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Method using NGO monocrystal substrate to prepare a shaft REBCO high temperature superconductor thick film

A single crystal substrate, high temperature superconducting technology, applied in the usage of superconductor elements, single crystal growth, single crystal growth and other directions, can solve the problem of small growth window, it is difficult to obtain pure a-axis film growth window, a-axis REBCO thick film Difficulty in preparation, etc.

Inactive Publication Date: 2015-07-15
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] c-axis REBCO films are easily obtained by liquid phase epitaxy, but a-axis REBCO thick films are quite difficult to prepare in air environment
The main reasons are: on the one hand, the growth window of the a-axis REBCO thick film in the air environment is very small, and it is difficult to obtain the growth window of the pure a-axis film by conventional means; on the other hand, the a-axis film needs Only under the conditions can it have an advantage in the competitive growth with the c-axis film, but in practice it is difficult to achieve a small supersaturation close to the equilibrium state

Method used

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  • Method using NGO monocrystal substrate to prepare a shaft REBCO high temperature superconductor thick film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The method for growing REBCO superconducting thick film by liquid phase epitaxy of the present invention grows YBCO superconducting thick film, and concrete steps are:

[0034] 1. Take BaCO 3 powder and CuO powder for batching to obtain BaCO 3 +CuO powder, BaCO 3 The molar ratio of Ba and Cu in +CuO powder is 0.6.

[0035] Concrete BaCO 3 The amount of powder and CuO powder can be determined according to the YBCO superconducting thick film to be grown, and the BaCO obtained after the batching is completed 3 The molar ratio of Ba and Cu in +CuO powder is 0.6. Among them, BaCO 3 +CuO powder is made of BaCO 3 Powder obtained by mixing powder and CuO powder.

[0036] 2. For the BaCO obtained in step 1 3 +CuO powder for pretreatment, pretreatment includes:

[0037] a. In BaCO 3 + Add absolute ethanol to the CuO powder for wet grinding, and the wet grinding time is set to 3 hours to obtain BaCO 3 +CuO paste.

[0038] b. Dry BaCO 3 +CuO paste.

[0039] 3. Sintering...

Embodiment 2

[0045] The method for growing a REBCO superconducting thick film by liquid phase epitaxy of the present invention grows a SmBCO superconducting thick film, and the specific steps are:

[0046] 1. Take BaCO 3 powder and CuO powder for batching to obtain BaCO 3 +CuO powder, BaCO 3 The molar ratio of Ba and Cu in +CuO powder is 0.6.

[0047] Concrete BaCO 3 The amount of powder and CuO powder can be determined according to the SmBCO superconducting thick film to be grown, and the BaCO obtained after the batching is completed 3 The molar ratio of Ba and Cu in +CuO powder is 0.6. Among them, BaCO 3 +CuO powder is made of BaCO 3 Powder obtained by mixing powder and CuO powder.

[0048] 2. For the BaCO obtained in step 1 3 +CuO powder for pretreatment, pretreatment includes:

[0049] a. In BaCO 3 + Add absolute ethanol to the CuO powder for wet grinding, and the wet grinding time is set to 3 hours to obtain BaCO 3 +CuO paste.

[0050] b. Dry BaCO 3 +CuO paste.

[0051] ...

Embodiment 3

[0056] The method for growing REBCO superconducting thick film by liquid phase epitaxy of the present invention grows YBCO superconducting thick film, and concrete steps are:

[0057] 1. Take BaCO 3 powder and CuO powder for batching to obtain BaCO 3 +CuO powder, BaCO 3 The molar ratio of Ba and Cu in +CuO powder is 0.6.

[0058] Concrete BaCO 3 The amount of powder and CuO powder can be determined according to the YBCO superconducting thick film to be grown, and the BaCO obtained after the batching is completed 3 The molar ratio of Ba and Cu in +CuO powder is 0.6. Among them, BaCO 3 +CuO powder is made of BaCO 3 Powder obtained by mixing powder and CuO powder.

[0059] 2. For the BaCO obtained in step 1 3 +CuO powder for pretreatment, pretreatment includes:

[0060] a. In BaCO 3 +Water was added to CuO powder for wet milling, and the wet milling time was set to 3 hours to obtain BaCO 3 +CuO paste.

[0061] b. Dry BaCO 3 +CuO paste.

[0062] 3. Sintering of pretr...

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Abstract

The invention discloses a method using a NGO monocrystal substrate to prepare an a shaft REBCO high temperature superconductor thick film. The specific steps comprises that the BaCO3 powder and CuO powder are matched to obtain BaCO3 + CuO powder, the BaCO3 + CuO powder is pretreated and sintered to obtain Ba-Cu-O powder, the Ba-Cu-O powder is added into RE2O3 material crucible to be heated to first temperature and warmed to obtain RE-Ba-Cu-O solution, the RE-Ba-Cu-O solution is cooled to second temperature, the surface of the NGO monocyrstal substrate is in contact with the RE-Ba-Cu-O solution, and a top seed crystal pulling method is utilized to perform rheotaxy to grow the REBCO high temperature superconductor thick film. The method controls growth temperature and feasibility of cooling rate epitaxial growth specific orientation RCBCO superconductor thick film to obtain a non-general method for an epitaxy a shaft orientation REBCO superconductor thick film.

Description

technical field [0001] The invention relates to a method for preparing a high-temperature superconducting material, in particular to a method for preparing an a-axis REBCO high-temperature superconducting thick film by using an NGO single crystal substrate. Background technique [0002] Since the discovery of high-temperature superconductors, a large number of crystal workers have devoted themselves to the basic research and preparation of high-quality films. Thanks to REBa 2 Cu 3 o x (referred to as REBCO, RE123, rare earth barium copper oxide, where RE stands for rare earth element) has a superconducting transition temperature Tc higher than the temperature of liquid nitrogen, and it exhibits the Meissner effect and zero resistance in a temperature environment lower than the transition temperature Tc effects etc. Because of these important properties of REBCO high-temperature superconducting materials, REBCO superconducting thick films have many potential applications ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/22C30B19/00C30B19/12H01B12/06
CPCY02E40/642Y02E40/60
Inventor 姚忻郭林山陈媛媛程玲许恒恒彭波南王伟
Owner SHANGHAI JIAOTONG UNIV
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