Method for preparing high temperature superconducting thin film by chemical process

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...

AI Technical Summary

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.

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