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Method for preparing crack-free YBCO liquid phase epitaxial film

A liquid phase epitaxy and crack-free technology, which is applied in liquid phase epitaxy layer growth, chemical instruments and methods, single crystal growth, etc., can solve problems such as large mismatch, cracks, unfavorable design and development of superconducting devices, etc.

Inactive Publication Date: 2014-10-22
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the YBCO / MgO seed film, the mismatch between the MgO substrate and the YBCO thin film is very large; for the NGO seed film, the induced growth of the YBCO superconducting film usually has dense cracks, which is very unfavorable for the design and operation of superconducting devices. research and development
In the previous liquid phase epitaxy method, because it is difficult to obtain extremely low growth driving force, the YBCO superconducting film epitaxially grown on YBCO / LAO has very obvious cracks

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This embodiment provides a method for preparing a crack-free YBCO liquid phase epitaxy film, comprising the following steps:

[0029] 1. According to the molar ratio of Ba: Cu = 0.6, BaCO 3 Powder and CuO powder are mixed, put into a ball mill jar, add absolute ethanol or water for wet grinding to obtain BaCO 3 and CuO mixed slurry, the wet grinding time is 3 hours.

[0030] 2. The BaCO obtained in step 1 3 The mixed slurry with CuO was heated and dried at 105°C to obtain BaCO 3 and CuO mixed powder.

[0031] 3. The BaCO obtained in step 2 3 The mixed powder with CuO was sintered in air at 900°C for 48 hours to obtain the precursor powder of Ba-Cu-O phase.

[0032] 4. Add the Ba-Cu-O precursor powder to the holding Y in the crystal growth furnace 2 o 3 In the crucible of the material, the Ba-Cu-O precursor powder was added to be flush with the upper edge of the crucible.

[0033] 5. Mix the Ba-Cu-O precursor powder and Y 2 o 3 The crucible of the material is h...

Embodiment 2

[0039] This embodiment provides a method for preparing a crack-free YBCO liquid phase epitaxy film, comprising the following steps:

[0040] 1. According to the molar ratio of Ba: Cu = 0.4, BaCO 3 Powder and CuO powder are mixed, put into a ball mill jar, add absolute ethanol or water for wet grinding to obtain BaCO 3 and CuO mixed slurry, the wet grinding time is 2 hours.

[0041] 2. The BaCO obtained in step 1 3The mixed slurry with CuO was heated and dried at 105°C to obtain BaCO 3 and CuO mixed powder.

[0042] 3. The BaCO obtained in step 2 3 The mixed powder with CuO was sintered in air at 890°C for 50 hours to obtain the precursor powder of Ba-Cu-O phase.

[0043] 4. Add the Ba-Cu-O precursor powder to the holding Y in the crystal growth furnace 2 o 3 In the crucible of the material, the Ba-Cu-O precursor powder was added to be flush with the upper edge of the crucible.

[0044] 5. Mix the Ba-Cu-O precursor powder and Y 2 o 3 The crucible of the material was h...

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Abstract

The invention discloses a method for preparing a crack-free YBCO liquid phase epitaxial film. The method comprises the following steps of a) preparing Ba-Cu-O powder; b) sintering to obtain Ba-Cu-O precursor powder; c) adding Ba-Cu-O precursor powder to a Y2O3 crucible in a crystal growth furnace and heating to a first temperature and carrying out thermal insulation to obtain a Y-Ba-Cu-O solution; d) adding Ba-Cu-O precursor powder in the solution, continuously carrying out thermal insulation at the first temperature, and then cooling the solution to a second temperature; and e) inserting the YBCO / LAO film which serves as a seed crystal material into the solution obtained in the step d) and growing into the crack-free YBCO liquid phase epitaxial film. According to the method disclosed by the invention, the YBCO / LAO film is adopted as a seed crystal, by controlling the amount of Ba-Cu-O powder added for the second time and the temperature holding time, the epitaxial growth of the crack-free YBCO superconducting film is realized; and the method is of great significance for the research and development of a high-temperature superconducting device.

Description

technical field [0001] The invention relates to a method for preparing a high-temperature superconducting material, in particular to a method for preparing a crack-free YBCO liquid phase epitaxial film. Background technique [0002] First discovered in 1911, superconductors have two main properties: zero electrical resistance and complete diamagnetism. These peculiar properties make it have application potential in many fields, for example, in the power industry, superconducting cables can be used to realize lossless power transmission, superconducting motors can break through the limit capacity of conventional generators; superconducting coils made of superconducting The magnet is not only small in size and light in weight, but also has low loss, requires low excitation power, and can obtain a strong magnetic field. However, its extremely low temperature greatly limits its application, so the development of superconductors with higher critical temperatures has become a hot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/22C30B19/12
Inventor 郭林山王伟崔祥祥姚忻
Owner SHANGHAI JIAO TONG UNIV
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