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- W1967520110 abstract "Abstract To understand the effect of Y2BaCuO5 (Y211)/YBa2Cu3O7−y (Y123) interfaces on the oxygen diffusion in single grain YBa2Cu3O7−y superconductors, single grain Y123 superconductors with 0.05 and 0.3 moles of Y2O3 additions were fabricated by a top-seeded melt growth (TSMG) process. Y123 compacts with Y2O3 additions were subjected to melt growth heating cycles with a cooling rate of 1 °C/h through a peritectic temperature (1015 °C) and then annealed at 450 °C for 200 h in flowing oxygen. The superconducting temperature (Tc) and critical current density (Jc) were estimated for the three different regions (top surface (s), intermediate (i) and center (c)) of samples. The amount of Y211/Y123 interface area in single grain Y123 superconductors was successfully controlled by Y2O3 additions. The Tc values of s regions were higher than those of i and c regions, which indicates the presence of more oxygen at the sample surfaces. In addition, the Tc values of i and c regions of the Y123 sample with 0.3 mole Y2O3 addition were higher than those of the same regions of the Y123 sample with 0.05 mole Y2O3 addition due to the promoted oxygen diffusion through Y211/Y123 interfaces and other related defects. In spite of the promoted oxygen diffusion by Y2O3 addition, the large Tc difference among the regions still existed, which suggests sluggish oxygen diffusion into single Y123 grains." @default.
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- W1967520110 date "2011-11-01" @default.
- W1967520110 modified "2023-10-18" @default.
- W1967520110 title "Effects of Y2O3 additions on the oxygen diffusion in top-seeded melt growth processed YBa2Cu3O7−y superconductors" @default.
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- W1967520110 doi "https://doi.org/10.1016/j.physc.2011.05.078" @default.
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