US4964016A
Expired / Lapsed
US
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Multi-layer ceramic capacitors having, as the conductive elements therein, layers of perovskites containing oxygen and nitrogen
Assignee: Centre National de la Recherche Scientifique
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Filing: 1989-07-14
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Granted: 1990-10-16
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Expires: 2009-07-14
Abstract
Abstract The present invention relates to new conductive perovskites containing oxygen and nitrogen, their preparation and their use particularly as electrode material. The conductive perovskites containing oxygen and nitrogen according to the invention correspond to the general formula I AB(O,N)3 (I) in the cationic lattice of which: A denotes a metal chosen from the metals of groups IA and IIA, yttrium and the lanthanides, B denotes a metal chosen from the transition metals of groups IVA to IB, on the express condition that at least one of the metals A and B is present in an oxidation state other than its normal maximum oxidation state.
Inventors
- 👤 Roger Marchand
- 👤 Philippe Antoine
- 👤 Paul L'Haridon
- 👤 Yves Laurent
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:29
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/005; H01G4/008; C; C04; C04B; C04B35/00; C04B35/01; C04B35/495; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H01G4/1209; H01G4/1218; H01G4/1227; H01G4/1254; H01G4/30; Y; Y10; Y10T; Y10T29/00; Y10T29/43; Y10T29/435
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
97 words
A multi-layer ceramic capacitor comprising at least one dielectric element and conductive elements in which said conductive elements comprise conductive perovskites containing oxygen and nitrogen, corresponding to the general formula I AB(O,N).sub.3 (I) in the cationic lattice of which: A denotes a metal chosen from the metals of groups IA and IIA, yttrium and the lanthanides, B denotes a metal chosen from the transition metals of groups IVA to IB, on the express condition that at least one of the metals A and B is present in an oxidation state other than its normal maximum oxidation state.
Claim 2
Dependent Claim
97 words
A multi-layer ceramic capacitor comprising at least one dielectric element and conductive elements in which said conductive elements comprise conductive perovskites containing oxygen and nitrogen, corresponding to the general formula I AB(O,N).sub.3 (I) in the cationic lattice of which: A denotes a metal chosen from the metals of groups IA and IIA, yttrium and the lanthanides, B denotes a metal chosen from the transition metals of groups IVA to IB, on the express condition that at least one of the metals A and B is present in an oxidation state other than its normal maximum oxidation state.
Claim 3
Dependent Claim
27 words
A capacitor as claimed in claim 1, wherein at least one of the metals A and B in said perovskites is present in a mixed valency state.
Claim 4
Dependent Claim
22 words
A capacitor as claimed in claim 1 or 2, wherein at least part of the anionic site in said perovskites is vacant.
Claim 5
Dependent Claim
23 words
A capacitor as claimed in claim 1 or 2, which contain at least one cationic vacancy in the metal A in said perovskites.
Claim 6
Dependent Claim
33 words
A capacitor as claimed in claim 1 or 2, wherein the metal A in said perovskites is selected from the group consisting of Ca, Sr, Ba, La, Pr, Nd, Sm, Eu and Ce.
Claim 7
Dependent Claim
30 words
A capacitor as claimed in claim 1 or 2, wherein the metal B in said perovskites is selected from the group consisting of W, Mo, V, Nb, Ta and Ti.
Claim 8
Dependent Claim
72 words
A capacitor as claimed in claim 1 or 2, in which said perovskites are chosen from: Lav(III).sub.1-x V(IV).sub.x O.sub.3-x N.sub.x with <x≦1 CaW(VI).sub.1-x W(V).sub.x O.sub.1+x N.sub.2-1 with 0.4≦x≦0.6 SrW(VI).sub.1-x W(V).sub.x O.sub.1+x N.sub.2-x with 0.8≦x≦1 BaW(VI).sub.1-x W(V).sub.x O.sub.1+x N.sub.2-x with 0.8≦x≦1 SrMo(VI).sub.1-x Mo(V).sub.x O.sub.1+x N.sub.2-x with 0.8+≦x≦1 LaW(VI).sub.1-x W(V).sub.x O.sub.x N.sub.3-x with 0.6≦x≦0.8 PrW(VI).sub.1-x W(V).sub.x O.sub.x N.sub.3-x with 0.6≦x≦0.8 NdW(VI).sub.1-x W(V).sub.x O.sub.x N.sub.3-x with 0.6≦x≦0.8 Eu(III).sub.1-y Eu(II).sub.y W(VI).sub.1-x W(V).sub.x O.sub.x+y N.sub.3-(x+y) with 0.5≦x+y≦1.5.
Claim 9
Dependent Claim
56 words
Process for the preparation of a multilayer ceramic capacitor as claimed in claim 1 or 2, wherein a mixed oxide of metals A and B is subjected to a nitriding in a stream of ammonia at a temperature of between 700° C. and 900° C. and the perovskites thus obtained is cosintered with a dielectric material.
Claim 10
Dependent Claim
21 words
Process as claimed in claim 8, wherein the said oxide is selected from the group consisting of tungstates, molybdates and vanadates.
Claim 11
Dependent Claim
39 words
Process as claimed in claim 9, wherein said oxide is selected from the group consisting of CaWO 4 , SrWO 4 , BaWO 4 , LaW 2 O 9 , SrMoO 4 , LaVO 4 and LaVO 3 .
Claim 12
Dependent Claim
21 words
A capacitor as claimed in claim 1 or 2 in which said dielectric elements are also perovskites containing oxygen and nitrogen.
Claim 13
Dependent Claim
29 words
A capacitor as claimed in claim 11 which is prepared by cosintering conductive perovskites containing oxygen and nitrogen with dielectric perovskites containing oxygen and nitrogen in a nonoxidizing atmosphere.
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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) | 1993-10-15 | 1994-04-16 | 1994-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-15 | 1998-04-16 | 1998-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-15 | 2002-04-16 | 2002-10-16 | $7700.00 | Window Closed / Lapsed |