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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 in the field of high-temperature superconducting microelectronic materials and devices and the field of coating conductor preparation, which can solve the problems of easy cracking of thin films and loss of copper ions, etc. Avoid the effect of easy cracking

Inactive Publication Date: 2012-07-04
XIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 gel film:

[0039] Using low fluoride yttrium barium copper oxygen solution as the precursor solution, combined with dipping and pulling method or spin coating method, on lanthanum aluminate or strontium titanate single crystal substrate, or NiW alloy strip with buffer layer, prepared The yttrium barium copper oxide gel film, and then the obtained gel film is dried in the air at a temperature of 80-100°C for 5-20 minutes to obtain a yttrium barium copper oxide dry film;

[0040] 3) Film pretreatment:

[0041] Put the obtained yttrium-barium-copper-oxygen dry film into a quartz tube sintering furnace, and first pass moist O with a water vapor pressure of 4~5kPa 2 Then increase the temperature in the furnace to 200℃ at any rate, and then increase the temperature in the furnace to 400~500℃ at a rate of 2~20℃ / min, and keep it for 5~15min; finally, it will be cooled to Room temperature, and stop passing in moisture O 2 In the above pretreatment process...

Embodiment 1

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

[0048] 1) Preparation of low fluorine yttrium barium copper oxygen solution;

[0049] 1.1 Dissolve yttrium oxide in trifluoroacetic acid containing water (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 it at 40°C After stirring and dissolving, drying at 70℃ to obtain white solid A, then adding methanol to white solid A for dilution, stirring and dissolving 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 a 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 B;

[0051] 1.3 First dissolve copper acetate...

Embodiment 2

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

[0062] 1) Preparation of low fluorine yttrium barium copper oxygen solution;

[0063] 1.1 Dissolve yttrium acetate in trifluoroacetic acid containing water (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, after drying at 90°C, a white solid A is obtained. Then acrylic acid is added to the white solid A for dilution. After stirring and dissolving, a solution A is obtained; the molar ratio of yttrium acetate:trifluoroacetic acid:acrylic acid is 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 1:10:20, stir and dissolve to...

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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 film by a modified low-fluorine solution method. Background technique [0002] Yttrium-based high-temperature superconductors, including yttrium barium copper oxide, ytterbium barium copper oxide, neodymium barium copper oxide, etc., are high-temperature superconducting materials that can be applied in the liquid nitrogen temperature zone. Yttrium-based high-temperature superconducting films have excellent electromagnetic properties, especially higher critical current density than the first-generation bismuth-based strips under high fields. On the one hand, they can be used in weak current fields such as microelectronic devices to make various A kind of high, precise and sharp electronic devices, such as superconducting...

Claims

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Application Information

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IPC IPC(8): C04B35/45C04B35/622
Inventor 陈源清赵高扬薛人中
Owner XIAN UNIV OF TECH
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