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Preparation method of high temperature superconductive film adopting modified low fluoride solution method

A technology of high-temperature superconducting thin film and solution method, which is applied to superconductor components and other directions, can solve problems such as loss of copper ions and easy cracking of thin films, and achieve the effects of low preparation cost, smooth surface, and avoiding loss of copper

Inactive Publication Date: 2013-06-05
XIAN UNIV OF TECH
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  • Abstract
  • Description
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Problems solved by technology

[0005] The invention provides a method for preparing a high-temperature superconducting thin film by a modified low-fluorine solution method, so as to overcome the problem that amine ions are introduced in the process of preparing YBCO thin films in the existing method, causing a large amount of copper ion loss, and the prepared thin film is easy to crack. question

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  • Preparation method of high temperature superconductive film adopting modified low fluoride solution method
  • Preparation method of high temperature superconductive film adopting modified low fluoride solution method
  • Preparation method of high temperature superconductive film adopting modified low fluoride solution method

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preparation example Construction

[0038] 2) Preparation and drying of the gel film:

[0039] The low-fluorine yttrium-barium-copper-oxygen solution is used as the precursor solution, combined with the dip-pulling 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. Yttrium-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 yttrium-barium-copper-oxide;

[0040] 3) Film pretreatment:

[0041] Put the obtained yttrium-barium-copper-oxygen dry film into a quartz tube sintering furnace, and first pass it into humid O with a water vapor pressure of 4-5kPa. 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 h...

Embodiment 1

[0047] This embodiment provides a method for preparing a high-temperature superconducting thin film by a modified low-fluorine solution method, which includes the following steps:

[0048] 1) prepare low-fluorine yttrium barium copper oxygen solution;

[0049] 1.1 Dissolve yttrium oxide in aqueous trifluoroacetic acid (in order to prevent volatilization of trifluoroacetic acid, add water to trifluoroacetic acid, the volume ratio of trifluoroacetic acid to water is 1:1), and heat at 40°C 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 yttrium oxide: trifluoroacetic acid: methanol is 0.5:5 :20;

[0050] 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 be 1: 6: 15, stir and dissolve to obtain solution B;

[0051] 1.3 Dissolve copper acetate in met...

Embodiment 2

[0061] This embodiment provides a method for preparing a high-temperature superconducting thin film by a modified low-fluorine solution method, which includes the following steps:

[0062] 1) prepare low-fluorine yttrium barium copper oxygen solution;

[0063] 1.1 Dissolve yttrium acetate in aqueous trifluoroacetic acid (in order to prevent volatilization of trifluoroacetic acid, add water to trifluoroacetic acid, the volume ratio of trifluoroacetic acid to water is 1:2), and heat at 50°C 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 yttrium acetate: trifluoroacetic acid: acrylic acid was 1:3: 30;

[0064] 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 acetate: acrylic acid: methanol to be 1: 10: 20, st...

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Abstract

The invention discloses a preparation method of a high temperature superconductive film adopting a modified low fluoride solution method, which comprises the following steps: dissolving yttrium oxide, barium acetate and copper acetate as raw materials in a solvent using a complexing agent to obtain a low fluoride yttrium barium copper oxygen solution, preparing a gel film and drying, and performing pretreatment and end treatment of the film. The sol has easily adjustable composition, stable performance and good film forming property, the yttrium barium copper oxygen superconductive film can be easily prepared using the sol, and the heat treatment cycle is short and the process repeatability is high. In addition, the solution avoids the introduction of amine group, so as not only to avoid the loss of copper in the heat treatment, but also to avoid the problem that the film is easy to craze. The method of the invention is also used for preparing large-area or long-distance yttrium barium copper oxygen films and coated conductors, the obtained yttrium barium copper oxygen film has good surface smoothness and has good superconductivity.

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 high-temperature superconducting thin film by a modified low-fluorine solution method. Background technique [0002] Yttrium-based high-temperature superconductors, including yttrium-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 coupling antenna, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L39/12C04B35/45C04B35/622
Inventor 陈源清赵高扬薛人中
Owner XIAN UNIV OF TECH
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