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Oxygen atmosphere control preparation method for alpha-axis oriented Yt-Ba-Cu-O superconductive thick film

A technology of yttrium barium copper oxygen and oxygen atmosphere, applied in the field of high temperature superconducting material preparation, can solve problems such as growth and complicated operation, and achieve the effects of simple process, high deposition rate and low cost

Inactive Publication Date: 2007-05-30
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the technologies mastered by the predecessors, it is impossible to grow a pure a-axis thick film in a flux with a Ba / Cu atomic ratio of 3:5, and it is more complicated to change the growth orientation by changing the flux composition.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: Using (110) oriented NGO substrate liquid phase epitaxial growth of a-axis oriented YBCO superconducting thick film

[0017] 1) with BaCO 3 The powder of +CuO is compounded, and the Ba / Cu atomic ratio is controlled to be 0.6;

[0018] 2) to BaCO 3 +CuO powder is ground, then calcined at 850°C for 50 hours, and sintered into a uniform Ba-Cu-O powder;

[0019] 3) Add Ba-Cu-O powder to Y placed in the furnace 2 o 3 In the crucible, heat the furnace to 50K above the peritectic melting temperature of YBCO, and keep it warm for 20 hours to melt the Ba-Cu-O powder evenly to obtain a Y-Ba-Cu-O melt;

[0020] 4) Change the atmosphere in the furnace to a 100% pure oxygen atmosphere, and keep the furnace airtight and the airflow stable;

[0021] 5) cooling the Y-Ba-Cu-O melt to 5K below the peritectic melting temperature of YBCO, as the epitaxial growth temperature;

[0022] 6) Using a single-sided polished (110)-oriented neodymium gallate single crystal substrate...

Embodiment 2

[0023] Example 2: Using (110) oriented NGO substrate liquid phase epitaxial growth of a-axis oriented YBCO superconducting thick film

[0024] 1) with BaCO 3 +CuO powder is mixed, and the Ba / Cu atomic ratio is controlled to be 0.6;

[0025] 2) to BaCO 3 +CuO powder is ground, then calcined at 900°C for 45 hours, and sintered into a uniform Ba-Cu-O powder;

[0026] 3) Add Ba-Cu-O powder to Y placed in the furnace 2 o 3 In the crucible, heat the furnace to 45K above the peritectic melting temperature of YBCO, and keep it warm for 24 hours to melt the Ba-Cu-O powder evenly to obtain a Y-Ba-Cu-O melt;

[0027] 4) Change the atmosphere in the furnace to a 100% pure oxygen atmosphere, and keep the furnace airtight and the airflow stable;

[0028] 5) cooling the Y-Ba-Cu-O melt to 10K below the peritectic melting temperature of YBCO as the epitaxial growth temperature;

[0029] 6) Using a single-sided polished (110)-oriented neodymium gallate single crystal substrate as a growth...

Embodiment 3

[0030] Embodiment 3: Use (110) oriented NGO substrate liquid phase epitaxial growth a-axis oriented YBCO superconducting thick film

[0031] 1) with BaCO 3 +CuO powder is mixed, and the Ba / Cu atomic ratio is controlled to be 0.6;

[0032] 2) to BaCO 3 +CuO powder is ground, then calcined at 950°C for 40 hours, and sintered into a uniform Ba-Cu-O powder;

[0033] 3) Add Ba-Cu-O powder to Y placed in the furnace 2 o 3 In the crucible, heat the furnace to 40K above the peritectic melting temperature of YBCO, and keep it warm for 30 hours to melt the Ba-Cu-O powder evenly to obtain a Y-Ba-Cu-O melt;

[0034] 4) Change the atmosphere in the furnace to a 100% pure oxygen atmosphere, and keep the furnace airtight and the airflow stable;

[0035] 5) cooling the Y-Ba-Cu-O melt to 15K below the peritectic melting temperature of YBCO, as the epitaxial growth temperature;

[0036] 6) Using a single-sided polished (110)-oriented neodymium gallate single crystal substrate as a growth su...

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PUM

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Abstract

The invention discloses an oxygen atmospheric control making method of a-axle oriental YBCO hyperconductive thick film, which is characterized by the following: utilizing liquid-phase epitaxial device to make high-crystal product; allocating Ba-Cu-O powder according to the rate of Ba and Cu at 3: 5; grinding; sintering; placing in the Y2O3 copple to fuse; obtaining Y-Ba-Cu-O flux; changing 100% pure-oxygen atmosphere in the sealed furnace; adjusting flux temperature in the copple lower than YBCO peritectic fusing temperature by 5-20K; obtaining high-quality a-axle YBCO film on the liquid-phase of (110) single-crystal neodymium gallium acid base.

Description

technical field [0001] The invention relates to an oxygen atmosphere control preparation method of an a-axis oriented yttrium-barium-copper-oxygen superconducting thick film. The growth orientation of the thick film is controlled by changing the growth atmosphere, and obtained in a specific melt and a wide temperature range. YBOCO superconducting thick film with a-axis orientation. The invention belongs to the technical field of high-temperature superconducting material preparation. Background technique [0002] In the practical application of High Temperature Superconductor (HTS), it is of great significance to reasonably control the growth orientation of the superconducting layer. For example, when preparing coating materials and superconducting layers in electronic devices, it is necessary to artificially control its orientation. In general, these applications mainly involve YBa 2 Cu 3 o z (abbreviated as YBCO, Yttrium Barium Copper Oxygen) film has two orientations,...

Claims

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Application Information

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IPC IPC(8): C30B17/00C30B29/22C30B29/64H01B12/00C04B35/50C04B35/45C04B35/622
CPCY02E40/64Y02E40/60
Inventor 姚忻蔡衍卿
Owner SHANGHAI JIAO TONG UNIV
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