Production method of high-temperature superconductive REBCO film

Abstract

The invention provides a production method of a high-temperature superconductive REBCO film. The method comprises the following steps: 1, preparing a fluorine-free precursor solution according to an atom ratio of RE:Ba:Cu of 1:1.75:3; 2, preparing a fluorine-containing precursor solution according to an atom ratio of RE:Ba:Cu of 1:(1.5-2):3; 3, uniformly coating a LaAlO3 substrate with the fluorine-free precursor solution through adopting a spin coating technology, and carrying out heat treatment to obtain a fluorine-free monolayer precursor film; 4, uniformly coating the fluorine-free monolayer precursor film with the fluorine-containing precursor solution through adopting the spin coating technology, and carrying out heat treatment to obtain a fluorine-free / fluorine-containing bilayer precursor film; and 5, carrying out heat treatment on the fluorine-free / fluorine-containing bilayer precursor film to obtain the REBCO superconductive film. The production method is simple, allows the produced high-temperature superconductive REBCO film to have sharp cubic orientation and excellent superconductive performance, and improves the current carrying performance of the high-temperature superconductive REBCO film at 77 K.

Description

technical field [0001] The invention belongs to the technical field of high-temperature superconducting materials, and in particular relates to a preparation method of a high-temperature superconducting REBCO thin film. Background technique [0002] The coated conductor is a multi-layer composite material composed of metal substrate / buffer layer / superconducting layer / protective layer. Due to its excellent current-carrying capacity under high fields, it will be the only hope for high-temperature superconducting materials to truly realize the application of strong electricity in the liquid nitrogen temperature zone. In recent years, it has been the core superconducting material developed by developed countries. At present, REBa is prepared by low-cost chemical solution deposition technology. 2 Cu 3 o y (REBCO) superconducting layer has become one of the research hotspots. [0003] The preparation of high-temperature superconducting REBCO thin films by chemical solution dep...

AI Technical Summary

Problems solved by technology

These two methods have certain defects. The first method contains barium carbonate which is difficult to decompose during the preparation process. Generally, a higher crystallization temperature is required to completely remove it. Residual carbonate will lead to a decrease in the performance of the REBCO superconducting film.

In the second method, the fluorine content will lead to excessive liquid phase formation in the phase formation process, non-oriented nucleation, slow growth, and performance degradation

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