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EP0305300A2
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A method for producing a superconducting article
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1988-08-29
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Granted: —
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Expires: 2008-08-29
Abstract
Abstract An alloy consisting of metal elements, such as Y, Ba and Cu which are constituent elements of a superconducting compound oxide to be produced is oxidized so that a surface of the alloy is converted to the superconducting compound oxide such as YBa2Cu3O7- delta .
Inventors
- 👤 Takeshi C/O Itami Works Of Sumitomo Yamaguchi
- 👤 Hideo C/O Itami Works Of Sumitomo Itozaki
- 👤 Shuji C/O Itami Works Of Sumitomo Yazu
- 👤 Tetsuji C/O Itami Works Of Sumitomo Jodai
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 07:09
CPC Classifications
H; H10; H10N; H10N60/00; H10N60/01; H10N60/0268; C; C04; C04B; C04B35/00; C04B35/01; C04B35/45; C04B35/4504; C04B35/4512; C04B35/4521; C04B35/622; C04B35/64; C04B35/65; H10N60/80; H10N60/85; H10N60/855; H10N60/857; Y; Y10; Y10S; Y10S505/00; Y10S505/70; Y10S505/704; Y10S505/725; Y10S505/736
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
60 words
A method for producing a superconducting article, characterized by the steps comprising preparing an alloy consisting of metal elements which are constituent elements of a compound oxide to be produced, and then oxidizing a surface of the alloy so that the surface of the alloy is converted to said compound oxide of the metal elements which have a superconducting property.
Claim 2
Independent Claim
60 words
A method for producing a superconducting article, characterized by the steps comprising preparing an alloy consisting of metal elements which are constituent elements of a compound oxide to be produced, and then oxidizing a surface of the alloy so that the surface of the alloy is converted to said compound oxide of the metal elements which have a superconducting property.
Claim 3
Dependent Claim
28 words
A method set forth in Claim 1, characterized in that the surface of the alloy is heated in an oxidative atmosphere to effect the oxidation of the surface.
Claim 4
Dependent Claim
33 words
A method set forth in Claim 2, characterized in that the oxidation of the surface of the alloy is effected by means of irradiation of a laser beam in the presence of oxygen.
Claim 5
Dependent Claim
32 words
A method set forth in Claim 2, characterized in that the oxidation of the surface of the alloy is effected by means of irradiation of high-frequency wave in the presence of oxygen.
Claim 6
Dependent Claim
33 words
A method set forth in Claim 2, characterized in that the oxidation of the surface of the alloy is effected by means of irradiation of oxygen ion beam bombard in a vacuum chamber.
Claim 7
Dependent Claim
25 words
A method set forth in Claim 2, characterized in that the oxidation of the surface of the alloy is effected by means of oxidizing flame.
Claim 8
Dependent Claim
29 words
A method set forth in any one of Claim 1 to 6, characterized in that the superconducting article has a form of an elongated shape such as a wire.
Claim 9
Dependent Claim
66 words
A method set forth in any one of Claim 1 to 7, characterized in that the alloy consist of metal elements comprising an element α selected from IIa group of the Periodic Table, at least one element β selected from IIIa group of the Periodic Table, and an element γ selected from a group comprising Ib, IIb, IIIb, IVa and VIIIa groups of the Periodic Table.
Claim 10
Dependent Claim
83 words
A method set forth in Claim 8, characterized in that the converted compound oxide of the metal elements which is formed on the surface of the alloy is a compound oxide represented by the general formula: α w β x γ y O z in which α, β and γ have the same meaning as above and w, x, y and z satisfy the ranges of 1 ≦ w ≦ 5,1 ≦ x ≦ 5,1 ≦ y ≦ 15,1 ≦ z ≦ 20.
Claim 11
Dependent Claim
51 words
A method set forth in Claim 8 or 9, characterized in that the element α is Ba or Sr, the element β is at least one element selected from a group comprising Y, La, Gd, Dy, Ho, Er, Tm, Yb, Nd, Sm, Eu and Lu and the element γ is Cu.
Claim 14
Dependent Claim
24 words
A method set forth in Claim 10, characterized in that an atomic ratio of α : β : γ is 2 : 1: 3.
Claim 15
Dependent Claim
76 words
A method set forth in Claim 11, characterized in that the converted compound oxide of the metal elements which is formed on the surface of the alloy is a compound oxide represented by the general formula: Ln₁Ba₂Cu₃O 7-δ in which Ln stands for at least one element selected from a group comprising Y, La, Gd, Dy, Ho, Er, Tm, Yb, Nd, Sm, Eu and Lu and δ satisfies a range of 0 < δ < 1.
Claim 16
Dependent Claim
57 words
A method set forth in Claim 11, characterized in that the converted compound oxide of the metal elements which is formed on the surface of the alloy is a compound oxide represented by the general formula: (M,Sr)₂CuO 4-δ in which M stands for Y or La and δ satisfies a range of 0 < δ < 1.
Claim 17
Dependent Claim
117 words
A process set forth in Claim 11, characterized in that the converted compound oxide of the metal elements which is formed on the surface of the alloy is a compound oxide represented by the general formula: (α 1-x β x )Cu y O z in which α and β mean the same definition as above, x is an atomic ratio of β with respect to (α+β) and has 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 satisfies ranges of 0.4 ≦ y ≦ 3.0 and 1 ≦ z ≦ 5 respectively.
Claim 18
Dependent Claim
24 words
A method set forth in any one of Claim 1 to 7, characterized in that the alloy consist of Bi, Sr, Ca and Cu.
Claim 19
Dependent Claim
30 words
A method set forth in Claim 16, characterized in that the an atomic ratio of Bi : Sr : Ca : Cu is 2 : 2 : 2 : 3.
Claim 20
Dependent Claim
24 words
A method set forth in any one of Claim 1 to 7, characterized in that the alloy consist of Tl, Ba, Ca and Cu.
Claim 21
Dependent Claim
30 words
A method set forth in Claim 18, characterized in that the an atomic ratio of Tl : Ba : Ca : Cu is 2 : 2 : 2 : 3.
Claim 22
Dependent Claim
129 words
A method set forth in any one of Claim 16 to 19, characterized in that the converted compound oxide of the metal elements which is formed on the surface of the alloy is a compound oxide represented by the general formula: Θ₄(φ 1-q ,Ca q ) m Cu n O p+r in which Θ stands for Bi or Tl, φ stands for Sr when Θ is Bi and stands for Ba when Θ is Tl, m and n are numbers each satisfying a range of 6 ≦ m ≦ 10 and 4 ≦ n ≦ 8 respectively, p = (6+m+n), 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.
References Cited (Backward Citations)
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