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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AI-Extracted 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 ...
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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.

Application Domain

Technology Topic

Examples

  • Experimental program(3)

Example Embodiment

[0016] Example 1: A-axis oriented YBCO superconducting thick film is grown by liquid phase epitaxy using (110) oriented NGO substrate
[0017] 1) Use BaCO 3 +CuO powder for batching, control the Ba/Cu atomic ratio to 0.6;
[0018] 2) For BaCO 3 +CuO powder is ground, and then calcined at 850°C for 50 hours to sinter into 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 for 20 hours to melt the Ba-Cu-O powder uniformly 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 airflow stable;
[0021] 5) Cool 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 as a growth substrate, a YBCO thick film was grown by liquid phase epitaxy, and the growth time was 3 minutes to obtain a-axis-oriented yttrium barium with a thickness of 10 microns Copper oxide YBCO superconducting thick film.

Example Embodiment

[0023] Example 2: Liquid phase epitaxial growth of a-axis oriented YBCO superconducting thick film using (110) oriented NGO substrate
[0024] 1) Use BaCO 3 +CuO powder is mixed, and the Ba/Cu atomic ratio is controlled to 0.6;
[0025] 2) For BaCO 3 +CuO powder is ground and then calcined at 900°C for 45 hours to sinter into 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 for 24 hours to melt the Ba-Cu-O powder uniformly 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 airflow stable;
[0028] 5) Cool 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 substrate, a YBCO thick film was grown by liquid phase epitaxy. The growth time was 4 minutes to obtain a-axis-oriented yttrium barium with a thickness of 13 microns Copper oxide YBCO superconducting thick film.

Example Embodiment

[0030] Example 3: Liquid phase epitaxial growth of a-axis-oriented YBCO superconducting thick film using (110)-oriented NGO substrate
[0031] 1) Use BaCO 3 +CuO powder is mixed, and the Ba/Cu atomic ratio is controlled to 0.6;
[0032] 2) For BaCO 3 +CuO powder is ground, and then calcined at 950°C for 40 hours to sinter 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 for 30 hours to melt the Ba-Cu-O powder uniformly 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 airflow stable;
[0035] 5) Cool 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 substrate, a YBCO thick film was grown by liquid phase epitaxy, and the growth time was 5 minutes to obtain a-axis yttrium barium with a thickness of 17 microns Copper oxide YBCO superconducting thick film.
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