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Study on Dynamic Change of In Situ Resistance During Sintering Process of YBCO Precursor Film

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Abstract

YBa2Cu3O7-x precursor film prepared by metal-organic deposition method was sintered and oxygenated at 800 °C and 450 °C, respectively. The dynamic in situ resistance data in the sintering process of film was recorded, and the phase composition and transformation of YBa2Cu3O7-x precursor film in treating stages were discussed. In the heating stage of 710–795 °C, the film resistance increased with temperature, which may be explained by that the grains grew larger and internal gaps formed. The tetragonal YBa2Cu3O7-x shows good conductivity at 77–270 K. When temperature ranged from 450 to 800 °C, the tetragonal YBa2Cu3O7-x became very sensitive to oxygen, and the film resistance dropped sharply once oxygen entered. The scanning electron microscope images showed that the oxygen infiltration at 800 °C was more contributing to grain fusion and connectivity. The X-ray diffraction patterns of samples with oxygen infiltration at 800 °C exhibited that the phase transformation to YBa2Cu3O7-x was more fully. The R-T curve and I-V curve were measured by the four-probe method, the transition temperature Tc are 89.8 K and 93.4 K, and the critical current densities Jc are 0.32MA/cm2 and 0.89MA/cm2 (77 K, 0 T) respectively. Tc and Jc curves illustrated that the samples had higher superconductivity, compared with those experienced oxygen infiltrations at 450 °C.

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Funding

The project was funded by the National Training Program of Innovation and Entrepreneurship for Undergraduates (201910145043), China.

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Authors and Affiliations

  1. Institute of Resources and Environmental Engineering, School of Metallurgy, Northeast University, Shenyang, 110004, China

    Yingnan Li, Yichen Gong, Junxu Tao, Baifei Wu & Shumin Zhou

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  1. Yingnan Li
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  2. Yichen Gong
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Correspondence to Yingnan Li.

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Li, Y., Gong, Y., Tao, J. et al. Study on Dynamic Change of In Situ Resistance During Sintering Process of YBCO Precursor Film. J Supercond Nov Magn 33, 1987–1993 (2020). https://doi.org/10.1007/s10948-020-05462-w

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  • DOI: https://doi.org/10.1007/s10948-020-05462-w

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