Nano particle doped REBCO film and preparation method thereof
A nanoparticle and thin film technology, which is applied in the field of high-temperature superconducting material preparation, can solve the problems of high price, achieve low cost, increase critical current density, and expand the application field
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Embodiment 1
[0029] 1) Dissolve 0.01mol yttrium acetate, 0.02mol barium acetate and 0.03mol copper acetate in deionized water, and then add and Cu 2+ The amount ratio of ionic substance is 1:2.3 after trifluoroacetic acid, react in 50°C water bath for 3 hours; finally evaporate and concentrate at 50°C to obtain blue transparent colloidal liquid, dilute with methanol to obtain 1.5mol / L YBCO precursor solution; add 0.0006mol of SnCl to the prepared YBCO precursor solution 4 , after being fully dissolved, a doped YBCO precursor solution is obtained;
[0030] 2) Coating the YBCO precursor solution onto the LAO substrate by spin coating method to obtain a wet film, the coating rotation speed is 4000 rpm, and the coating time is 1 minute;
[0031] 3) Pre-fire the wet film in wet oxygen below 400°C at low temperature to obtain the precursor amorphous film, wherein the temperature rise rate from room temperature to 200°C is 135°C / hour, and the temperature rise rate between 200°C and 250°C is 3.5°...
Embodiment 2
[0035] 1) Dissolve 0.005mol gadolinium acetate, 0.01mol barium acetate and 0.015mol copper acetate in deionized water, and then add and Cu 2+ The ratio of the amount of ionic substances to trifluoroacetic acid is 1:2.4, react in a water bath at 50°C for 3 hours; finally evaporate and concentrate at 50°C to obtain a blue transparent colloidal liquid, dilute with methanol to obtain 1.5mol / L GdBCO precursor solution; add 0.0003mol of SnCl to the prepared GdBCO precursor solution 4 , after being fully dissolved, a doped GdBCO precursor solution is obtained;
[0036] 2) Coating the doped GdBCO precursor solution onto the LAO substrate by spin coating method to obtain a wet film, the coating rotation speed is 4000 rpm, and the coating time is 2 minutes;
[0037] 3) The wet film is pre-fired at a low temperature in wet oxygen below 400°C to obtain a precursor amorphous film, and the specific sintering process is the same as in Example 1;
[0038] 4) Incubate the precursor amorphous...
Embodiment 3
[0041] 1) Dissolve 0.0025mol of ytterbium acetate, 0.0025mol of yttrium acetate, 0.01mol of barium acetate and 0.015mol of copper acetate in deionized water, then add and Cu 2+ The ratio of the amount of ionic substances to trifluoroacetic acid was 1:2.3, and then reacted in a water bath at 50°C for 3 hours; finally evaporated and concentrated at 50°C to obtain a blue transparent colloidal liquid, which was diluted with methanol to obtain 1.5mol / L Yb 0.5 Y 0.5 BCO precursor solution; 0.0003mol of TaCl 5 Dissolve in anhydrous methanol, after fully dissolved, add to Yb 0.5 Y 0.5 In the BCO precursor solution, the doped Yb 0.5 Y 0.5 BCO precursor solution;
[0042] 2) Spin-coating the doped Yb 0.5 Y 0.5 The BCO precursor solution is coated on the STO substrate to obtain a wet film, the coating rotation speed is 4500 rpm, and the coating time is 2 minutes;
[0043] 3) sintering process is identical with the step 3) of embodiment 1;
[0044] 4) sintering process is identi...
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