Comparative study on the transport critical current density of Bi-2223 and Tl-1212 Ag-sheathed superconductor tapes in low magnetic fields

K. T. Lau, S. K. Chen, Roslan Abd. Shukor

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

High-Tc superconductor tapes with nominal compositions of Bi1.8Pb0.4Sr2Ca2.2Cu3O 10-x (Bi-2223) and (Tl,Cr0.15)Sr2(Ca0.9,Pr0.1)Cu2 O7-x (Tl-1212) were fabricated using the powder-in-tube method. The Tczero's of the tapes, which were subjected to various thermo-mechanical treatments, ranged from 100-103 K for the Bi-2223/Ag tapes and 84-86 K for the Tl-1212/Ag tapes. Their transport critical current densities in low magnetic fields (0.15 T) were compared. All the tapes are dominated by weak links where this is more severe in the Tl-1212/Ag tapes. No significant anisotropic transport properties were observed in Tl-1212/Ag tapes when the magnetic field was applied perpendicular or parallel to the tape plane (i.e. Jc(H)/Jc(H) = 0.75-1.0). The Bi-2223/Ag tapes however show a pronounced anisotropic transport properties in applied magnetic field (i.e. Jc(H)/Jc(H) = 0.15-0.65). This can be associated with the microstructural difference between these two types of tapes. Scanning electron micrographs reveal the slightly aligned grains in the Bi-based tapes while randomly orientated grains were observed in the Tl-based tapes.

Original languageEnglish
Pages (from-to)547-552
Number of pages6
JournalPhysica C: Superconductivity and its Applications
Volume377
Issue number4
DOIs
Publication statusPublished - 15 Sep 2002

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Tapes
tapes
Superconducting materials
critical current
Magnetic fields
current density
magnetic fields
Transport properties
transport properties
thermomechanical treatment
Thermomechanical treatment
Powders
tubes
Scanning
scanning
Electrons

Keywords

  • Anisotropic current density
  • Strong links
  • Tapes

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

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title = "Comparative study on the transport critical current density of Bi-2223 and Tl-1212 Ag-sheathed superconductor tapes in low magnetic fields",
abstract = "High-Tc superconductor tapes with nominal compositions of Bi1.8Pb0.4Sr2Ca2.2Cu3O 10-x (Bi-2223) and (Tl,Cr0.15)Sr2(Ca0.9,Pr0.1)Cu2 O7-x (Tl-1212) were fabricated using the powder-in-tube method. The Tczero's of the tapes, which were subjected to various thermo-mechanical treatments, ranged from 100-103 K for the Bi-2223/Ag tapes and 84-86 K for the Tl-1212/Ag tapes. Their transport critical current densities in low magnetic fields (0.15 T) were compared. All the tapes are dominated by weak links where this is more severe in the Tl-1212/Ag tapes. No significant anisotropic transport properties were observed in Tl-1212/Ag tapes when the magnetic field was applied perpendicular or parallel to the tape plane (i.e. Jc(H⊥)/Jc(H∥) = 0.75-1.0). The Bi-2223/Ag tapes however show a pronounced anisotropic transport properties in applied magnetic field (i.e. Jc(H⊥)/Jc(H∥) = 0.15-0.65). This can be associated with the microstructural difference between these two types of tapes. Scanning electron micrographs reveal the slightly aligned grains in the Bi-based tapes while randomly orientated grains were observed in the Tl-based tapes.",
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T1 - Comparative study on the transport critical current density of Bi-2223 and Tl-1212 Ag-sheathed superconductor tapes in low magnetic fields

AU - Lau, K. T.

AU - Chen, S. K.

AU - Abd. Shukor, Roslan

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N2 - High-Tc superconductor tapes with nominal compositions of Bi1.8Pb0.4Sr2Ca2.2Cu3O 10-x (Bi-2223) and (Tl,Cr0.15)Sr2(Ca0.9,Pr0.1)Cu2 O7-x (Tl-1212) were fabricated using the powder-in-tube method. The Tczero's of the tapes, which were subjected to various thermo-mechanical treatments, ranged from 100-103 K for the Bi-2223/Ag tapes and 84-86 K for the Tl-1212/Ag tapes. Their transport critical current densities in low magnetic fields (0.15 T) were compared. All the tapes are dominated by weak links where this is more severe in the Tl-1212/Ag tapes. No significant anisotropic transport properties were observed in Tl-1212/Ag tapes when the magnetic field was applied perpendicular or parallel to the tape plane (i.e. Jc(H⊥)/Jc(H∥) = 0.75-1.0). The Bi-2223/Ag tapes however show a pronounced anisotropic transport properties in applied magnetic field (i.e. Jc(H⊥)/Jc(H∥) = 0.15-0.65). This can be associated with the microstructural difference between these two types of tapes. Scanning electron micrographs reveal the slightly aligned grains in the Bi-based tapes while randomly orientated grains were observed in the Tl-based tapes.

AB - High-Tc superconductor tapes with nominal compositions of Bi1.8Pb0.4Sr2Ca2.2Cu3O 10-x (Bi-2223) and (Tl,Cr0.15)Sr2(Ca0.9,Pr0.1)Cu2 O7-x (Tl-1212) were fabricated using the powder-in-tube method. The Tczero's of the tapes, which were subjected to various thermo-mechanical treatments, ranged from 100-103 K for the Bi-2223/Ag tapes and 84-86 K for the Tl-1212/Ag tapes. Their transport critical current densities in low magnetic fields (0.15 T) were compared. All the tapes are dominated by weak links where this is more severe in the Tl-1212/Ag tapes. No significant anisotropic transport properties were observed in Tl-1212/Ag tapes when the magnetic field was applied perpendicular or parallel to the tape plane (i.e. Jc(H⊥)/Jc(H∥) = 0.75-1.0). The Bi-2223/Ag tapes however show a pronounced anisotropic transport properties in applied magnetic field (i.e. Jc(H⊥)/Jc(H∥) = 0.15-0.65). This can be associated with the microstructural difference between these two types of tapes. Scanning electron micrographs reveal the slightly aligned grains in the Bi-based tapes while randomly orientated grains were observed in the Tl-based tapes.

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