Preparation method of Bi-2212 superconducting thin film

Abstract

The invention discloses a preparation method of a Bi-2212 superconducting thin film. The preparation method comprises the following steps: 1, mixing Bi2212 powder with glacial acetic acid, and heating and refluxing while stirring; 2, adding propionic acid into the acetate solution, and stirring; 3, coating a pure silver substrate witha film-making precursor solution, and drying and pre-decomposing the film-making precursor solution; and 4, performing phase formation and partial melting heat treatment on a pre-decomposed Bi2212 thin film to obtain the Bi2212 superconducting thin film. The Bi2212 superconducting thin film can be obtained by mixing the Bi2212 powder with glacial acetic acid, adding propionic acid as a stabilizer and then coating the film-making precursor solution and then carrying out phase formation and partial melting heat treatment, the thin film is high in density and good in grain connectivity, the thickness of the thin film can be regulated and controlled by controlling the concentration of the precursor solution and the coating frequency, and the thickness of the thin film can be regulated and controlled by controlling the coating frequency. Release substances in the processes of pretreatment, phase forming heat treatment and partial melting heat treatment are only carbon dioxide and water, so the environmental adaptability is good.

Description

technical field [0001] The invention belongs to the technical field of high-temperature superconducting material preparation, and in particular relates to a method for preparing a Bi-2212 superconducting thin film. Background technique [0002] Bi 2 Sr 2 CaCu 2 o x (abbreviated as Bi2212) high-temperature superconductor is one of the most important branches of high-temperature superconducting materials. Due to the irreplaceable advantages of Bi-2212 superconducting materials in high-field magnet systems, research on this material in developed countries such as the United States and Japan is very important. Difficult to pay attention to. [0003] The isotropic Bi2212 round wire is mainly used in strong electricity, such as the preparation of ultra-high magnetic field magnets, cables and energy storage. At present, the powder-in-tube method (PIT) is the mainstream technology for preparing Bi-based wire strips, and the wires prepared by this technology have reached the pra...

AI Technical Summary

Problems solved by technology

[0004] Anisotropic Bi2212 superconducting thin films can be used in superconducting fields, such as superconducting microwaves, superconducting antennas and superconducting computers. The preparation methods mainly include physical magnetron sputtering and pulsed laser deposition techniques. The advantages The prepared film has high density, few defects, and strong current-carrying capacity. The disadvantage is that it requires a high-vacuum environment, high equipment costs and maintenance costs, and requires high-quality targets; chemical methods mainly include sol-gel technology, Chemical vapor deposition technology and metal organic salt chemical vapor deposition technology, etc., the preparation process of chemical method is relatively simple, the requirements for equipment are low, and the thickness is controllable. The disadvantage is that the quality of the prepared film is poor and the stability is poor.