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a kind of laalo <base:sub> 3</base:sub> Preparation method of doped composite ybco thin film

A technology of thin film and precursor liquid, which is applied in the field of composite thin film preparation, to achieve the effects of reducing damage, shortening the sintering process time and improving the current carrying capacity

Active Publication Date: 2017-07-14
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems existing in the preparation process of the existing coating conductor transition layer, and to provide a new type of LaAlO 3 (LAO) Doped Composite YBCO Thin Films

Method used

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  • a kind of laalo &lt;base:sub&gt; 3&lt;/base:sub&gt; Preparation method of doped composite ybco thin film
  • a kind of laalo &lt;base:sub&gt; 3&lt;/base:sub&gt; Preparation method of doped composite ybco thin film
  • a kind of laalo &lt;base:sub&gt; 3&lt;/base:sub&gt; Preparation method of doped composite ybco thin film

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1) Dissolve 0.127g of lanthanum acetylacetonate and 0.046g of aluminum acetylacetonate and 1.69g of yttrium acetate and 2.55g of barium acetate into deionized water according to the LAO doping amount of 5% (molar doping amount), and then add 4ml of trifluoroacetic anhydride, stirred at 50°C for 2h to obtain precursor solution A; dissolved 3g of copper acetate in deionized water, added 6ml of acrylic acid, stirred in 80°C water bath for 1h to obtain precursor solution B; mixed all A and B , distilled at 60°C; add anhydrous methanol after distilling the water, repeat the distillation 3 times, and finally use anhydrous methanol to set the volume to 20ml to obtain a composite YBCO solution with a molar doping amount of LAO of 5%.

[0026] 2) Coating the precursor solution onto the (001) LAO single crystal substrate by spin coating, the rotation speed is 6000rpm, and the time is 60s to obtain the precursor film;

[0027] 3) Under the condition of passing dry oxygen, the prec...

Embodiment 2

[0031] 1) According to the LAO doping amount is 7.5% content, 0.191g lanthanum acetylacetonate and 0.122g aluminum acetylacetonate and 1.69g yttrium acetate and 2.55g barium acetate are dissolved in deionized water, then add 4ml trifluoroacetic anhydride, in Stir at 50°C for 8 hours to obtain precursor solution A; dissolve 3g of copper acetate in deionized water, add 6ml of acrylic acid, stir in a water bath at 80°C for 3 hours to obtain precursor solution B; mix A and B completely, and distill at 60°C; After distilling off the water, add anhydrous methanol, repeat the distillation 3 times, and finally set the volume to 20ml with anhydrous methanol to obtain a composite YBCO solution with a molar doping amount of LAO of 7.5%.

[0032] 2) Coating the precursor solution onto the (001) LAO single crystal substrate by spin coating, the rotation speed is 4000rpm, and the time is 120s to obtain the precursor film;

[0033] 3) Under the condition of passing dry oxygen, the precursor ...

Embodiment 3

[0037] 1) According to the LAO doping amount is 2.5% content, 0.064g lanthanum acetylacetonate and 0.041g aluminum acetylacetonate and 1.69g yttrium acetate and 2.55g barium acetate are dissolved in deionized water, then add 4ml trifluoroacetic anhydride, in Stir at 50°C for 4 hours to obtain precursor solution A; dissolve 3g of copper acetate in deionized water, add 6ml of acrylic acid, stir in a water bath at 80°C for 2 hours to obtain precursor solution B; mix all A and B, and distill at 60°C; After distilling off the water, add anhydrous methanol, repeat the distillation 3 times, and finally set the volume to 20ml with anhydrous methanol to obtain a composite YBCO solution with a molar doping amount of LAO of 2.5%.

[0038] 2) Coating the precursor liquid onto the (001) LAO single crystal substrate by spin coating, the rotation speed is 5000rpm, and the time is 100s to obtain the precursor film;

[0039] 3) Under the condition of passing dry oxygen, the precursor film was ...

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Abstract

The invention discloses a preparation method of a LAO (LaAlO3) doped composite YBCO film and belongs to the technical field of preparation of high-temperature superconducting materials. According to the method, organic La salt and Al salt are taken as precursor salts, a precursor solution is prepared with a chemical solution method and then applied to an LAO single crystal substrate with a spin coating method, and then a film is composited to the single crystal surface with a heating processing technology. According to the provided LAO doped composite film, the doping phase LAO can have a coherent boundary with YBCO, and the YBCO structure is not damaged while a pinning defect is introduced. An external solvent is not added, a system is simple, cost-saving, time for a sintering technology is shorter, and epitaxial growth of YBCO is not hindered while the LAO phase is formed. Je of a sample, doped with 5% of LAO, of the composite film under self-field is about 3 times of that of a pure YBCO film and is about 6 times of that of the pure YBCO film under an external field with 77 K and 1.5 T.

Description

technical field [0001] The invention belongs to the technical field of high-temperature superconducting material preparation, and in particular relates to the preparation technology of a composite thin film doped with high-temperature superconducting coating conductor nanoparticles. Background technique [0002] The second-generation coated superconductor of rare earth barium copper oxide mainly based on YBCO, due to its high irreversible field, high current carrying capacity, low AC loss, and potential price advantage, was recognized as early as the end of the 1980s. The prediction will have a very broad application prospect. However, superconducting materials are mostly used in the environment of an external magnetic field, and their engineering critical current density (J e ) decreases sharply with the increase of the external magnetic field. where the magnetic field and J e There is a certain relationship: J e =H －α . α value means J e The downward trend under the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/45H01B12/00
CPCY02E40/60
Inventor 索红莉徐燕刘敏马麟仪宁
Owner BEIJING UNIV OF TECH
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