Properties and chemical stability of hot-rolled Ag(7 at. % Cu)-sheathed Bi 2 Sr 2 Ca 0.64 Cu 1.64 O x powder-in-tube tapes

J. Guo, J. A. Lewis, K. C. Goretta, Justin Schwartz

Research output: Contribution to journalArticle

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Abstract

Bi 2 Sr 2 Ca 0.64 Cu 1.64 O x (nominally Bi2212) powders were fabricated into powder-in-tube Ag- and Ag(7 at. % Cu)-sheathed tapes by cold and hot rolling to investigate the effects of sheath composition and rolling conditions on their microstructural development and superconducting properties. Bi2212 tapes with Ag(Cu) sheaths exhibited improved grain alignment and interfacial uniformity, as well as enhanced formation of the Bi-free phase (≊Sr 7.5 Ca 6.5 Cu 14 O x ), relative to the Ag-sheathed specimens. The hot-rolled Ag(Cu)-sheathed tapes displayed superior critical current densities (J c ), where magnetization J cm =1.5×10 6 (H∥c) and 4.6×10 5 A/cm 2 (H⊥c) at T=5 K, H=1 T. Correspondingly, these specimens had transport critical current densities (J ct ) of 6.7×10 4 A/cm 2 (H∥c) and 5.4×10 4 A/cm 2 (H⊥c) at T=4.2 K, H=0 T and 2.2×10 4 A/cm 2 (H∥c) and 3.0×10 4 A/cm 2 (H⊥c) at T=4.2 K, H=14 T. The chemical stability of the Ag(Cu) sheath regions during the partial melting process was also studied. Rapid oxidation of copper produced Cu 2 O precipitates in the sheath at 885 °C, and subsequently a Cu 2 O-free zone developed near the core/sheath interface. A theoretical analysis of Cu 2 O precipitate formation and decomposition during thermal processing is presented.

Original languageEnglish (US)
Pages (from-to)4596-4607
Number of pages12
JournalJournal of Applied Physics
Volume78
Issue number7
DOIs
StatePublished - Dec 1 1995

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sheaths
tapes
tubes
precipitates
critical current
current density
cold rolling
thermal decomposition
alignment
melting
copper
magnetization
oxidation

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

@article{d7b45c5f655643fdba33865c539308f3,
title = "Properties and chemical stability of hot-rolled Ag(7 at. {\%} Cu)-sheathed Bi 2 Sr 2 Ca 0.64 Cu 1.64 O x powder-in-tube tapes",
abstract = "Bi 2 Sr 2 Ca 0.64 Cu 1.64 O x (nominally Bi2212) powders were fabricated into powder-in-tube Ag- and Ag(7 at. {\%} Cu)-sheathed tapes by cold and hot rolling to investigate the effects of sheath composition and rolling conditions on their microstructural development and superconducting properties. Bi2212 tapes with Ag(Cu) sheaths exhibited improved grain alignment and interfacial uniformity, as well as enhanced formation of the Bi-free phase (≊Sr 7.5 Ca 6.5 Cu 14 O x ), relative to the Ag-sheathed specimens. The hot-rolled Ag(Cu)-sheathed tapes displayed superior critical current densities (J c ), where magnetization J cm =1.5×10 6 (H∥c) and 4.6×10 5 A/cm 2 (H⊥c) at T=5 K, H=1 T. Correspondingly, these specimens had transport critical current densities (J ct ) of 6.7×10 4 A/cm 2 (H∥c) and 5.4×10 4 A/cm 2 (H⊥c) at T=4.2 K, H=0 T and 2.2×10 4 A/cm 2 (H∥c) and 3.0×10 4 A/cm 2 (H⊥c) at T=4.2 K, H=14 T. The chemical stability of the Ag(Cu) sheath regions during the partial melting process was also studied. Rapid oxidation of copper produced Cu 2 O precipitates in the sheath at 885 °C, and subsequently a Cu 2 O-free zone developed near the core/sheath interface. A theoretical analysis of Cu 2 O precipitate formation and decomposition during thermal processing is presented.",
author = "J. Guo and Lewis, {J. A.} and Goretta, {K. C.} and Justin Schwartz",
year = "1995",
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Properties and chemical stability of hot-rolled Ag(7 at. % Cu)-sheathed Bi 2 Sr 2 Ca 0.64 Cu 1.64 O x powder-in-tube tapes . / Guo, J.; Lewis, J. A.; Goretta, K. C.; Schwartz, Justin.

