Transport critical current density of Ag-sheathed (Tl,Cr)Sr2CaCu2O7 high temperature superconductor tapes

Nasri A-Hamid, Roslan Abd. Shukor

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Ag-sheathed Tl-1212 tapes with a nominal composition of (Tl1.2Cr0.15)Sr2CaCu2O7 were fabricated using the powder-in-tube (PIT) method. The tapes (approximately 3-4 cm long) were annealed in oxygen flow at 820 °C, 870 °C and 890 °C each for 30 minutes, 1 hour and 5 hours, respectively. The x-ray diffraction (XRD) patterns for samples annealed at 820 °C and 870 °C showed the Tl-1212 as the dominant phase with Tl-1201 as minor phase. Scanning electron micrographs (SEM) revealed that the tapes showed no discernible favourable texture. Using a self-field approximation together with Jc dependence on temperature the characteristic length (Lc) associated with the pinning force is estimated to be approximately the same as the average grains size (Rg) for the tapes annealed at 820 °C for 30 minutes. For tapes that were annealed at 870 °C and 890 °C, Lc>Rg. The initial rapid suppression of Jc at low fields (<0.1 T) can be attributed to the weak-links phenomena as observed in other polycrystalline high-Tc materials with random grain orientations.

Original languageEnglish
Pages (from-to)113-116
Number of pages4
JournalSuperconductor Science and Technology
Volume14
Issue number2
DOIs
Publication statusPublished - Feb 2001

Fingerprint

High temperature superconductors
high temperature superconductors
Tapes
tapes
critical current
current density
Powders
Diffraction patterns
x ray diffraction
diffraction patterns
textures
Textures
grain size
retarding
Oxygen
tubes
Scanning
X rays
scanning
Electrons

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Physics and Astronomy (miscellaneous)
  • Condensed Matter Physics

Cite this

Transport critical current density of Ag-sheathed (Tl,Cr)Sr2CaCu2O7 high temperature superconductor tapes. / A-Hamid, Nasri; Abd. Shukor, Roslan.

In: Superconductor Science and Technology, Vol. 14, No. 2, 02.2001, p. 113-116.

Research output: Contribution to journalArticle

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