Yttrium barium copper oxide fluorine-free sol and preparation of high temperature superconducting film

Abstract

The invention discloses a method for preparing yttrium barium copper oxide fluorine-free sol and a high-temperature superconductive membrane. The mol ratio of the following compositions of the fluorine-free sol, namely yttrium acetate to barium acetate or barium hydroxide to copper acetate to diethylenetriamine or ethanolamine or diethanolamine or trolamine to lactic acid to acrylic acid or alpha-methacrylic acid or metacetonic acid to methanol or ethylene glycol monomethyl ether or ethanol, is 1:2:3-4:1.5-5:6-10:6-40:60-360. The method for preparing the superconductive membrane is to adopt different complexing agents to dissolve acetate in a solvent to prepare the yttrium barium copper oxide fluorine-free sol, adopt a crystal pulling method to prepare the fluorine-free sol into a yttrium barium copper oxide gel membrane, perform heat treatment on the gel membrane, and prepare the yttrium barium copper oxide high-temperature superconductive membrane. During preparation of the membrane from the sol, the pyrolysis process is not required; the whole heat treatment time is shortened by approximately 10 hours compared with the prior fluorine-containing technology; and no corrosive HF gas is generated during preparation of the membrane, so that environmental pollution is low.

Description

technical field [0001] The invention belongs to the technical field of microelectronic materials, and relates to a sol for preparing high-temperature superconducting films, in particular to a fluorine-free yttrium-barium-copper-oxygen sol, and the invention also relates to the preparation of yttrium-barium-copper-oxygen high-temperature super method of directing thin films. Background technique [0002] Yttrium barium copper oxide is a high temperature superconducting material that can be applied in the liquid nitrogen temperature zone, and its chemical formula is YBa 2 Cu 3 o 7-δ , abbreviated as YBCO. YBCO high-temperature superconducting thin film has excellent electromagnetic properties, especially under high field, it has a higher critical current density than the first-generation bismuth-based tape. High, precise and sophisticated electronic devices, such as superconducting quantum interferometer (SQUID), Josephson junctions, superconducting coupled antenna, superc...

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Problems solved by technology

However, the trifluoroacetate-metal-organic deposition method uses fluorine-containing raw materials in the process of preparing YBCO thin films, and a large amount of corrosive hydrofluoric acid (HF) gas will be generated during the thermal decomposition of the gel film, which seriously affects the final The surface quality of the film, and its thermal decomposition time is as long as ten or even tens of hours; although the macromolecular metal butyrate method eliminates BaCO 3 However, due to the complexity of the evolution of the barium-containing phase in the YBCO film preparation process, the thermal decomposition time required to obtain a smooth YBCO film is as long as ten or even tens of hours.

If YBCO thick film needs to be prepared, the process of "coating-thermal decomposition" needs to be repeated many times, so the heat treatment time for preparing YBCO thick film by the above two methods will be longer, which not only reduces the preparation efficiency of YBCO superconducting thin film , and waste energy

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