Method for preparing gadolinium-barium-copper-oxygen (GdBCO) high-temperature superconducting thin film by using chemical solution method

A technology of high-temperature superconducting thin film and chemical solution method, which is applied in the manufacture/processing of superconductor devices, can solve the problems of complex process, rough surface of the film, and long cycle, and achieve low preparation cost, improved preparation efficiency, and high critical current effect of density

Inactive Publication Date: 2014-02-19
XIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The invention provides a method for preparing a gadolinium-barium-copper-oxygen high-temperature superconducting thin film by a chemical solution method, so as to overcome the disadvantages of rough surface of the thin film caused by introducing a large amount of fluorine in the existing method, complex process and long cycle time

Method used

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  • Method for preparing gadolinium-barium-copper-oxygen (GdBCO) high-temperature superconducting thin film by using chemical solution method
  • Method for preparing gadolinium-barium-copper-oxygen (GdBCO) high-temperature superconducting thin film by using chemical solution method
  • Method for preparing gadolinium-barium-copper-oxygen (GdBCO) high-temperature superconducting thin film by using chemical solution method

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preparation example Construction

[0035] 2) Preparation and drying of the gel film:

[0036] The low-fluorine gadolinium barium copper oxygen solution is used as the precursor solution, combined with the dipping method or the spin coating method, on the lanthanum aluminate or strontium titanate single crystal substrate, or on the NiW alloy strip with a buffer layer. Gadolinium-barium-copper-oxygen gel film, followed by drying the obtained gel film under air at a temperature of 80-100°C for 5-20 minutes to obtain a dry film of gadolinium-barium-copper-oxygen;

[0037] 3) Film pretreatment:

[0038] Put the obtained dry gadolinium-barium-copper-oxygen film into a quartz tube sintering furnace. 2 Then raise the temperature in the furnace to 200°C at any rate, then raise the temperature in the furnace to 400-500°C at a rate of 2-20°C / min, and keep it warm for 5-15 minutes; finally cool down naturally with the furnace to room temperature, and stop the humid O 2 gas; during the above pretreatment process, the sin...

Embodiment 1

[0044] This embodiment provides a method for preparing a gadolinium-barium-copper-oxygen high-temperature superconducting thin film by a chemical solution method, and the specific operation steps are as follows:

[0045] 1) Preparation of low-fluorine gadolinium barium copper oxygen solution:

[0046] 1.1 Dissolve gadolinium oxide in aqueous trifluoroacetic acid (in order to prevent the volatilization of trifluoroacetic acid, add water to trifluoroacetic acid, the volume ratio of trifluoroacetic acid to water is 1:1), and heat at 40 ℃ After stirring and dissolving, dry at 70°C to obtain white solid A, then add methanol to white solid A for dilution, stir and dissolve to obtain solution A; wherein, the molar ratio of gadolinium oxide: trifluoroacetic acid: methanol is 0.5:5 :20;

[0047] 1.2 Dissolve barium acetate in the mixed solution of lactic acid and methanol, control the molar ratio of barium acetate: lactic acid: methanol to 1:6:15, stir and dissolve to obtain solution ...

Embodiment 2

[0058] This embodiment provides a method for preparing a gadolinium-barium-copper-oxygen high-temperature superconducting thin film by a chemical solution method, and the specific operation steps are as follows:

[0059] 1) Preparation of low-fluorine gadolinium barium copper oxygen solution;

[0060] 1.1 Dissolve gadolinium acetate in aqueous trifluoroacetic acid (in order to prevent the volatilization of trifluoroacetic acid, add water to trifluoroacetic acid, the volume ratio of trifluoroacetic acid to water is 1:2), and heat at 50 ℃ After stirring and dissolving, a white solid A was obtained after drying at 90°C, and acrylic acid was added to the white solid A for dilution, and after stirring and dissolving, a solution A was obtained; the molar ratio of gadolinium acetate: trifluoroacetic acid: acrylic acid was 1:3: 30;

[0061] 1.2 Dissolve barium acetate in a mixed solution of acrylic acid (complexing agent B) and methanol (solution B), control the molar ratio of barium...

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Abstract

The invention discloses a method for preparing a gadolinium-barium-copper-oxygen (GdBCO) high-temperature superconducting thin film by using a chemical solution method. The method comprises the steps of: firstly, preparing a low-fluorine GdBCO solution, wherein the low-fluorine GdBCO solution is prepared by adopting gadolinium oxide or gadolinium acetate, barium acetate and copper acetate as initial raw materials, adopting a complexing agent and dissolving the initial raw materials in a solvent; then, preparing and drying a gel thin film; and finally carrying out preprocessing and final processing on the thin film to obtain the GdBCO high-temperature superconducting thin film. The thin film prepared by using the method provided by the invention is smooth in surface, favorable in supoerconducting property, low in preparation cost and simple in a process which is easy to control; and the period of a thermal treatment process is greatly shortened, compared with low-fluorine GdBCO solutions prepared with other methods, the GdBCO high-temperature superconducting thin film is lower in fluorine content and can be preprocessed through rapid thermal treatment being less than 2 hours, and the obtained thin film also has the characteristics of high critical transformation temperature Tc and high critical current density Jc.

Description

technical field [0001] The invention relates to the field of high-temperature superconducting microelectronic materials and devices and the technical field of coating conductor preparation, in particular to a method for preparing a gadolinium-barium-copper-oxygen high-temperature superconducting thin film by a chemical solution method. Background technique [0002] Yttrium-based high-temperature superconductors, including gadolinium-barium-copper-oxygen, ytterbium-barium-copper-oxygen, and neodymium-barium-copper-oxygen, are high-temperature superconducting materials that can be applied in the liquid nitrogen temperature zone. Yttrium-based high-temperature superconducting thin films have excellent electromagnetic properties, especially higher critical current densities than the first-generation bismuth-based tapes at high fields. A kind of high, precise and sharp electronic devices, such as superconducting quantum interferometer (SQUID), Josephson junction, superconducting ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L39/24
Inventor 陈源清赵高扬
Owner XIAN UNIV OF TECH
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