US5128316A
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Articles containing a cubic perovskite crystal structure
Assignee: Eastman Kodak Co
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Filing: 1990-06-04
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Granted: 1992-07-07
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Expires: 2010-06-04
Abstract
Abstract A cubic perovskite crystal structure is disclosed satisfying the unit cell formula: R.sub.0.33+z A.sub.0.67 C.sub.1-y O.sub.3-x where R, A and C represent rare earth, alkaline earth and copper atoms, respectively, capable of forming a superconductive R 1 A 2 C 3 orthorhombic perovskite crystal structure; x is 0.67 to 1.0; y is up to 0.2; and z is up to 0.1. The crystal structure can be used to form superconductive superlattices and weak links for Josephson junction devices. The crystal structure can be produced by laser ablation deposition at a temperature below that required for the formation of a superconductive R 1 A 2 C 3 orthorhombic perovskite crystal structure. The crystal structure can be used as a substrate for the subsequent deposition of an R 1 A 2 C 3 orthorhombic perovskite crystal structure.
Inventors
- 👤 John A. Agostinelli
- 👤 Samuel Chen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:49
CPC Classifications
H; H10; H10N; H10N60/00; H10N60/10; H10N60/12; H10N60/124; C; C04; C04B; C04B35/00; C04B35/01; C04B35/45; C04B35/4504; C23; C23C; C23C14/00; C23C14/06; C23C14/08; C23C14/087; C30; C30B; C30B23/00; C30B23/02; C30B29/00; C30B29/10; C30B29/16; C30B29/22; C30B29/225; H10N60/80; H10N60/85; H10N60/855; H10N60/857; H10N60/858; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10S428/922; Y10S428/9265; Y10S428/93; Y10S505/00; Y10S505/70; Y10S505/701; Y10S505/702; Y10S505/703; Y10S505/704; Y10S505/775; Y10S505/776; Y10S505/779
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
104 words
An article comprised of a monocrystalline substrate capable of supporting the epitaxial deposition of a superconductive R 1 A 2 C 3 orthorhombic perovskite crystal phase and a layer comprised of a cubic perovskite crystal structure satisfying the unit cell formula: R.sub.0.33+z A.sub.0.67 C.sub.1-y O.sub.3-x wherein A is at least 50 percent barium on an atomic basis with any additional alkaline earths being chosen from the group consisting of strontium and calcium. C is copper, R is ytterium or a lanthanide other than cerium, praseodymium, promethium and terbium, x is 0.67 to 1; y is up to 0.2; and z is up to 0.1.
Claim 2
Dependent Claim
104 words
An article comprised of a monocrystalline substrate capable of supporting the epitaxial deposition of a superconductive R 1 A 2 C 3 orthorhombic perovskite crystal phase and a layer comprised of a cubic perovskite crystal structure satisfying the unit cell formula: R.sub.0.33+z A.sub.0.67 C.sub.1-y O.sub.3-x wherein A is at least 50 percent barium on an atomic basis with any additional alkaline earths being chosen from the group consisting of strontium and calcium. C is copper, R is ytterium or a lanthanide other than cerium, praseodymium, promethium and terbium, x is 0.67 to 1; y is up to 0.2; and z is up to 0.1.
Claim 3
Dependent Claim
12 words
An article according to claim 1 wherein R consists essentially of yttrium.
Claim 4
Dependent Claim
12 words
An article according to claim 1 wherein z is up to 0.08.
Claim 5
Dependent Claim
18 words
An article according to claim 1 wherein A is at least 80 percent barium on an atomic basis.
Claim 6
Dependent Claim
13 words
An article according to claim 4 wherein any additional alkaline earth is strontium.
Claim 7
Dependent Claim
13 words
An article according to claim 1 wherein y is from 0.05 to 0.18.
Claim 8
Dependent Claim
13 words
An article according to claim 1 wherein x is from 0.67 to 0.85.
Claim 9
Dependent Claim
39 words
An article according to claim 1 in which the cubic perovskite crystal structure satisfies the unit cell formula: Y.sub.0.33+z Ba.sub.0.67 Cu.sub.1-y O.sub.3-x where x represents 0.67 to 0.85; y represents 0.05 to 0.18; and z is up to 0.08.
Claim 10
Dependent Claim
84 words
An article according to claim 1 in which a layer comprised of an R 1 A 2 C 3 orthorhombic perovskite crystal phase overlies said cubic perovskite crystal structure containing layer, where in the R 1 A 2 C 3 phase A is at least 50 percent barium on an atomic basis with any additional alkaline earths being chosen from the group consisting of strontium and calcium, C is copper, and R is ytterium or a lanthanide other than cerium, praseodymium, promethium and terbium.
Claim 11
Dependent Claim
13 words
An article according to claim 9 in which said overlying layer is superconductive.
Claim 12
Dependent Claim
90 words
An article according to claim 1 in which a first layer comprised of an R 1 A 2 C 3 orthorhombic perovskite crystal phase is interposed between said substrate and said cubic perovskite crystal structure containing layer, where in the R 1 A 2 C 3 phase A is at least 50 percent barium on an atomic basis with any additional alkaline earths being chosen from the group consisting of strontium and calcium, C is copper, and R is ytterium or a lanthanide other than cerium, praseodymium, promethium and terbium.
Claim 13
Dependent Claim
20 words
An article according to claim 11 in which said first layer is superconductive R 1 A 2 C 3 .
Claim 14
Dependent Claim
89 words
An article according to claim 11 in which a second layer comprised of an R 1 A 2 C 3 orthorhombic perovskite crystal phase overlies said cubic perovskite crystal structure containing layer, where in the R 1 A 2 C 3 phase in the second layer A is at least 50 percent barium on an atomic basis with any additional alkaline earths being chosen from the group consisting of strontium and calcium, C is copper, and R is ytterium or a lanthanide other than cerium, praseodymium, promethium and terbium.
Claim 15
Dependent Claim
13 words
An article according to claim 13 in which said second layer is superconductive.
Claim 16
Dependent Claim
16 words
An article according to claim 1 in which the substrate is magnesia, alumina or a perovskite.
Claim 17
Dependent Claim
27 words
An article according to claim 15 in which the perovskite is chosen from the group consisting of strontium titanate, lanthanum aluminate, lanthanum: gallium oxide and potassium tantalate.
References Cited (Backward Citations)
US4880770A
Cited
US4908346A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1995-07-07 | 1996-01-06 | 1996-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-07-07 | 2000-01-06 | 2000-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-07-07 | 2004-01-06 | 2004-07-07 | $7700.00 | Window Closed / Lapsed |