Preparation Of SmBCO Superconducting Film By Fluorite-Free Polymer-Assisted Metal Organic Deposition

In this thesis, the development, application and classification of superconducting materials were summarized.The development and fabrication methods of REBCO high temperature superconducting films were introduced.The structure, performance parameters were presented with the research goal and content.SmBa2Cu3O7-x(SmBCO)films have been synthesized on single crystal substrates of LaA103by using a fluorite-free PA-MOD method. First the whole treating process of SmBCO film fabrication has been introduced.The anneal process of using a fluorite-free PA-MOD method to synthesize SmBCO thin film was investigated. The optimal epitaxial growth temperature was790℃, and melt-partially mehod was proposed to optimize SmBCO film process. The SmBCO thin films have been investigated by x-ray diffraction (XRD), scanning electron microscopy (SEM) and PPMS method. The results showed that exhibited high c-axis orientation, smooth, dense and crack-free surface. The PPMS test results show that the SmBCO samples of the superconducting critical temperature T c of about91K.The effect of slight Co element doping at Cu site (nominal doped level was0.001,0.002and0.003) doping on critical current densities of SmBCO films in high magnetic field was also investigated. SmBCO films with slight Co element doping have been synthesized by using the optimized fluorite-free MOD method. The SmBCO thin films have been investigated by x-ray diffraction (XRD), scanning electron microscopy (SEM) and PPMS method. Research results show that SmBCO films with slight Co element doping displays smooth and dense surface morphology.In the last part of the thesis, a number of spin-coating preparation of SmBCO double-thick film, research of SmBCO double-layer thick film texture and microstructure, the bilayer membrane thickness of243nm.