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EP0283620A1
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Superconducting ceramics
Assignee: Semiconductor Energy Laboratory Co Ltd
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Filing: 1987-10-14
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Granted: —
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Expires: 2007-10-14
Abstract
Abstract Superconducting ceramics having relatively high critical temperatures are composed of rare earth metals, alkaline earth metals and copper. They have few defects and a limited polycrystalline interfacial area.
Inventors
- 👤 Shunpei Yamazaki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 21:36
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/45; C04B35/4504; H; H10; H10N; H10N60/00; H10N60/80; H10N60/85; H10N60/855; H10N60/857; Y; Y10; Y10S; Y10S505/00; Y10S505/775; Y10S505/776; Y10S505/779; Y10S505/78
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
73 words
A superconducting ceramic of the general formula (A 1-x B x ) y Cu z O w (i) in which 0.1≦ x <1 y = 2.0-4.0 z = 1.0-4.0 w = 4.0-10.0 A is one or more rare earth elements and B is more than one alkaline earth element when A is one rare earth element, and is one or more alkaline earth elements when A is more than one rare earth element.
Claim 2
Dependent Claim
73 words
A superconducting ceramic of the general formula (A 1-x B x ) y Cu z O w (i) in which 0.1≦ x <1 y = 2.0-4.0 z = 1.0-4.0 w = 4.0-10.0 A is one or more rare earth elements and B is more than one alkaline earth element when A is one rare earth element, and is one or more alkaline earth elements when A is more than one rare earth element.
Claim 3
Dependent Claim
19 words
A superconducting ceramic according to claim 1, in which y = 2.5-3.5 z = 1.5-3.5 and w = 6.0-8.0.
Claim 4
Dependent Claim
81 words
A superconducting ceramic according to claim 1 of the general formula A( 1-x B x ) y Cu z O w . (A 1-xʹ Bʹ xʹ ) yʹ Cu zʹ 0 wʹ (ii) in which 0.1≦ x <1 0.1≦ x ʹ<1 y = 2.0-4.0, y ʹ = 2.0-4.0, z = 1.0-4.0, z ʹ = 1.0-4.0, w = 4.0-10.0, w ʹ = 4.0-10.0, A is one or more rare earth elements and B and Bʹ are two or more alkaline earth elements.
Claim 5
Dependent Claim
31 words
A superconducting ceramic according to claim 3, in which y = 2.5-3.5 y ʹ = 2.5-3.5 z = 1.5-3.5 z ʹ = 1.5-3.5 w = 6.0-8.0 and w ʹ = 6.0-8.0.
Claim 6
Dependent Claim
18 words
A superconducting ceramic according to claim 3 or claim 4, in which A is one rare earth element.
Claim 7
Dependent Claim
12 words
A superconducting ceramic according to claim 5, having the stoichiometric formula YbBaSrCu₃O₆₋₈.
Claim 8
Dependent Claim
12 words
A superconducting ceramic according to claim 5, having the stoichiometric formula YBaCaCu₃O₆₋₈.
Claim 9
Dependent Claim
18 words
A superconducting ceramic according to claim 5, having the stoichiometric formula YbBa 0.7 Sr 0.6 Ca 0.6 Cu₃O₆₋₈.
Claim 10
Dependent Claim
20 words
A superconducting ceramic according to claim 3 or claim 4, in which A is more than one rare earth element.
Claim 11
Dependent Claim
16 words
A superconducting ceramic according to claim 9, having the stoichiometric formula Y 0.5 Yb 0.5 BaSrCu₃O₆₋₈.
Claim 12
Dependent Claim
16 words
A superconducting ceramic according to claim 9, having the stoichiometric formula Y 0.5 Yb 0.5 BaCaCu₃O₆₋₈.
Claim 13
Dependent Claim
59 words
A superconducting ceramic according to claim 1, of the general formula [ A 1-x (B 1-q Bʹ q ) x ] y Cu z O w (iii) in which 0.1≦ x <1 0< q <1 y = 2.0-4.0, z = 1.0-4.0, w = 4.0-10.0, A is a rare earth element and B and Bʹ are different alkaline earth elements.
Claim 14
Dependent Claim
19 words
A superconducting ceramic according to claim 12, in which y = 2.5-3.5 z = 1.5-3.5 and w = 6.0-8.0.
Claim 15
Dependent Claim
68 words
A superconducting ceramic according to claim 1, of the general formula [ (A 1-p Aʹ p ) 1-x (B 1-q Bʹ q ) x ] y Cu z O w (iv) in which 0.1≦ x <1 0< p <1 0< q <1 y = 2.0-4.0, z = 1.0-4.0, w = 4.0-10.0, A and Aʹ are different rare earth elements and B and Bʹ are different alkaline earth elements.
Claim 16
Dependent Claim
18 words
A superconducting ceramic according to claim 14, in which y = 2.5-3.5 z = 1.5-3.5 w = 6.0-8.0.
Claim 17
Dependent Claim
59 words
A superconducting ceramic according to claim 1, of the general formula [ (A 1-p Aʹ p ) 1-x B x ] y Cu z O w (v) in which 0.1≦ x <1 0< p <1 y = 2.0-4.0, z = 1.0-4.0, w = 4.0-10.0, A and Aʹ are different rare earth elements and B is an alkaline earth element.
Claim 18
Dependent Claim
18 words
A superconducting ceramic according to claim 16, in which y = 2.5-3.5 z = 1.5-3.5 w = 6.0-8.0.
Claim 19
Dependent Claim
16 words
A superconducting ceramic according to claim 17, having the stoichiometric formula Y 0.5 Gd 0.5 Ba₂Cu₃O₆₋₈.
Claim 20
Dependent Claim
16 words
A superconducting ceramic according to claim 17, having the stoichiometric formula Y 0.5 Yb 0.5 Ba₂Cu₃O₆₋₈.
Claim 21
Independent Claim
49 words
A method for producing a superconducting ceramic according to any one of claims 1 to 19, which comprises mixing together stoichiometric amounts of the oxides and/or carbides of the constituent metals, in powder form, compressing the mixture to a desired shape and sintering the mixture at an elevated temperature.
Claim 22
Dependent Claim
40 words
A superconducting ceramic comprising two or more rare earth elements and/or two or more alkaline earth elements and having a polycrystalline perovskite-like structure of large crystalline particles providing reduced interfacial areas between crystalline particles and correspondingly elevated superconducting onset temperature.
Claim 23
Dependent Claim
40 words
A superconducting ceramic comprising two or more rare earth elements and/or two or more alkaline earth elements and having a polycrystalline perovskite-like structure of large crystalline particles providing reduced interfacial areas between crystalline particles and correspondingly elevated superconducting onset temperature.
References Cited (Backward Citations)
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