Preparation of high performance YGdBCO films by low fluorine TFA-MOD process
| Autor: | Qi Zou, Hua Zhang, Taiguang Li, Hongjing Shang, Xu Wenjuan, Daxing Huang, Fazhu Ding, Hongwei Gu, Dong Zebin |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Scanning electron microscope Analytical chemistry Energy-dispersive X-ray spectroscopy 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Microstructure 01 natural sciences 0104 chemical sciences law.invention Volumetric flow rate Geochemistry and Petrology law Impurity Phase (matter) Texture (crystalline) Crystallization 0210 nano-technology |
| Zdroj: | Journal of Rare Earths. 38:755-762 |
| ISSN: | 1002-0721 |
| DOI: | 10.1016/j.jre.2019.11.002 |
| Popis: | YBCO films doped with different contents of gadolinium (Gd) were prepared by the low-fluorine (low-F) trifluoroacetate metal-organic deposition (MOD) method. The effects of flow rate and holding time of the firing (crystallization) stage on the superconducting properties of YxGd1–xBa2Cu3O7–δ (YGdBCO) films were investigated. The phase formation and texture were characterized by the X-ray diffraction (XRD), which indicate that severe degradation of the microstructure will be induced with the inappropriate flow rate. The surface morphology and element distribution were investigated by the scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The results show that increasing the holding time of the firing stage is effective for the further decomposition of residual impurity phase on the surface. The mechanisms of the phase and surface evolution are also discussed. Finally, a high critical current density (Jc) value of 5.4 MA/cm2 was achieved in the Y0.9Gd0.1BCO film fabricated by the cooperative control of the flow rate and holding time of the firing stage, which are contributed to the formation of excellent texture, homogeneous microstructure and dense surface of the YGdBCO films. |
| Databáze: | OpenAIRE |
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