Method for preparing high critical current density yttrium barium copper oxide superconducting film

Abstract

The invention discloses a method for preparing a yttrium barium copper oxide superconducting film with high critical current density, which comprises the following concrete steps: a, preparing a precursor solution, which is to dissolve yttrium acetate, barium acetate, copper acetate and acetate of an impurity element into propionic acid according to the proportion that the stoichiometric ratio of yttrium: barium: copper: impurity element is 1: 2: 3-X: X (the X is more than or equal to 0.0002 and less than or equal to 0.008) to obtain the precursor solution, and the impurity element is one of Co, Fe, Zn, Ni, and Li; b, adding a polymer material polyvinyl butyral (PVB) into the precursor solution obtained in a step to obtain a coating colloid; c, coating and drying the coating colloid on a substrate to form a film; and d, performing thermal decomposition treatment on the substrate with the film prepared in c step and then imaging thermal treatment to obtain the YBCO superconducting film. The yttrium barium copper oxide superconducting film prepared by the method has high biaxial texture, smooth and compact surface, high critical current density under a magnetic field, low cost, and simple process, and is suitable for mass industrial production.

Description

technical field [0001] The invention relates to a method for preparing a yttrium-barium-copper-oxygen superconducting thin film. Background technique [0002] In recent years, the high-temperature superconducting coated conductor, that is, the second-generation high-temperature superconducting tape, especially the second-generation tape with yttrium barium copper oxide (YBCO) as the superconducting layer, has received worldwide attention due to its potential application prospects. General concern. The second generation of YBCO tape has important applications in superconducting cables, motors, generators, magnetic energy storage and magnetic resonance imaging. The YBCO coated conductor is mainly composed of a metal base band, a buffer layer, a superconducting layer and a protective layer. The current-carrying performance of the coated conductor mainly depends on the ability of the superconducting layer to transmit current. However, the critical current density of the superc...

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Problems solved by technology

However, the impact of the introduction of fluorine on the environment during the entire heat treatment process of the TFA-MOD method cannot be ignored, and the HF gas emitted during the heat treatment process causes the porous surface morphology of the YBCO superconducting film, which will reduce the criticality of the film. current density

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