The role of uranium, with and without irradiation, in the achievement of Jc ≈ 300000 A cm−2 at 77 K in large grain melt-textured Y123

Nano-composite single grain YBa2Cu3O7-δ/Y2Ba4CuBiOybulk superconductors

“…RE-211 particles, however, tend to ripen during the REBa 2 Cu 3 O 7-δ (RE-123) peritectic solidification process [3], and, as a result, refining the size of these inclusions on the nano-scale has generally proved unsuccessful. Weinstein et al [4] have introduced U-containing 300-400 nm particles as second phase inclusions into bulk YBCO. The chemical composition of these Uphase particles has been identified as Y 2 Ba 4 CuUO y [5] and their presence has been demonstrated to contribute significantly to enhanced flux pinning in the bulk material [4,6].…”

“…Weinstein et al [4] have introduced U-containing 300-400 nm particles as second phase inclusions into bulk YBCO. The chemical composition of these Uphase particles has been identified as Y 2 Ba 4 CuUO y [5] and their presence has been demonstrated to contribute significantly to enhanced flux pinning in the bulk material [4,6]. The Y 2 Ba 4 CuUO y phase has subsequently been synthesized separately via a solid state reaction process and introduced into theY-123 superconducting matrix in the form of sub-micron inclusions [7].…”

A non-destructive, non-contact, quality test of critical current for Ag-BiSCCO tape

“…2 shows the effect of a crack. This shows that, in Ag-BiSCCO tapes, as in Y123 TFM's [5], cracks can be easily seen despite the low trappedfield. The physical crack was very narrow.…”

Bulk Superconducting Nano-Composites With High Critical Currents

“…Weinstein et al were the first to report such a phase based on a Y-Ba-U-O composition [3]. They reported that the addition of a small amount of uranium oxide to the YBCO precursor powder resulted in the formation of U-containing second phase inclusions of size 300 nm within the Y-123 superconducting matrix during melt processing [3], [4].…”

“…Weinstein et al were the first to report such a phase based on a Y-Ba-U-O composition [3]. They reported that the addition of a small amount of uranium oxide to the YBCO precursor powder resulted in the formation of U-containing second phase inclusions of size 300 nm within the Y-123 superconducting matrix during melt processing [3], [4]. This phase, which was identified subsequently by Hari Babu et al to be Y Ba CuUO [5] with a cubic, double perovskite crystallographic structure of general formula AA B B O for [6], can be synthesized externally by conventional solid state reaction techniques.…”