Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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Refinement of Gd2O3 inclusions in the GdBa2Cu3O7-δ films fabricated by the RCE-DR process

  • Park, I. (Department of Materials Science & Engineering and Research Institute of Advanced Materials (RIAM), Seoul National University) ;
  • Oh, W.J. (Department of Materials Science & Engineering and Research Institute of Advanced Materials (RIAM), Seoul National University) ;
  • Lee, J.H. (Superconductor, Nano & Advanced Materials Corporation) ;
  • Moon, S.H. (Superconductor, Nano & Advanced Materials Corporation) ;
  • Yoo, S.I. (Department of Materials Science & Engineering and Research Institute of Advanced Materials (RIAM), Seoul National University)
  • Received : 2018.12.17
  • Accepted : 2018.12.30
  • Published : 2018.12.31
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Abstract

To improve in-field critical current densities ($J_c$) of $GdBa_2Cu_3O_{7-{\delta}}$ (GdBCO) coated conductors(CCs) fabricated by the reactive co-evaporation by deposition and reaction (RCE-DR) process, employing the nominal composition of Gd:Ba:Cu=1:1:2.5, we tried to refine the $Gd_2O_3$ particles trapped in the GdBCO superconducting matrix. For this purpose, we carefully selected the processing conditions on the stability phase diagram of GdBCO for this composition. By lowering the growth temperature of $Gd_2O_3$ in the liquid, we could refine the average particle size of $Gd_2O_3$ particles trapped in the GdBCO matrix and also achieve the zero-resistive transition temperatures ($T_{c,zero}$) of 92.3~94.2 K. Unfortunately, however, it was unsuccessful to achieve enhanced in-field $J_c$ values from these samples because of an air-contamination of the amorphous precursor film before its conversion into crystalline GdBCO film, suggesting that any exposure of the amorphous precursor film to air is fatal in obtaining high performance GdBCO CCs via the RCE-DR process.

Keywords

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Fig. 1. The schematic of reel-to-reel tube furnace apparatus.

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Fig. 2. The stability phase diagram of GdBCO for the nominal composition of Gd:Ba:Cu = 1:1:2.5 [15] with different fabrication process paths.

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Fig. 3. The XRD patterns of the sample fabricated by RCE-DR in SuNAM (a), and the samples after growth at (b) 861°C, (c) 851°C, (d) 841°C, (e) 831°C, and (f) 821°C in 30 mTorr O2 for the growth of Gd2O3 and at 861°C in the PO2 of 150 mTorr for the conversion into GdBCO.

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Fig. 4. The ρ-T curves for the GdBCO CC fabricated by RCE-DR in SuNAM (a), and also for GdBCO films grown at 861°C in 150 mTorr after the heat-treatment at (b) 861°C, (c) 851°C, (d) 841°C, (e) 831°C, and (f) 821°C in 30 mTorr for the size control of Gd2O3 particles.

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Fig. 5. Z-contrast STEM micrographs of the sample (a) 861-861, (b) 841-861, and (c) 821-861, (1) Gd, (2) Ba, and (3) Cu elements spectral images analysed for the its samples, respectively.

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Fig. 6. Z-contrast STEM micrograph of the sample (a) and (b) 821-861, (c) Gd, (d) Ba, and (e) Cu elements spectral images analysed for the sample 821-861.

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