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Method for preparing large-size high-temperature superconducting film

A high-temperature superconducting film and large-scale technology, which is applied in the usage of superconducting elements, superconducting devices, superconducting/high-conducting conductors, etc., can solve the problem of difficulty in preparing large-scale high-temperature films with thickness, uncontrollable, and low surface roughness and other issues, to achieve the effect of meeting the requirements of commercial application, low production cost and high preparation efficiency

Inactive Publication Date: 2021-05-28
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a method for preparing a high-temperature superconducting film by a sol-gel method combined with a dipping and pulling method. PVP polyvinylpyrrolidone is used as a complexing agent to prepare large-sized high-temperature superconducting films with different thicknesses. The film has low surface roughness, and exhibited excellent superconducting properties, which solved the problems of difficult preparation of large-scale high-temperature thin films and uncontrollable thickness, and made it widely used

Method used

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  • Method for preparing large-size high-temperature superconducting film
  • Method for preparing large-size high-temperature superconducting film
  • Method for preparing large-size high-temperature superconducting film

Examples

Experimental program
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Effect test

Embodiment 1

[0028] (1) Configure the reaction solution

[0029] First weigh 0.2g of polyvinylpyrrolidone PVP and put it into a beaker, then weigh 10ml of propionic acid solution and add it to the beaker, stirring is required during the addition. Then stir on a magnetic stirrer for 8 hours until the PVP is completely dissolved in the propionic acid solution to form a uniform and transparent mixed solution. Finally, according to the molar ratio of high-temperature superconducting material elements 2:2:1:2 converted into the corresponding mass, weigh bismuth acetate (1.12g), strontium acetate (0.63g), calcium acetate (0.26g) and copper acetate (0.58 g) Afterwards, the above-mentioned mixed solution was added one by one, and stirred on a magnetic stirrer for 8 hours at room temperature to obtain a precursor sol.

[0030] (2) Preparation of precursor film by dipping and pulling method

[0031] First the SrTiO 3 , MgO or LaAlO 3 The single crystal substrate was put into deionized water, alc...

Embodiment 2

[0035] (1) Configure the reaction solution

[0036] First weigh 0.3g of polyvinylpyrrolidone PVP and put it into a beaker, then weigh 10ml of propionic acid solution and add it to the beaker, stirring is required during the addition. Then stir on a magnetic stirrer for 8.5 hours until the PVP is completely dissolved in the propionic acid solution to form a uniform and transparent mixed solution. Finally, according to the molar ratio of high-temperature superconducting material elements 2:2:1:2 into the corresponding mass, weigh bismuth acetate (1.13g), strontium acetate (0.64g), calcium acetate (0.26g) and copper acetate (0.59 g) Afterwards, the above mixed solution was added one by one, and stirred on a magnetic stirrer for 8.5 hours at room temperature to obtain a precursor sol.

[0037] (2) Preparation of precursor film by dipping and pulling method

[0038] First the SrTiO 3 , MgO or LaAlO 3 The single crystal substrate was put into deionized water, alcohol with a puri...

Embodiment 3

[0041] (1) Configure the reaction solution

[0042]First weigh 0.1g of polyvinylpyrrolidone PVP and put it into a beaker, then weigh 10ml of propionic acid solution and add it to the beaker, stirring is required during the addition. Then stir on a magnetic stirrer for 7.5 hours until the PVP is completely dissolved in the propionic acid solution to form a uniform and transparent mixed solution. Finally, according to the molar ratio of high-temperature superconducting material elements 2:2:1:2 into the corresponding mass, weigh bismuth acetate (1.12g), strontium acetate (0.64g), calcium acetate (0.25g) and copper acetate (0.58 g) Afterwards, the above mixed solution was added one by one, and stirred on a magnetic stirrer for 7.5 hours at room temperature to obtain a precursor sol.

[0043] (2) Precursor film prepared by dipping and pulling method

[0044] First the SrTiO 3 , MgO or LaAlO 3 The single crystal substrate was sequentially put into deionized water, alcohol with ...

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Abstract

The invention provides a method for preparing a large-size high-temperature superconducting film. The method comprises the following steps: preparing a reaction solution: dissolving polyvinylpyrrolidone in a propionic acid solution, stirring until the polyvinylpyrrolidone is completely dissolved in the propionic acid solution to form a uniform and transparent mixed solution, and adding bismuth acetate, strontium acetate, calcium acetate and cupric acetate into the mixed solution one by one to obtain a precursor sol; preparing a precursor film by a dip-coating method: sequentially putting SrTiO3, MgO or LaAlO3 substrates into deionized water, alcohol and an acetone solution, cleaning in an ultrasonic cleaning machine, spin-coating the precursor sol on the SrTiO3, MgO or LaAlO3 substrate for pulling, placing the substrate on a flat plate heater to obtain a precursor film, and controlling the content of polyvinylpyrrolidone to change the sol viscosity and the dipping frequency so as to change the thickness of the film; and preparing a high-temperature film extending towards the same direction: heating and preserving heat of the precursor film, and cooling to room temperature along with a furnace to obtain the high-temperature superconducting film extending towards the same direction with phase purity.

Description

technical field [0001] The invention belongs to the field of material preparation and relates to a method for preparing large-scale high-temperature superconducting thin films. Background technique [0002] Since the discovery of superconductor by Onnes in 1911, as the first macroscopic quantum phenomenon discovered, it has attracted great attention from the scientific community from the very beginning. After more than 100 years of research, it still remains attractive. Because of its zero-resistance and diamagnetic properties, it has been used in many places such as nuclear magnetic resonance imagers, superconducting cables, superconducting qubits, superconducting maglev trains, and superconducting magnets. [0003] Bi2Sr2CanCun+1O8+δ (BSCCO) high-temperature superconductor (HTS) has been widely studied due to its high transition temperature (Tc) and strong anisotropy, and is one of the most popular high-temperature superconducting materials. In particular, Bi2Sr2CaCu2O8+δ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B12/06
CPCH01B12/06Y02E40/60
Inventor 祁阳赵兴明王冬旭
Owner NORTHEASTERN UNIV
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