbsb.2.sub.+y.sbsb.3).sub.2 O.sub.7 wherein x is a numeral ranging from 0.89 to 0.94; and y 1 , y 2 and y 3 are numerals ranging from 0.01 to 0.08 so that the sum of y 1 and y 2 and y 3 is equal to one minus x; said compound including an excess of up to about 5 atomic percent of titanium dioxide.
Claim 13
Dependent Claim
31 words
A ceramic dielectric material as defined in claim 5 wherein said compound comprises: (La.sub.0.94 Ba.sub.0.06).sub.2 (Ti.sub.0.94 W.sub.0.06).sub.2 O.sub.7 said compound including an excess of about 4 atomic percent of titanium dioxide.
Claim 14
Dependent Claim
31 words
A ceramic dielectric material as defined in claim 5 wherein said compound comprises: (La.sub.0.94 Ba.sub.0.06).sub.2 (Ti.sub.0.94 Mo.sub.0.06).sub.2 O.sub.7 said compound including an excess of about 4 atomic percent of titanium dioxide.
Claim 15
Dependent Claim
31 words
A ceramic dielectric material as defined in claim 5 wherein said compound comprises: (La.sub.0.94 Ba.sub.0.06).sub.2 (Ti.sub.0.94 Sb.sub.0.06).sub.2 O.sub.7 said compound including an excess of about 4 atomic percent of titanium dioxide.
Claim 16
Dependent Claim
34 words
A ceramic dielectric material as defined in claim 5 wherein said compound comprises: (La.sub.0.93 Cd.sub.0.06 Mg.sub.0.01).sub.2 (Ti.sub.0.93 Nb.sub.0.07).sub.2 O.sub.7 said compound including an excess of up to about 5 atomic percent of titanium dioxide.
Claim 17
Dependent Claim
28 words
A ceramic dielectric material as defined in claim 1 wherein said compound comprises: (La.sub.x Mg.sub.1-x).sub.2 (Ti.sub.x Nb.sub.1-x).sub.2 O.sub.7 wherein x is a numeral ranging from 0.90 to 0.97.
Claim 18
Dependent Claim
23 words
A ceramic dielectric material as defined in claim 16 and including an excess of up to about 5 atomic percent of titanium dioxide.
Claim 19
Dependent Claim
28 words
A ceramic dielectric material as defined in claim 1 wherein said compound comprises: (La.sub.x Mg.sub.1-x).sub.2 (Ti.sub.x Ta.sub.1-x).sub.2 O.sub.7 wherein x is a numeral ranging from 0.94 to 0.97.
Claim 20
Dependent Claim
21 words
A ceramic dielectric material as defined in claim 18 and including an excess of about 6 atomic percent of titanium dioxide.
Claim 21
Dependent Claim
28 words
A ceramic dielectric material as defined in claim 1 wherein said compound comprises: (La.sub.x Ba.sub.1-x).sub.2 (Ti.sub.x Nb.sub.1-x).sub.2 O.sub.7 wherein x is a numeral ranging from 0.85 to 0.97.
Claim 22
Dependent Claim
23 words
A ceramic dielectric material as defined in claim 20 and including an excess of about 0.5 to 5 atomic percent of titanium dioxide.
Claim 23
Dependent Claim
97 words
A process for producing a ceramic dielectric material as defined in claim 1 wherein starting materials for said compound comprise lanthanum oxide or lanthanum carbonate, rare earth oxides, titanium dioxide and niobates, tantalates, antimonates, molybdenates and tungstenates of magnesium, barium, calcium, strontium and cadmium respectively, and comprises: mixing select amounts of said starting materials to form a substantially uniform mixture; calcinating said uniform mixture at about 1000° to 1100° C.; grinding the calcinated mixture and forming a desired body shape therefrom; and sintering said formed body shapes in an oxidizing atmosphere at about 1200° to 1350° C.
Claim 24
Dependent Claim
18 words
A dielectric element in an electrical capacitor composed of a ceramic dielectric material as defined in claim 1.
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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) | 1980-10-17 | 1981-04-18 | 1981-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-17 | 1985-04-18 | 1985-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-17 | 1989-04-18 | 1989-10-18 | $7700.00 | Window Closed / Lapsed |