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Multilayer composite structure rare earth barium copper oxygen superconducting film and preparation method thereof

A rare earth barium copper oxide and multi-layer composite technology, which is applied in the direction of cable/conductor manufacturing, equipment for manufacturing conductive/semiconductive layers, electrical components, etc., can solve the problem that the thickness dependence effect mechanism of critical current density is not very clear, low Unfavorable cost preparation and other issues

Active Publication Date: 2018-09-21
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the mechanism of the thickness-dependent effect of the critical current density is not very clear
This effect is obviously unfavorable for the low-cost preparation of the second-generation high-temperature superconducting tape

Method used

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  • Multilayer composite structure rare earth barium copper oxygen superconducting film and preparation method thereof
  • Multilayer composite structure rare earth barium copper oxygen superconducting film and preparation method thereof
  • Multilayer composite structure rare earth barium copper oxygen superconducting film and preparation method thereof

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preparation example Construction

[0030] refer to Figure 1 to Figure 8 , in one embodiment, a method for preparing a rare earth barium copper oxide high temperature superconducting film of a multilayer composite structure, comprising: alternately depositing REBa on a substrate 1+x CuO 7-y film and metal layer, the formed superconducting film is expressed as (REBa 1+ x CuO 7-y / M)n, where RE is a rare earth element, M represents the metal layer, 0.5≤x≤1, 01+x CuO 7-y Use chemical solution coating, the precursor used in the chemical solution coating contains salts of rare earth metals, barium and copper, the metal layer is deposited by physical vapor phase, and the multilayer composite structure of rare earth barium copper is obtained after heat treatment Oxygen superconducting film.

[0031] The present invention addresses the critical current density thickness dependence effect of the key problem in the preparation of superconducting films, and proposes a new process idea: using physical vapor deposition...

example 1

[0053] The preparation process is as figure 2 As shown, first according to the metal cation molar ratio of 1:(1+x):3 (where 0.5≤x≤1), yttrium acetate tetrahydrate, gadolinium acetate, barium acetate, and copper acetate monohydrate were dissolved by stirring in deionized water, and added trifluoroacetic acid to it. After two rotary vacuum evaporation processes, the above-mentioned metal salt was finally dissolved in methanol to obtain a clear, transparent, dark blue precursor precursor. The total concentration of metal elements in the precursor solution is 0.5-3mol / L. The precursor solution is coated by spin coating-ion beam deposition-spin coating multiple times, and no pyrolysis is required during the coating process, which avoids the erosion of the pyrolytic film by water vapor. On this basis, we prepared (Y 0.9 Gd 0.1 Ba 1.5 Cu 3 o 7-δ ) x / Au y Multilayer film, the schematic diagram of which is shown in figure 1 1-1 in the figure represents the substrate, which ...

example 2

[0055] Prepare according to the step in example 1 (Y 0.9 Gd 0.1 Ba 1.5 Cu 3 o 7-δ ) 3 / (Au) 2 Five-layer film samples. From Figure 5 It can be seen from the cross-sectional picture that the thickness of the sample is greater than 1.1 μm, and the critical current density obtained by measuring the AC magnetic susceptibility reaches 1.3MA / cm 2 . pass Figure 6 , XRD measurements found that Au ions basically did not replace Y 0.9 Gd0.1 Ba 1.5 Cu 3 o 7-δ The metal ions in the metal ions mainly exist in the form of elemental Au.

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Abstract

The invention discloses a multilayer composite structure rare earth barium copper oxygen superconducting film and a preparation method thereof. The preparation method comprises the steps that REBa1+xCuO7-y films and metal layers are alternately deposited on a substrate; a formed superconducting film is expressed as (REBa1+xCuO7-y / M)n, wherein RE is a rare earth element and M represents a metal layer; x is between 0.5 and 1, and y is greater than 0 and less than 0.5; REBa1+xCuO7-y is coated with a chemical solution; a precursor used by the coating of the chemical solution contains the salt of rare earth metal, barium and copper; each metal layer is subjected to physical vapor deposition; and heat treatment is carried out to acquire the multilayer composite structure rare earth barium copperoxygen superconducting film. The preparation method provided by the invention can be used to acquire the superconducting film of high quality and high critical current density.

Description

technical field [0001] The invention belongs to the technical field of high-temperature superconducting materials, and in particular relates to a multilayer composite structure rare earth barium copper oxide superconducting film and a preparation method thereof. Background technique [0002] Rare earth barium copper oxide (REBa 1+x Cu 3 o 7-y , where RE is a rare earth element such as Y, Gd, Sm, etc., 0.5≤x≤1, 0<y<0.5) The high-temperature superconducting film is the core component of the second-generation high-temperature superconducting wire (also known as a coated conductor) part, it has a very high self-field critical current density (generally higher than 1MA / cm 2 ), and is suitable for applications in high magnetic field environments. The techniques for preparing high-temperature superconducting films mainly include vacuum deposition and chemical solution deposition. At present, the most used vacuum depositions in the world are mainly pulsed laser deposition ...

Claims

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Application Information

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IPC IPC(8): H01B13/00
CPCH01B13/0026
Inventor 冯峰黄荣厦杨置荣汪林立母辉瞿体明
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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