Preparation method of nanosilver-doped yttrium barium copper oxide film

Abstract

The invention discloses a preparation method of a nanosilver-doped yttrium barium copper oxide film, which comprises the following steps: 1. preparing a nanosilver sol by electrochemical reaction, adding the nanosilver sol into a yttrium barium copper oxide precursor liquid to prepare a precursor sol; 2. evenly applying the precursor sol on a CeO2 / YSZ / Y2O3 / NiW substrate to obtain a wet film; 3. carrying out low-temperature pyrolysis to obtain a precursor film; 4. crystallizing to obtain the nanosilver-doped yttrium barium copper oxide film. The electrochemical reaction for preparing nanosilver particles does not need dispersant, reducer or other complex compounds, and can easily obtain the high-purity impurity-free nanosilver sol; the nanosilver particles in the prepared precursor sol aredistributed uniformly, do not aggregate, and have high stability, and the dimension of the nanosilver particles is smaller than 20 nm; the nanosilver-doped yttrium barium copper oxide film obtained by applying the precursor sol has the advantages of low phase formation temperature and uniform nucleation, and has a superconductive layer which is 400-600nm thick and has excellent superconductivity.

Description

technical field [0001] The invention belongs to the technical field of thin film materials, and in particular relates to a preparation method of a nano-silver doped yttrium barium copper oxide film. Background technique [0002] Coated conductors have become one of the hotspots in the research of practical high-temperature superconducting materials due to their superior high-field performance at 77K. People have successfully developed the chemical solution deposition technology to prepare YBCO superconducting film, among which the nucleation and grain dominant orientation growth in the crystallization process are the focus of research. In the process of preparing coated conductors by using chemical solution deposition technology, nano-silver is added to the superconducting film, which is beneficial to reduce the phase formation temperature of the superconducting layer and promote its uniform nucleation and growth. [0003] In the preparation process of REBCO (RE stands for ...

AI Technical Summary

Problems solved by technology

At present, the nano-silver particles doped in the coated conductor are all prepared by mechanical ball milling process or chemical reduction method. The silver particles prepared by mechanical ball milling process are irregular in shape and large in particle size, resulting in instability of the silver-doped precursor sol; and Nano-silver particles prepared by chemical reduction method are easy to introduce impurities into the colloid, which reduces the performance of the prepared superconducting layer

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