US4900716A
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Process for producing a compound oxide type superconducting material
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1988-05-18
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Granted: 1990-02-13
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Expires: 2008-05-18
Abstract
Abstract The invention is an after-treatment of a compound oxide type superconducting material by oxygen plasma to improve the superconducting property of the material. The treatment by oxygen plasma is performed while the material is heated at 500° to 1,000° C. The material may have a form of bulky mass or a form of a thin film deposited on a substrate by physical vapor deposition technique.
Inventors
- 👤 Nobuhiko Fujita
- 👤 Hideo Itozaki
- 👤 Saburo Tanaka
- 👤 Shuji Yazu
- 👤 Tetsuji Jodai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:43
CPC Classifications
H; H10; H10N; H10N60/00; H10N60/01; H10N60/0268; H10N60/0661; Y; Y10; Y10S; Y10S505/00; Y10S505/725; Y10S505/742
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
44 words
Improvement in a process for producing a compound oxide type superconducting material, characterized in that the compound oxide type superconducting material is treated in oxygen plasma while the compound oxide type superconducting material is heated at a temperature ranging from 500° to 1000° C.
Claim 2
Dependent Claim
44 words
Improvement in a process for producing a compound oxide type superconducting material, characterized in that the compound oxide type superconducting material is treated in oxygen plasma while the compound oxide type superconducting material is heated at a temperature ranging from 500° to 1000° C.
Claim 3
Dependent Claim
28 words
Method set forth in claim 1, characterized in that, after the treatment by oxygen plasma is complete, the treated material is cooled down slowly in the oxygen plasma.
Claim 4
Dependent Claim
24 words
Method set forth in claim 1, characterized in that said treated material is cooled down at a cooling speed of less than 10° C./min.
Claim 5
Dependent Claim
27 words
Method set forth in claim 1, characterized in that said compound oxide type superconducting material is in a form of a thin film deposited on a substrate.
Claim 6
Dependent Claim
45 words
Method set forth in claim 1, characterized in that said compound oxide type superconducting material is a compound oxide containing an element α selected from IIa group of the periodic table, an element β selected from IIIb group of the periodic table and copper (Cu).
Claim 7
Dependent Claim
79 words
Method set forth in claim 5, characterized in that said compound oxide have the general formula: (α.sub.1-x β.sub.x)Cu.sub.y O.sub.z in which α and β means the same definition as above, x is an atomic ratio of β with respect to (α+β) having a range of 0.1≦x≦0.9, and y and z are respective atomic ratios with respect to (α 1-x β x ) which is considered to be equal to 1 and each satisfy ranges of 0.4≦y≦3.0 and 1≦z≦5 respectively.
Claim 8
Dependent Claim
59 words
Method set forth in claim 5, characterized in that said compound oxide have the general formula: Ln.sub.1-x Ba.sub.x Cu.sub.3 O.sub.7-δ in which Ln stands for at least one of elements selected from a group comprising Y, La, Gd, Dy, Ho, Er, Tm, Tb, Lu, Nd, Sm and Eu, and δ is a number which satisfies a range of 0<δ<1.
Claim 9
Dependent Claim
23 words
Method set forth in claim 5, characterized in that said compound oxide type superconducting material possesses perovskite type or quasi-perovskite type crystal structure.
Claim 10
Dependent Claim
50 words
Method set forth in claim 5, characterized in that said compound oxide type superconducting material is in a form of a bulky sintered mass prepared by sintering preliminarily a powder mixture of oxides and/or carbonates containing constituent elements of said superconductor at a temperature ranging from 220° to 1,260° C.
Claim 11
Dependent Claim
68 words
Method set forth in claim 9, characterized in that said compound oxide type superconducting material is in a form of a bulky sintered mass prepared by sintering preliminarily a powder mixture of oxides and/or carbonates containing constituent elements of said superconductor at a temperature ranging from 220° to 1,260° C. and then by sintering finally the preliminarily sintered mass at a temperature ranging from 650° to 1,580° C.
Claim 12
Dependent Claim
46 words
Method set forth in claim 5, characterized in that said compound oxide type superconducting material is in a form of a thin film which is deposited on a substrate by physical vapour deposition technique in which said preliminarily sintered mass is used as a vapour source.
Claim 13
Dependent Claim
46 words
Method set forth in claim 5, characterized in that said compound oxide type superconducting material is in a form of a thin film which is deposited on a substrate by physical vapour deposition technique in which said finally sintered mass is used as a vapour source.
Claim 14
Dependent Claim
76 words
Method set forth in claim 1, characterized in that said compound oxide have the general formula: Θ4(Φ.sub.1-q, Ca.sub.q).sub.m Cu.sub.n O.sub.p+r in which Θ is Bi or Tl, Θ is Sr when Θ is Bi and is Ba when Θ is Tl, m and n are numbers each satisfying ranges of 6≦m≦10 and 4≦n≦8 respectively, p=(12+2m+2n)/2, q is a number which satisfies a range of 0<q<1, and r is a number which satisfies a range of -2≦r≦+2.
Claim 15
Dependent Claim
160 words
Process for producing a compound oxide type superconducting material by selecting a compound oxide from a group consisting of (i) compound oxides containing an element α selected from IIa group of the periodic table, an element β selected from IIIb group of the periodic table and copper (Cu) and (ii) compound oxides have the general formula: Θ4(Φ.sub.1-q,Ca.sub.q).sub.m Cu.sub.n O.sub.p-r in which Θ is bi or Tl, Φ is Sr when Θ is Bi and is Ba when Θ is Tl, m and n are numbers each satisfying respective ranges of 6≦m≦10 and 4≦n≦8, p=(12+2m+2n)/2, q is a number which satisfies a range of 0<q<1 and r is a number which satisfies a range of -2≦r≦+2, and preparing the compound oxide type superconducting material which was selected in a form of a thin film or a bulk form and treated in oxygen plasma while the compound oxide type superconducting material is heated at a temperature ranging from 500° to 1000° C.
Claim 16
Dependent Claim
160 words
Process for producing a compound oxide type superconducting material by selecting a compound oxide from a group consisting of (i) compound oxides containing an element α selected from IIa group of the periodic table, an element β selected from IIIb group of the periodic table and copper (Cu) and (ii) compound oxides have the general formula: Θ4(Φ.sub.1-q,Ca.sub.q).sub.m Cu.sub.n O.sub.p-r in which Θ is bi or Tl, Φ is Sr when Θ is Bi and is Ba when Θ is Tl, m and n are numbers each satisfying respective ranges of 6≦m≦10 and 4≦n≦8, p=(12+2m+2n)/2, q is a number which satisfies a range of 0<q<1 and r is a number which satisfies a range of -2≦r≦+2, and preparing the compound oxide type superconducting material which was selected in a form of a thin film or a bulk form and treated in oxygen plasma while the compound oxide type superconducting material is heated at a temperature ranging from 500° to 1000° C.
References Cited (Backward Citations)
US3932315A
Cited
JPS60173885A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-12 | 1993-08-14 | 1994-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-12 | 1997-08-14 | 1998-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-12 | 2001-08-14 | 2002-02-13 | $7700.00 | Window Closed / Lapsed |