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High homogeneity 10 cm long BaTiO3-doped YBa2Cu3O7-δ films by the trifluoroacetate metal-organic deposition process

  • Original Paper: Functional coatings, thin films and membranes (including deposition techniques)
  • Published:
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Abstract

The trifluoroacetate metal-organic deposition (TFA-MOD) is one of the most appealing routes for the growth of high-quality YBa2Cu3O7-δ (YBCO) coated conductors (CCs) due to its advantages of low cost and high efficiency. However, the puzzle of the inhomogeneities in microstructures and superconducting properties of YBCO CCs prepared based on the TFA-MOD route remain still a challenge. In this paper, 10 cm long YBCO films were prepared under different low-pressure conditions. These YBCO films were deposited on buffered Hastelloy C276 tapes using a dip coater. The effect of different ambient pressures on the microstructure and critical current density of YBCO films was investigated. High critical current density (JC) YBCO coated conductors with good homogeneity were obtained. The JC values (77 K, self-field) at different positions along the length direction of YBCO coated conductor were around 3.5–4 MA/cm2. The results showed that only under a suitable pressure the homogeneities of the microstructure and critical current density along the length direction of coated conductor can be greatly improved. The improvement was mainly ascribed to good texture and the absence of impurity phases BaF2 and Ba4Y2O7 in the films.

Highlights

  1. (1)

    Solution-deposited long YBa2Cu3O7-δ CCs with high homogeneity were obtained.

  2. (2)

    Excess water vapor causes formation of Ba4Y2O7 in the YBCO films.

  3. (3)

    Excess water vapor converts orientations of needle-shaped grains from order to disorder.

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Acknowledgements

This work was supported by Project supported by the National Natural Science Foundation of China (Grant no. 51577180), the Joint Fund of National Natural Science Foundation of China (Grant no. U1832131) and the Natural Science Foundation of Hebei Province (Grant no. E2018402097).

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Authors and Affiliations

  1. School of Mathematics and Physics, Hebei University of Engineering, Handan, 056000, China

    Huiliang Zhang & Chunyuan Zhang

  2. Key Laboratory of Applied Superconductivity, Chinese Academy of Sciences, 100190, Beijing, China

    Daxing Huang, Fazhu Ding & Hongwei Gu

  3. Institute of Electrical Engineering, Chinese Academy of Sciences, 100190, Beijing, China

    Daxing Huang, Fazhu Ding & Hongwei Gu

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  1. Huiliang Zhang
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  2. Daxing Huang
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  3. Chunyuan Zhang
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  4. Fazhu Ding
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  5. Hongwei Gu
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Correspondence to Huiliang Zhang, Fazhu Ding or Hongwei Gu.

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Zhang, H., Huang, D., Zhang, C. et al. High homogeneity 10 cm long BaTiO3-doped YBa2Cu3O7-δ films by the trifluoroacetate metal-organic deposition process. J Sol-Gel Sci Technol 96, 297–303 (2020). https://doi.org/10.1007/s10971-020-05367-z

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