研究目的
Investigating the influence of Ba2+ consumption and intermediate dwelling during processing of YBa2Cu3O7 nanocomposite films to improve critical current densities (Jc) and superconducting properties.
研究成果
The introduction of an intermediate dwelling step at 650°C improved the YBCO texture and reduced secondary phases, leading to higher critical current densities. The addition of preformed ZrO2 nanocrystals delayed the YBCO nucleation but did not degrade the growth, resulting in improved superconducting properties.
研究不足
The study is limited to films on (100) LaAlO3 substrates. The transfer of these results to textured Ni-W tape or polycrystalline Hastelloy tape with oxide buffer layers presents challenges due to differences in growth rates and surface roughness.
1：Experimental Design and Method Selection:
The study involved the preparation of YBCO precursor solutions with a reduction in fluorine content and the addition of preformed ZrO2 nanocrystals. The influence of an intermediate dwelling step during thermal processing was investigated to understand its effect on YBCO nucleation and growth.
2：Sample Selection and Data Sources:
(100) LaAlO3 substrates were spin-coated with the precursor solutions and pyrolyzed. The films were then subjected to high-temperature thermal treatment with or without an intermediate dwelling step.
3：List of Experimental Equipment and Materials:
Equipment included a Bruker D4 diffractometer for XRD, FEI Nova 600 Nanolab Dual Beam FIB-SEM for SEM images, and a JEOL JEM-2200FS TEM for HRTEM and HAADF-STEM images.
4：Experimental Procedures and Operational Workflow:
The pyrolyzed films were processed at 800°C with or without an intermediate dwelling step at 600, 650, or 700°C. The films were then annealed to convert the tetragonal YBCO phase to the superconducting orthorhombic phase.
5：Data Analysis Methods:
The growth morphology and structure were examined via XRD, SEM, and TEM. The superconducting properties were determined inductively and via transport measurements.
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