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Gd[1-x]Pb[x]BiO3 buffer layer for high-temperature superconducting coated conductor and preparation method thereof

A coated conductor and high-temperature superconducting technology, which is applied in the field of high-temperature superconducting material preparation, can solve the problems that the production cost affects the practical progress of high-temperature coated conductors, high melting point, etc., and achieves suitable for large-scale deposition, simple manufacturing process, and low cost. high effect

Inactive Publication Date: 2012-10-03
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of these materials have a high melting point, and they need to be epitaxially grown at about 1000°C to form a buffer layer with good performance, and they need to be prepared under low oxygen partial pressure. The high preparation cost seriously affects the practical application of high-temperature coated conductors. progress

Method used

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  • Gd[1-x]Pb[x]BiO3 buffer layer for high-temperature superconducting coated conductor and preparation method thereof
  • Gd[1-x]Pb[x]BiO3 buffer layer for high-temperature superconducting coated conductor and preparation method thereof
  • Gd[1-x]Pb[x]BiO3 buffer layer for high-temperature superconducting coated conductor and preparation method thereof

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Effect test

Embodiment 1

[0027] The invention provides a buffer layer Gd of a high-temperature superconducting coated conductor 0.9 Pb 0.1 BiO 3 . And a preparation of high temperature superconducting coating conductor Gd 0.9 Pb 0.1 BiO 3 The method for buffer layer thin film, its step is:

[0028] a.Gd 0.9 Pb 0.1 BiO 3 Preparation of the buffer layer colloid: the precursors Gd, Pb, and Bi nitrate are dissolved in an appropriate amount of polyacrylic acid (PAA) at a cation concentration of 0.9:0.1:1 to obtain an organic system. The total molar concentration of the final solution is about 0.2mol / L.

[0029] b.Gd 0.9 Pb 0.1 BiO 3 Buffer layer coating, drying and decomposition: coating the colloid prepared in step a on LaAlO 3 on a single crystal substrate, and then dried at 100°C; then placed in a sintering furnace, and the furnace temperature was slowly raised from room temperature to 110°C in the air, and then raised to 280°C at a speed of 0.1°C / min, and then Raise to 510°C at a rate of ...

Embodiment 2

[0034] The invention provides a buffer layer Gd of a high-temperature superconducting coated conductor 0.85 Pb 0.15 BiO 3 . And a preparation of high temperature superconducting coating conductor Gd 0.85 Pb 0.15 BiO 3 The method for buffer layer thin film, its step is:

[0035] a.Gd 0.85 Pb 0.15 BiO 3 Preparation of the buffer layer colloid: the precursors Gd, Pb, and Bi nitrate are dissolved in an appropriate amount of polyacrylic acid (PAA) at a cation concentration of 0.7:0.3:1, thereby obtaining an organic system. The total molar concentration of the final solution is about 0.2mol / L.

[0036] b.Gd 0.85 Pb 0.15 BiO 3 Buffer layer coating, drying and decomposition: coating the colloid prepared in step a on LaAlO 3 on a single crystal substrate, and then dried at 110°C; then placed in a sintering furnace, and the furnace temperature was slowly raised from room temperature to 120°C in the air, and raised to 300°C at a speed of 2°C / min, and then Raise to 520°C at ...

Embodiment 3

[0041] The invention provides a buffer layer Gd of a high-temperature superconducting coated conductor 0.8 Pb 0.2 BiO 3 . And a preparation of high temperature superconducting coating conductor Gd 0.8 Pb 0.2 BiO 3 The method for buffer layer thin film, its step is:

[0042] a.Gd 0.8 Pb 0.2 BiO 33 Preparation of the buffer layer colloid: the precursors Gd, Pb, and Bi nitrate are dissolved in an appropriate amount of polyacrylic acid (PAA) at a cation concentration of 0.6:0.4:1 to obtain an organic system. The total molar concentration of the final solution is about 0.2mol / L.

[0043] b.Gd 0.8 Pb 0.2 BiO 3 Buffer layer coating, drying and decomposition: coating the colloid prepared in step a on LaAlO 3 on a single crystal substrate, and then dried at 120°C; then placed in a sintering furnace, and the furnace temperature was slowly raised from room temperature to 130°C in the air, and then raised to 290°C at a speed of 1°C / min, and then Raise to 530°C at a rate of 1...

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Abstract

The invention discloses a Gd[1-x]Pb[x]BiO3 buffer layer for preparing a high-temperature superconducting coated conductor and a preparation method of the buffer layer, after Gd is substituted by Pb for the Gd[1-x]Pb[x]BiO3 buffer layer for the high-temperature superconducting coated conductor, the GdBiO3 buffer layer element environment and lattice parameters are finely adjusted, so as to regulate the lattice mismatch condition of the GdBiO3 buffer layer and a REBCO superconductive layer to obtain a series of new Gd[1-x]Pb[x]BiO3 buffer layers for the high-temperature superconducting coated conductor, wherein x is more than or equal to 0.1 and less than or equal to 0.2. In addition, the buffer layer can be epitaxially grown in the air at about 810 DEG C, the structure of the buffer layer is dense and the surface of the buffer layer is smooth. The structure can be kept stable in the subsequent preparation process of the superconducting layer of the high-temperature superconducting coated conductor. The invention discloses a preparation method of the Gd[1-x]Pb[x]BiO3 buffer layer, in the method, nitrate is adopted as a precursor of a chemical solution deposition method to prepare the Gd[1-x]Pb[x]BiO3 buffer layer in the air, and the preparation method has the advantages of being low in cost, being suitable for large-scale deposition and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation of high-temperature superconducting materials, in particular to a high-temperature superconducting coated conductor Gd 1-x Pb x BiO 3 Buffer layer and its preparation technology. Background technique [0002] Compared with the first-generation high-temperature superconducting tape, that is, the bismuth-based tape, the second-generation high-temperature superconducting tape, that is, the rare earth barium copper oxide (REBCO) coated conductor, has a series of obvious advantages: low raw material production cost; current density Higher and higher magnetic flux pinning ability; the anisotropy of superconductivity is relatively weak; it can have better current-carrying capacity than the first generation of high-temperature superconducting materials in the liquid nitrogen temperature region and higher magnetic field, and will It is a superconducting material used in the field of strong electrici...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/453C04B35/622
Inventor 张欣赵勇程翠华张勇
Owner SOUTHWEST JIAOTONG UNIV