Method for preparing gadolinium-barium-copper-oxygen (GdBCO) high-temperature superconducting thin film by using chemical solution method
A technology of high-temperature superconducting thin film and chemical solution method, which is applied in the manufacture/processing of superconductor devices, can solve the problems of complex process, rough surface of the film, and long cycle, and achieve low preparation cost, improved preparation efficiency, and high critical current effect of density
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[0035] 2) Preparation and drying of the gel film:
[0036] The low-fluorine gadolinium barium copper oxygen solution is used as the precursor solution, combined with the dipping method or the spin coating method, on the lanthanum aluminate or strontium titanate single crystal substrate, or on the NiW alloy strip with a buffer layer. Gadolinium-barium-copper-oxygen gel film, followed by drying the obtained gel film under air at a temperature of 80-100°C for 5-20 minutes to obtain a dry film of gadolinium-barium-copper-oxygen;
[0037] 3) Film pretreatment:
[0038] Put the obtained dry gadolinium-barium-copper-oxygen film into a quartz tube sintering furnace. 2 Then raise the temperature in the furnace to 200°C at any rate, then raise the temperature in the furnace to 400-500°C at a rate of 2-20°C / min, and keep it warm for 5-15 minutes; finally cool down naturally with the furnace to room temperature, and stop the humid O 2 gas; during the above pretreatment process, the sin...
Embodiment 1
[0044] This embodiment provides a method for preparing a gadolinium-barium-copper-oxygen high-temperature superconducting thin film by a chemical solution method, and the specific operation steps are as follows:
[0045] 1) Preparation of low-fluorine gadolinium barium copper oxygen solution:
[0046] 1.1 Dissolve gadolinium oxide in aqueous trifluoroacetic acid (in order to prevent the volatilization of trifluoroacetic acid, add water to trifluoroacetic acid, the volume ratio of trifluoroacetic acid to water is 1:1), and heat at 40 ℃ After stirring and dissolving, dry at 70°C to obtain white solid A, then add methanol to white solid A for dilution, stir and dissolve to obtain solution A; wherein, the molar ratio of gadolinium oxide: trifluoroacetic acid: methanol is 0.5:5 :20;
[0047] 1.2 Dissolve barium acetate in the mixed solution of lactic acid and methanol, control the molar ratio of barium acetate: lactic acid: methanol to 1:6:15, stir and dissolve to obtain solution ...
Embodiment 2
[0058] This embodiment provides a method for preparing a gadolinium-barium-copper-oxygen high-temperature superconducting thin film by a chemical solution method, and the specific operation steps are as follows:
[0059] 1) Preparation of low-fluorine gadolinium barium copper oxygen solution;
[0060] 1.1 Dissolve gadolinium acetate in aqueous trifluoroacetic acid (in order to prevent the volatilization of trifluoroacetic acid, add water to trifluoroacetic acid, the volume ratio of trifluoroacetic acid to water is 1:2), and heat at 50 ℃ After stirring and dissolving, a white solid A was obtained after drying at 90°C, and acrylic acid was added to the white solid A for dilution, and after stirring and dissolving, a solution A was obtained; the molar ratio of gadolinium acetate: trifluoroacetic acid: acrylic acid was 1:3: 30;
[0061] 1.2 Dissolve barium acetate in a mixed solution of acrylic acid (complexing agent B) and methanol (solution B), control the molar ratio of barium...
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