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

Haigun Lee, Haiwoong Park

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2 Citations (Scopus)

Abstract

This paper presents a study on the feasibility of concurrent synthesis and melt-processing of Yttrium Barium Copper Oxide-0.325 Ag (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 (PO2 = 0.28 kPa), and thus direct formation of orthorhombic Y123-Ag from BaCuO 2.5. The highest critical current densities, Jc (transport) at 77 K and Jc (magnetization) estimated from the magnetization hysteresis loop were 4.0 × 103 and 1.2 × 105 A/cm2, respectively.

Original languageEnglish
Pages (from-to)6841-6847
Number of pages7
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume42
Issue number11
Publication statusPublished - 2003 Nov 1
Externally publishedYes

Fingerprint

Yttrium barium copper oxides
barium oxides
Oxide superconductors
copper oxides
yttrium
Partial pressure
Superconducting materials
partial pressure
Magnetization
Silver
silver
magnetization
Oxygen
oxygen
synthesis
Hysteresis loops
Processing
critical current
heat treatment
hysteresis

Keywords

  • BaCuO
  • Orthorhombic phase
  • Oxygen partial pressure
  • Tetragonal phase
  • Yttrium Barium Copper Oxide-0.325Ag (Y123-Ag) superconductor

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

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abstract = "This paper presents a study on the feasibility of concurrent synthesis and melt-processing of Yttrium Barium Copper Oxide-0.325 Ag (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 (PO2 = 0.28 kPa), and thus direct formation of orthorhombic Y123-Ag from BaCuO 2.5. The highest critical current densities, Jc (transport) at 77 K and Jc (magnetization) estimated from the magnetization hysteresis loop were 4.0 × 103 and 1.2 × 105 A/cm2, respectively.",
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AB - This paper presents a study on the feasibility of concurrent synthesis and melt-processing of Yttrium Barium Copper Oxide-0.325 Ag (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 (PO2 = 0.28 kPa), and thus direct formation of orthorhombic Y123-Ag from BaCuO 2.5. The highest critical current densities, Jc (transport) at 77 K and Jc (magnetization) estimated from the magnetization hysteresis loop were 4.0 × 103 and 1.2 × 105 A/cm2, respectively.

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