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Sm1-xCaxBiO3 buffering layer of high-temperature superconductivity coated conductor and preparation method thereof

A technology of coating conductors and high temperature superconductivity, which is applied in the field of high temperature superconducting material preparation, can solve the problems that the preparation cost affects the practical progress of high temperature coated conductors and the high melting point, and is suitable for large-scale deposition, simple production 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

AI Technical Summary

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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  • Sm1-xCaxBiO3 buffering layer of high-temperature superconductivity coated conductor and preparation method thereof
  • Sm1-xCaxBiO3 buffering layer of high-temperature superconductivity coated conductor and preparation method thereof
  • Sm1-xCaxBiO3 buffering layer of high-temperature superconductivity coated conductor and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0026] The invention provides a buffer layer Sm of a high-temperature superconducting coated conductor 0.9 Ca 0.1 BiO 3 . And a preparation of high temperature superconducting coating conductor Sm 0.9 Ca 0.1 BiO 3 The method for buffer layer thin film, its step is:

[0027] a.Sm 0.9 Ca 0.1 BiO 3 Preparation of the buffer layer colloid: the precursors Sm, Ca, and Bi nitrate were dissolved in an appropriate amount of polyacrylic acid (PAA) at a cation concentration of 0.9:0.1:1, thereby obtaining an organic system. The total molar concentration of the final solution is about 0.2mol / L.

[0028] b.Sm 0.9 Ca 0.1 BiO 3 Buffer layer coating, drying and decomposition: coating the colloid prepared in step a on LaAlO 3 On the single crystal substrate, dry at 100°C; then place it in a sintering furnace, slowly raise the furnace temperature from room temperature to 180°C in the air, and increase it to 280°C at a speed of 0.1°C / min, and then Raise to 570°C at a rate of 0.1°C / ...

Embodiment 2

[0033] The invention provides a buffer layer Sm of a high-temperature superconducting coated conductor 0.7 Ca 0.3 BiO 3 . And a preparation of high temperature superconducting coating conductor Sm 0.7 Ca 0.3 BiO 3 The method for buffer layer thin film, its step is:

[0034] a.Sm 0.7 Ca 0.3 BiO 3 Preparation of the buffer layer colloid: the precursors Sm, Ca, and Bi nitrate are dissolved in an appropriate amount of polyacrylic acid (PAA) at a cation concentration of 0.7:0.3:1 to obtain an organic system. The total molar concentration of the final solution is about 0.2mol / L.

[0035] b.Sm 0.7 Ca 0.3 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 200°C in the air, and then raised to 300°C at a speed of 2°C / min, and then Raise to 560°C at a rate of 0....

Embodiment 3

[0040] The invention provides a buffer layer Sm of a high-temperature superconducting coated conductor 0.6 Ca 0.4 BiO 3 . And a preparation of high temperature superconducting coating conductor Sm 0.6 Ca 0.4 BiO 3 The method for buffer layer thin film, its step is:

[0041] a.Sm 0.6 Ca 0.4 BiO 3 Preparation of the buffer layer colloid: the precursors Sm, Ca, and Bi nitrate were 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.

[0042] b.Sm 0.6 Ca 0.4 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 150°C; then placed in a sintering furnace, and the furnace temperature was slowly raised from room temperature to 230°C in the air, and then raised to 290°C at a speed of 1°C / min, and then Raise to 580°C at a rate of 1...

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Abstract

The invention discloses a Sm1-xCaxBiO3 buffering layer of a high-temperature superconductivity coated conductor and a preparation method thereof. After Ca replaces Sm of a SmBiO3 buffering layer of the high-temperature superconductivity coated conductor, the element environment and lattice parameters of the SmBiO3 buffering layer are finely adjusted, accordingly the situation that lattices of the SmBiO3 buffering layer and an REBCO superconductivity layer are mismatched with each other is improved, and a series of novel Sm1-xCaxBiO3 buffering layer of the high-temperature superconductivity coated conductor is obtained, wherein the x is greater than or equal to 0.1 and less than or equal to 0.4. In addition, the buffering layer can extend and grow in the air with the temperature of 800 DEG C and is compact in structure and flat in surface, and the structural stability is kept in the follow-up preparation process of the superconductivity layer of the high-temperature superconductivity coated conductor. The method adopts a chemical solution sedimentation process using nitrate as a predecessor to perform preparation in the air and has the advantages of being low in cost, suitable for large-scale sedimentation and the like.

Description

technical field [0001] The invention belongs to the technical field of high-temperature superconducting material preparation, in particular to a high-temperature superconducting coated conductor Sm 1-x Ca x BiO 3 Buffer layer and its preparation technology. Background technique [0002] As the second-generation high-temperature superconducting tape, rare-earth barium copper oxide (REBCO) coated conductors have broad application prospects in power systems due to their excellent current-carrying capacity under high magnetic fields. For example, there are many applications in various superconducting devices, such as cables, transformers, generators and motors. Starting from the technological innovation and long-term interests of their own electric energy, the developed countries vigorously promote the research and practical application of the second generation of high-temperature superconductors , the international competition is becoming more and more fierce. [0003] Howe...

Claims

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Application Information

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IPC IPC(8): C04B35/453C04B35/622
Inventor 张欣赵勇程翠华张勇
Owner SOUTHWEST JIAOTONG UNIV
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