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Preparation method of yttrium-barium-copper-oxidize superconducting film

A technology of yttrium-barium-copper-oxygen superconducting thin film, which is applied in the field of preparation of yttrium-barium-copper-oxygen superconducting thin film, can solve problems such as surface roughness of the yttrium-barium-copper-oxygen superconducting thin film, and achieve simple and easy preparation method and high preparation efficiency , the effect of excellent superconductivity

Active Publication Date: 2013-05-08
XIAN UNIV OF TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a preparation method of yttrium barium copper oxide superconducting film, which solves the problem of excessive molten barium hydroxide existing in the heat treatment process of the fluorine-free process of the existing chemical solution deposition method, which makes the yttrium barium copper oxide superconducting film The problem that the surface of the guide film becomes rough

Method used

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  • Preparation method of yttrium-barium-copper-oxidize superconducting film

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preparation example Construction

[0019] The preparation method of the yttrium-barium-copper-oxygen superconducting thin film of the present invention is as follows: firstly, a fluorine-free yttrium-barium-copper-oxysol sol is prepared on a single crystal lanthanum aluminate substrate to obtain a yttrium-barium-copper-oxygen gel film, and the yttrium-barium-copper-oxygen gel film is dried after drying. The yttrium-barium-copper-oxygen superconducting thin film is obtained by successively undergoing heat treatment, crystallization and oxygen infiltration treatment.

[0020] Specific steps are as follows:

[0021] Step 1, dissolving yttrium acetate, barium acetate and copper acetate in methanol with diethylenediamine, lactic acid and acrylic acid respectively to form three solutions, then mixing and stirring the above three solutions to obtain fluorine-free yttrium barium copper oxygen sol, acetic acid The molar ratio of yttrium, barium and copper in yttrium, barium acetate and copper acetate is 1~1.5:2:3~4;

...

Embodiment 1

[0029] Step 1, dissolving yttrium acetate, barium acetate and copper acetate in methanol with diethylenediamine, lactic acid and acrylic acid respectively to form three solutions, and then mixing and stirring the above three solutions to obtain a fluorine-free yttrium barium copper oxygen sol, wherein The molar ratio of yttrium, barium and copper in yttrium acetate, barium acetate and copper acetate is 1:2:3;

[0030] Step 2, using the fluorine-free yttrium-barium-copper-oxysol sol obtained in step 1 to prepare a yttrium-barium-copper-oxygen gel film on a single crystal lanthanum aluminate substrate, and then drying in air at 80° C. for 30 minutes to obtain fluorine-free yttrium-barium-copper Oxygen gel film;

[0031] In step 3, the fluorine-free yttrium barium copper oxide gel film obtained in step 2 is moved to a horizontal quartz tubular atmosphere sintering furnace with a preset temperature of 100 ° C for heat treatment. The temperature was raised to 350 °C in a mixed atm...

Embodiment 2

[0034] Step 1, dissolving yttrium acetate, barium acetate and copper acetate in methanol with diethylenediamine, lactic acid and acrylic acid respectively to form three solutions, and then mixing and stirring the above three solutions to obtain a fluorine-free yttrium barium copper oxygen sol, wherein The molar ratio of yttrium, barium and copper in yttrium acetate, barium acetate and copper acetate is 1.15:2:3.2;

[0035] Step 2, using the fluorine-free yttrium-barium-copper-oxysol sol obtained in step 1 to prepare a yttrium-barium-copper-oxygen gel film on a single crystal lanthanum aluminate substrate, and then drying in high-purity argon at 90° C. for 20 minutes to obtain a fluorine-free Yttrium barium copper oxide gel film;

[0036]Step 3, move the fluorine-free yttrium barium copper oxide gel film obtained in step 2 to a horizontal quartz tubular atmosphere sintering furnace with a preset temperature of 100°C for heat treatment. The specific steps of heat treatment are: ...

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Abstract

The invention discloses a preparation method of a yttrium-barium-copper-oxidize superconducting film. The method comprises the following steps: preparing a yttrium-barium-copper-oxidize sol without fluorine into a yttrium-barium-copper-oxidize gel film on a monocrystal lanthanum aluminate substrate; after drying the obtained gel film, sequentially carrying out overheating treatment, crystallization treatment and oxygen permeating treatment on the gel film; and cooling the gel film, thereby obtaining the yttrium-barium-copper-oxidize superconducting film. According to the method, carbon dioxide is led into a low-temperature heat treatment process to control the conversion of a barium-contained phase, so that a reversible reaction, namely (Ba(OH)2+CO2=BaCO3+H2O is always performed in the direction at which barium carbonate is generated, so that the problem of rough surface of the yttrium-barium-copper-oxidize superconducting film due to the fact that barium hydroxide is molten at a high temperature is solved. In addition, water vapor is led into a high-temperature heat treatment process, so that the reversible reaction is performed in the direction at which the barium hydroxide is generated, so that the barium carbonate is completely converted into the barium hydroxide; and the barium hydroxide can further react with yttrium oxide and copper oxide to generate a yttrium-barium-copper-oxidize phase, and therefore, the yttrium-barium-copper-oxidize film with the good surface quality and the excellent superconducting performance is obtained.

Description

technical field [0001] The invention belongs to the technical field of superconducting materials, and relates to a preparation method of a yttrium barium copper oxide superconducting thin film. Background technique [0002] Yttrium barium copper oxide (YBa 2 Cu 3 O 7-δ ), referred to as YBCO, is a high-temperature superconducting material that can realize superconductivity applications in the liquid nitrogen temperature region. With its excellent electrical properties, YBCO superconducting thin films are widely used in weak electric fields (such as making superconducting quantum interferometers, superconducting coupling antennas, superconducting filters, etc.) and strong electric fields (such as preparing second-generation high-temperature superconducting tapes—YBCO coatings conductors) have shown attractive application prospects. [0003] At present, the simplest and cheapest method for preparing YBCO superconducting thin films is chemical solution deposition, which can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/45C04B35/624C04B35/64
Inventor 雷黎赵高扬
Owner XIAN UNIV OF TECH
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