Synthesis of Melted Yttrium Barium Copper Oxide-0.325Ag Superconductors Contained in a Solid Silver Cladding at Reduced Oxygen Partial Pressures

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概要

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• This paper presents a study on the feasibility of concurrent synthesis and melt-processing of Yttrium Barium Copper Oxide-0.325Ag (Y123-Ag) superconductor by thermo-mechanical processing of the silver-clad precursor containing BaCuO2.5 at reduced oxygen partial pressures. At 950–955°C the melted Y123-Ag superconductor was contained in a solid silver cladding which melted at 960–965°C. After 15 min at 950–965°C and oxygen partial pressures of 0.28 and 0.55 kPa, melted orthorhombic Y123-Ag formed. On extending the heat-treatment from 15 to 30 min, the orthorhombic Y123-Ag changed to tetragonal Y123-Ag which was supported directly by a series of rapid-heat, soak, and rapid-cool experiments at 950°C ($P_{\text{O2}}=0.28$ kPa), and thus direct formation of orthorhombic Y123-Ag from BaCuO2.5. The highest critical current densities, $J_{\text{c}}$ (transport) at 77 K and $J_{\text{c}}$ (magnetization) estimated from the magnetization hysteresis loop were $4.0\times 10^{3}$ and $1.2\times 10^{5}$ A/cm2, respectively.

• 2003-11-15

著者

• Lee Haigun

  Francis Bitter Magnet Laboratory, M.I.T., Cambridge, MA 02139, USA

• Park Haiwoong

  Department of Materials Engineering, Korea University of Technology and Education, Chonan 330-860, Korea

関連論文

• Synthesis of Melted Yttrium Barium Copper Oxide-0.325Ag Superconductors Contained in a Solid Silver Cladding at Reduced Oxygen Partial Pressures

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