In: Journal of Applied Physics, Vol. 78, No. 7, 01.12.1995, p. 4596-4607.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Properties and chemical stability of hot-rolled Ag(7 at. % Cu)-sheathed Bi 2 Sr 2 Ca 0.64 Cu 1.64 O x powder-in-tube tapes

AU - Guo, J.

AU - Lewis, J. A.

AU - Goretta, K. C.

AU - Schwartz, Justin

PY - 1995/12/1

Y1 - 1995/12/1

N2 - Bi 2 Sr 2 Ca 0.64 Cu 1.64 O x (nominally Bi2212) powders were fabricated into powder-in-tube Ag- and Ag(7 at. % Cu)-sheathed tapes by cold and hot rolling to investigate the effects of sheath composition and rolling conditions on their microstructural development and superconducting properties. Bi2212 tapes with Ag(Cu) sheaths exhibited improved grain alignment and interfacial uniformity, as well as enhanced formation of the Bi-free phase (≊Sr 7.5 Ca 6.5 Cu 14 O x ), relative to the Ag-sheathed specimens. The hot-rolled Ag(Cu)-sheathed tapes displayed superior critical current densities (J c ), where magnetization J cm =1.5×10 6 (H∥c) and 4.6×10 5 A/cm 2 (H⊥c) at T=5 K, H=1 T. Correspondingly, these specimens had transport critical current densities (J ct ) of 6.7×10 4 A/cm 2 (H∥c) and 5.4×10 4 A/cm 2 (H⊥c) at T=4.2 K, H=0 T and 2.2×10 4 A/cm 2 (H∥c) and 3.0×10 4 A/cm 2 (H⊥c) at T=4.2 K, H=14 T. The chemical stability of the Ag(Cu) sheath regions during the partial melting process was also studied. Rapid oxidation of copper produced Cu 2 O precipitates in the sheath at 885 °C, and subsequently a Cu 2 O-free zone developed near the core/sheath interface. A theoretical analysis of Cu 2 O precipitate formation and decomposition during thermal processing is presented.

AB - Bi 2 Sr 2 Ca 0.64 Cu 1.64 O x (nominally Bi2212) powders were fabricated into powder-in-tube Ag- and Ag(7 at. % Cu)-sheathed tapes by cold and hot rolling to investigate the effects of sheath composition and rolling conditions on their microstructural development and superconducting properties. Bi2212 tapes with Ag(Cu) sheaths exhibited improved grain alignment and interfacial uniformity, as well as enhanced formation of the Bi-free phase (≊Sr 7.5 Ca 6.5 Cu 14 O x ), relative to the Ag-sheathed specimens. The hot-rolled Ag(Cu)-sheathed tapes displayed superior critical current densities (J c ), where magnetization J cm =1.5×10 6 (H∥c) and 4.6×10 5 A/cm 2 (H⊥c) at T=5 K, H=1 T. Correspondingly, these specimens had transport critical current densities (J ct ) of 6.7×10 4 A/cm 2 (H∥c) and 5.4×10 4 A/cm 2 (H⊥c) at T=4.2 K, H=0 T and 2.2×10 4 A/cm 2 (H∥c) and 3.0×10 4 A/cm 2 (H⊥c) at T=4.2 K, H=14 T. The chemical stability of the Ag(Cu) sheath regions during the partial melting process was also studied. Rapid oxidation of copper produced Cu 2 O precipitates in the sheath at 885 °C, and subsequently a Cu 2 O-free zone developed near the core/sheath interface. A theoretical analysis of Cu 2 O precipitate formation and decomposition during thermal processing is presented.

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