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    Pyrolysis behaviors dominated by the reaction-diffusion mechanism in the fluorine-free metal-organic decomposition process

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    Type
    Article
    Authors
    Shi, Jiangtao cc
    Zhao, Yue
    Wu, Yue
    Chu, Jingyuan cc
    Tang, Xiao cc
    Li, Xiaohang cc
    Yu, Xin
    Wu, Wei
    Jiang, Guangyu
    Suo, Hongli
    Jin, Zhijian
    KAUST Department
    Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
    Electrical Engineering Program
    Date
    2020
    Embargo End Date
    2022-01-13
    Submitted Date
    2020-08-13
    Permanent link to this record
    http://hdl.handle.net/10754/666893
    
    Metadata
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    Abstract
    Owing to the advantages of its environmentally friendly process and superior high growth rate, the fluorine-free metal-organic decomposition (FF-MOD) is a promising route for the growth of REBa2Cu3O7-δ (REBCO, where RE is Y or other rare-earth elements) superconducting films. In this work, the pyrolysis behaviors dominated by the reaction-diffusion mechanism were investigated. Combining the atomic force microscopy and the nanoindentation analysis, we concluded that the strain generated by decomposition reactions plays a crucial role in defect formation. Due to the smooth release of the strain and enhancement of the mechanical properties, the defect-free film could be obtained under a fast process. However, an inhomogeneous microstructure along the film thickness was always found by cross-section observation, i.e., a dense layer at the top, while a porous layer was found at the bottom, being separated by a clear boundary. Accordingly, the one-dimensional reaction-diffusion model is proposed. In addition, the formation of such laminar structure is associated with different reaction mechanisms, depending on the diffusion of oxygen and evolved gases. Moreover, severe copper segregation was discerned in the dense layer, which would heavily affect the superconducting phase transformation. Remarkably, a high critical current density value exceeding 2 MA cm-2 (77 K, self-field) was achieved in the GdBa2Cu3O7 films grown on the CeO2 buffered technical substrates. This work provides deep insight into the pyrolysis behaviors of the FF-MOD route in view of the fabrication of REBCO superconducting films with high throughput. This journal is
    Citation
    Shi, J., Zhao, Y., Wu, Y., Chu, J., Tang, X., Li, X., … Jin, Z. (2020). Pyrolysis behaviors dominated by the reaction–diffusion mechanism in the fluorine-free metal–organic decomposition process. Journal of Materials Chemistry C, 8(48), 17417–17428. doi:10.1039/d0tc03851b
    Sponsors
    The authors would like to acknowledge the financial support from the Shanghai Committee of Science and Technology, China (Grant No. 19511106900), the Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning, the Instrument Analysis Center of Shanghai JiaoTong University for PPMS measurements, the Center for Advanced Electronic Materials and Devices (AEMD) for SEM observation, and thanks eceshi (www.eceshi.cn) for the nanoindentation analysis.
    Publisher
    Royal Society of Chemistry (RSC)
    Journal
    Journal of Materials Chemistry C
    DOI
    10.1039/d0tc03851b
    Additional Links
    http://xlink.rsc.org/?DOI=D0TC03851B
    ae974a485f413a2113503eed53cd6c53
    10.1039/d0tc03851b
    Scopus Count
    Collections
    Articles; Electrical Engineering Program; Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division

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