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High-temperature superconductivity coated conductor buffer layer Eu1-xCaxBiO3, and preparation method thereof

A technology of coated conductors and high-temperature superconductors, which is applied in the Eu1-xCaxBiO3 buffer layer of high-temperature superconducting coated conductors and its preparation field, can solve the problems of high melting point and preparation cost affecting the practical progress of high-temperature coated conductors, and achieve the goal of manufacturing The process is simple, suitable for large-scale deposition, and the effect of low cost

Inactive Publication Date: 2013-12-18
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, most of these materials have high melting points, 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 will seriously affect the practicality of high-temperature coated conductors. progress

Method used

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  • High-temperature superconductivity coated conductor buffer layer Eu1-xCaxBiO3, and preparation method thereof
  • High-temperature superconductivity coated conductor buffer layer Eu1-xCaxBiO3, and preparation method thereof
  • High-temperature superconductivity coated conductor buffer layer Eu1-xCaxBiO3, and preparation method thereof

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Embodiment 1

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

[0027] a.Eu 0.9 Ca 0.1 BiO 3 Preparation of the buffer layer colloid: the precursors Eu, Ca, and Bi nitrate were 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.

[0028] b.Eu 0.9 Ca 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 570°C at a rate of...

Embodiment 2

[0033] The invention provides a buffer layer Eu of a high-temperature superconducting coated conductor 0.8 Ca 0.2 BiO 3 . And a preparation of high temperature superconducting coating conductor Eu 0.8 Ca 0.2 BiO 3 The method for buffer layer thin film, its step is:

[0034] a.Eu 0.8 Ca 0.2 BiO 3 Preparation of the buffer layer colloid: the precursors Eu, Ca, and Bi nitrate were 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.

[0035] b.Eu 0.8 Ca 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 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 560°C at a rate ...

Embodiment 3

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

[0041] a.Eu 0.6 Ca 0.4 BiO 3 Preparation of the buffer layer colloid: the precursors Eu, 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.Eu 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 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 580°C at a rate of 1...

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Abstract

The invention discloses a Eu1-xCaxBiO3 buffer layer of a high-temperature superconductivity coated conductor, and a preparation method thereof. According to the invention, Ca substitution of Eu of a high-temperature superconductivity coated conductor EuBiO3 buffer layer is carried out, such that the element environment and lattice parameters of the EuBiO3 buffer layer are finely tuned, and a lattice mismatching phenomenon of the EuBiO3 buffer layer and a REBCO superconducting layer is adjusted. Therefore, a series of novel high-temperature superconductivity coated conductor buffer layer Eu1-xCaxBiO3 is obtained, wherein 0.1<=x<=0.4. The buffer layer can perform epitaxial growth in air at a temperature of approximately 810 DEG C. The buffer layer is advantaged in compact structure and smooth surface. During a subsequent high-temperature superconductivity coated conductor superconducting layer preparation process, the structure stability is maintained. According to the Eu1-xCaxBiO3 buffer layer preparation method, a chemical solution deposition method in which nitrate is adopted as a precursor is adopted for preparing Eu1-xCaxBiO3 buffer layer. The cost is low, and the method is suitable for large-scale deposition.

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 Eu 1-x Ca x BiO 3 Buffer layer and its preparation technology. Background technique [0002] The second-generation high-temperature superconducting tape, that is, the rare earth barium copper oxide (REBCO) coated conductor, compared with the first-generation high-temperature superconducting tape-bismuth-based tape, REBCO coating or film has more excellent properties under magnetic field. current-carrying performance, and its raw material cost is lower. It has huge development potential and good application prospects in the power system, and will play a major role in energy, transportation, and medical care. In the past 20 years, the preparation and application of coated conductors have been a hot research topic all over the world. [0003] Since the grains of the REBCO film must...

Claims

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Application Information

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