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Method for preparing high-temperature superconducting gadolinium-barium-copper-oxygen thin film by utilizing chemical solution method

A technology of high-temperature superconducting thin film and chemical solution method, which is applied in metal material coating process, coating, etc., can solve the problems of long cycle, complicated process, rough surface of film, etc., and achieves improved preparation efficiency, low preparation cost, good The effect of superconducting properties

Inactive Publication Date: 2013-09-25
江苏天诚智能集团有限公司 +1
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] 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 high-temperature superconducting gadolinium-barium-copper-oxygen thin film by utilizing chemical solution method
  • Method for preparing high-temperature superconducting gadolinium-barium-copper-oxygen thin film by utilizing chemical solution method
  • Method for preparing high-temperature superconducting gadolinium-barium-copper-oxygen thin film by utilizing chemical solution method

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preparation example Construction

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

[0036] The fluorine-containing gadolinium barium copper oxygen solution is used as the precursor solution, combined with the dipping method or 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 film of gadolinium barium copper oxide into the quartz tube sintering furnace for pretreatment. Ventilation, first through dry O 2 After 30 minutes, the temperature in the furnace was raised to 100°C at any rate, and then the atmosphere was switched to humid O with a water vapor pressure of 4-8kPa. 2 gas, then raise the furnace temperature to 200°C at a rate of 10°C / min, then raise the furn...

Embodiment 1

[0046] 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:

[0047] 1) prepare fluorine-containing gadolinium barium copper oxygen solution;

[0048] 1.1 Dissolve gadolinium acetate (raw material A) in methanol (solvent A), then add diethylenetriamine (complexing agent A), and control the molar ratio of gadolinium acetate:diethylenetriamine:methanol to 1:1.5:15 , to form solution A after stirring and dissolving;

[0049] 1.2 Dissolve barium acetate (raw material B) in aqueous trifluoroacetic acid (complexing agent B) (in order to prevent volatilization of trifluoroacetic acid, add water to trifluoroacetic acid, the volume ratio of trifluoroacetic acid to water is 1:1 ), after stirring and clarification, dry at 50°C to obtain a white solid B; control the molar ratio of barium acetate: trifluoroacetic acid to be 1:2;

[0050] ...

Embodiment 2

[0060] 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:

[0061] 1) prepare fluorine-containing gadolinium barium copper oxygen solution;

[0062] 1.1 Dissolve gadolinium acetate (raw material A) in acrylic acid (solvent A) first, then add diethanolamine (complexing agent A), control the molar ratio of gadolinium acetate:diethanolamine:acrylic acid to 1:1.5:10, stir and dissolve Form solution A;

[0063] 1.2 Dissolve barium hydroxide (raw material B) in aqueous trifluoroacetic acid (complexing agent B) (in order to prevent volatilization of trifluoroacetic acid, add water to trifluoroacetic acid, the volume ratio of trifluoroacetic acid to water is 1:1 ), after being stirred and clarified, a white solid B was obtained by drying at 90°C, and then α-methacrylic acid (solvent B) was added to the white solid B to dilute, and aft...

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Abstract

The invention discloses a method for preparing a high-temperature superconducting gadolinium-barium-copper-oxygen thin film by utilizing a chemical solution method. The method comprises the steps of firstly preparing low-fluorine-gadolinium-barium-copper-oxygen solution which adopts gadolinium oxide or gadolinium acetate tetrahydrate, barium acetate and copper acetate as initial raw materials and adopts a complexing agent, dissolving the initial raw materials in a solvent to form fluorine-contained gadolinium-barium-copper-oxygen solution, then preparing and drying a gel thin film, and finally conducting preprocessing and final processing on the thin film to obtain the high-temperature superconducting GBCO (gadolinium-barium-copper-oxygen) thin film. According to the thin film prepared by the method provided by the invention, the surface of the thin film is smooth, and the thin film has good superconductivity, and is low in preparation cost, simple in process and easy to control; the heat treatment cycle is shortened greatly, and compared with the low-fluorine-gadolinium-barium-copper-oxygen solution prepared by other methods, the method has the advantages that the fluorine content in the low--fluorine-gadolinium-barium-copper-oxygen solution is lower, the preprocessing of the thin film can be completed by the rapid heat processing within the time not more than 2h, and the performances of the obtained thin film can realize the characteristics of high-clinical conversion temperature Tc and high-clinical 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 yttrium barium copper oxide, gadolinium barium copper oxide, neodymium barium copper oxide, etc. Yttrium-based high-temperature superconductor is a high-temperature superconducting material that can be applied in the liquid nitrogen temperature region. 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C26/00C04B35/45C04B35/622
Inventor 陈源清钱大强赵万富
Owner 江苏天诚智能集团有限公司
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