Method for preparing high temperature superconducting thin film by chemical process

A high-temperature superconducting thin film, chemical solution method, applied in the use of superconducting elements, superconducting devices, superconducting/high-conducting conductors, etc. problem, to achieve the effect of increasing the critical current density

Active Publication Date: 2010-06-23
GRIMAT ENG INST CO LTD
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Problems solved by technology

The high-temperature superconducting film prepared by the post-processing method is generally a polycrystalline film, with a low Jc and a rough surface, which cannot meet the requirements for making high-temperature superconducting electronic devices.

Method used

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  • Method for preparing high temperature superconducting thin film by chemical process
  • Method for preparing high temperature superconducting thin film by chemical process

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Embodiment 1

[0023] Y(CH 3 COO) 3 , Sm(CH 3 COO) 3 , Ba(CH 3 COO) 2 and Cu(CH 3 COO) 2 mixed, where Sm(CH 3 COO) 3 accounted for Y(CH 3 COO) 3 The molar content of the solution is 5%, and it is completely dissolved in deionized water containing an equivalent amount of trifluoroacetic acid at room temperature to form a solution, and the concentration of trifluoroacetic acid in the deionized water is 25 mol%.

[0024] The prepared solution was stirred on a magnetic stirrer for 2 hours to improve the uniformity of the solution, and then the solution was vacuum-dried with a rotary evaporator to form a blue gel, then added methanol and stirred to dissolve the gel completely, and then vacuum-dried with a rotary evaporator again It is a blue gel, and methanol is added at the end to make a precursor solution with a total concentration of Y, Sm, Ba and Cu metal ions of 1.5mol / L.

[0025] The prepared precursor solution was spin-coated on LaAlO at 3000 rpm 3 On a single crystal substrate...

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Abstract

The invention provides a method for preparing high temperature superconducting thin film by chemical process. The method comprises the following steps: firstly preparing a precursor solution, by mixing Y(CH3COO)3, RE(CH3COO)3, Ba(CH3COO)2 and Cu(CH3COO)2 with ratio of (Y+RE) to Ba to Cu equaling to 1:2:3 (wherein RE is Nd, Sm, Eu, Gd and Dy) and dissolving in 20-30 mol percent aqueous trifluoroacetic acid solution; stirring to be uniform, performing vacuum drying by evaporation to the solvent to obtain gel; then adding methanol, stirring to be uniform, performing drying by evaporation to the solvent to obtain gel; then adding proper amount of methanol to prepare the precursor solution with the total concentration of metal ions of Y, RE, Ba and Cu being 0.8-3.0mol/L; then coating the precursor solution on a substrate; performing low temperature heat treatment at 400-410 DEG C to the coated thin film to decompose trifluoroacetic acid salt; and finally performing high temperature heat treatment at 800-850 DEG C and annealing process at 490-510 DEG C to form YBCO thin film doped with rare-earth element.

Description

technical field [0001] The invention relates to a chemical solution preparation method of a high-temperature superconducting thin film, in particular to preparing a rare earth element-doped yttrium barium copper oxide (YBCO) thin film by using a trifluoroacetate-metal organic method (TFA-MOD). Background technique [0002] Superconducting materials can be prepared in different forms according to different application fields: film, block, wire (strip). For superconducting thin films, in the current most important high-temperature superconducting system, BiSrCaCuO (BSCCO), TlBa 2 T of CaCuO(TBCCO) and HgBaCaCuO(HBCCO) system C Although the (transition temperature) is relatively high (Tc≥110K), due to the slow progress in the research on the in-situ growth of BSCCO, TBCCO and HBCCO high-temperature superconducting thin films, at present, BSCCO, TBCCO and HBCCO superconducting thin films with Tc≥110K are still mainly used after Treatment method preparation. The high-temperatu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B12/06H01B13/00
CPCY02E40/642Y02E40/60
Inventor 丁发柱古宏伟李弢
Owner GRIMAT ENG INST CO LTD
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