EP0368210A2
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An oxide superconductor composition and a process for the production thereof
Assignee: NEC Corp
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Filing: 1989-11-06
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Granted: —
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Expires: 2009-11-06
Abstract
Abstract An oxide superconductor composition essentially consisting of a thallium barium calcium yttrium copper oxide: Tl m Ba₂(Ca 1-x Y x ) n-1 Cu n O 2+m+2n wherein m = 1, n = 2 and 0.1 ≦ x ≦ 0.7, m = 1, n = 3 and 0.1 ≦ x ≦ 0.8 or m = 1, n = 4 and 0.1 ≦ x ≦ 0.8 or m = 2, n = 3 and 0.1 ≦ x ≦ 0.4 is provided. This composition has controllable superconducting transition temperature Tc which is variable in accordance with the change of x value and also shows sharp transition into the superconducting state..
Inventors
- 👤 Takashi C/O Nec Corporation Manako
- 👤 Yuichi C/O Nec Corporation Shimakawa
- 👤 Yoshimi C/O Nec Corporation Kubo
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-10 02:10
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/45; C04B35/4504; C04B35/4512; H; H10; H10N; H10N60/00; H10N60/80; H10N60/85; H10N60/855; H10N60/857
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
129 words
An oxide superconductor composition essentially consisting of a thallium barium calcium yttrium copper oxide wherein an atomic ratio of these elements being represented by the formula: Tl m Ba₂(Ca 1-x Y x ) n-1 Cu n O 2+m+2n in which m is 1 or 2, n is 2, 3 or 4 when m is 1 or n is 3 when m is 2, and x is a number within the following ranges: (a) 0.1 ≦ x ≦ 0.7, when m = 1 and n = 2, (b) 0.1 ≦ x ≦ 0.8, when m = 1 and n = 3, (c) 0.1 ≦ x ≦ 0.8, when m - 1 and n = 4, and (d) 0.1 ≦ x ≦ 0.4, when m = 2 and n = 3.
Claim 2
Dependent Claim
129 words
An oxide superconductor composition essentially consisting of a thallium barium calcium yttrium copper oxide wherein an atomic ratio of these elements being represented by the formula: Tl m Ba₂(Ca 1-x Y x ) n-1 Cu n O 2+m+2n in which m is 1 or 2, n is 2, 3 or 4 when m is 1 or n is 3 when m is 2, and x is a number within the following ranges: (a) 0.1 ≦ x ≦ 0.7, when m = 1 and n = 2, (b) 0.1 ≦ x ≦ 0.8, when m = 1 and n = 3, (c) 0.1 ≦ x ≦ 0.8, when m - 1 and n = 4, and (d) 0.1 ≦ x ≦ 0.4, when m = 2 and n = 3.
Claim 3
Dependent Claim
169 words
A process for the production of an oxide superconductor composition essentially consisting of a thallium barium calcium yttrium copper oxide wherein powders of thallium oxide (Tl₂O₃), barium oxide (BaO), calcium oxide (CaO), yttrium oxide (Yl₂O₃) and cupric oxide (CuO) are mixed together in a ratio of giving an atomic ratio of these elements being represented by the formula: Tl m Ba₂(Ca 1-x Y x ) n-1 Cu n O 2+m+2n in which m is 1 or 2, n is 2, 3 or 4 when m is 1 or n is 3 when m is 2, and x is a number within the following ranges: (a) 0.1 ≦ x ≦ 0.7, when m = 1 and n = 2, (b) 0.1 ≦ x ≦ 0.8, when m = 1 and n = 3, (c) 0.1 ≦ x ≦ 0.8, when m = 1 and n = 4, and (d) 0.1 ≦ x ≦ 0.4, when m = 2 and n = 3, pressure molded and subjected to a heat treatment.
Claim 4
Dependent Claim
169 words
A process for the production of an oxide superconductor composition essentially consisting of a thallium barium calcium yttrium copper oxide wherein powders of thallium oxide (Tl₂O₃), barium oxide (BaO), calcium oxide (CaO), yttrium oxide (Yl₂O₃) and cupric oxide (CuO) are mixed together in a ratio of giving an atomic ratio of these elements being represented by the formula: Tl m Ba₂(Ca 1-x Y x ) n-1 Cu n O 2+m+2n in which m is 1 or 2, n is 2, 3 or 4 when m is 1 or n is 3 when m is 2, and x is a number within the following ranges: (a) 0.1 ≦ x ≦ 0.7, when m = 1 and n = 2, (b) 0.1 ≦ x ≦ 0.8, when m = 1 and n = 3, (c) 0.1 ≦ x ≦ 0.8, when m = 1 and n = 4, and (d) 0.1 ≦ x ≦ 0.4, when m = 2 and n = 3, pressure molded and subjected to a heat treatment.
Claim 5
Dependent Claim
27 words
The process according to claim 2, wherein said powders as mixed and pressure molded are wrapped with a gold foil and then subjected to said heat treatment.
Claim 6
Dependent Claim
32 words
The process according to claim 2, wherein as said heat treatment, sintering is made at a temperature in a range of 850 - 910°C, when m = 1 and n = 2.
Claim 7
Dependent Claim
32 words
The process according to claim 2, wherein as said heat treatment, sintering is made at a temperature in a range of 870 - 910°C, when m = 1 and n = 3.
Claim 8
Dependent Claim
32 words
The process according to claim 2, wherein as said heat treatment, sintering is made at a temperature in a range of 875 - 915°C, when m = 1 and n = 4.
Claim 9
Dependent Claim
32 words
The process according to claim 2, wherein as said heat treatment, sintering is made at a temperature in a range of 870 - 910°C, when m = 2 and n = 3.
Claim 10
Dependent Claim
41 words
An oxide superconductor composition essentially consisting of a thallium barium calcium copper oxide wherein a portion of the calcium is replaced by yttrium as a parameter for adjustment of a critical temperature at which the composition changes its property to superconductive.
Claim 11
Dependent Claim
41 words
An oxide superconductor composition essentially consisting of a thallium barium calcium copper oxide wherein a portion of the calcium is replaced by yttrium as a parameter for adjustment of a critical temperature at which the composition changes its property to superconductive.
References Cited (Backward Citations)
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