Nanosized Cr2O3 as pinning center in (Bi,Pb)-Sr-Ca-Cu-O superconductor tapes

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Nanosized Cr2O3 (6 nm) has been introduced into (Bi,Pb)-Sr-Ca-Cu-O/Ag tapes fabricated by the powderin-tube method. The starting powder with composition (Bi,Pb)2Sr2Ca2Cu 3O10(Cr2O3)0.05 was prepared by the solid state reaction method. The superconductor tapes with thickness of about 0.3 mm and length about 2 cm were heated at 845°C for 96, 144, 192 and 240 h. The samples were characterized by the four point probe electrical measurements, X-ray powder diffraction method and scanning electron microscopy. The transport critical current density, Jc was measured from 30 to 65 K using the 1 μ/cm criterion. The highest Jc was obtained for the tape heated for 240 h with Jc = 1700 A/cm 2 at 30 K. XRD patterns showed that the samples consisted of the 2212 and 2223 phase. SEM micrographs showed the plat-like structure. The role of nano-Cr2O3 in the superconductor system is discussed. The size of the nanoparticle (R) was larger than the coherence length, ξ but smaller than the penetration depth, λ(ξ< R <λ). The temperature dependent Jc from 30 to 65 K showed a linear relation for all except for the tapes heated at 240 h. Using the self-field approximation together with the Jc dependence on temperature, it was observed that between 30 and 65 K the characteristic length (Lc) associated with the pinning force Fp is approximately the same as the average grain size (Rg) in all samples except for the tapes heated for 240 h where Rg < Lc. This shows that a change in the flux pinning mechanism occurred in the tapes when the heating time was prolonged.

Original languageEnglish
Title of host publicationAIP Conference Proceedings
Pages292-295
Number of pages4
Volume1528
DOIs
Publication statusPublished - 2013
Event2012 National Physics Conference, PERFIK 2012 - Bukit Tinggi, Pahang
Duration: 19 Nov 201221 Nov 2012

Other

Other2012 National Physics Conference, PERFIK 2012
CityBukit Tinggi, Pahang
Period19/11/1221/11/12

Fingerprint

BSCCO superconductors
tapes
scanning electron microscopy
flux pinning
electrical measurement
critical current
penetration
grain size
current density
tubes
solid state
nanoparticles
heating
temperature
probes
approximation
diffraction

Keywords

  • Superconductor tapes; current density; nano-sized CrO

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Nanosized Cr2O3 as pinning center in (Bi,Pb)-Sr-Ca-Cu-O superconductor tapes. / Lee, G. H.; Abd. Shukor, Roslan.

AIP Conference Proceedings. Vol. 1528 2013. p. 292-295.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Lee, GH & Abd. Shukor, R 2013, Nanosized Cr2O3 as pinning center in (Bi,Pb)-Sr-Ca-Cu-O superconductor tapes. in AIP Conference Proceedings. vol. 1528, pp. 292-295, 2012 National Physics Conference, PERFIK 2012, Bukit Tinggi, Pahang, 19/11/12. https://doi.org/10.1063/1.4803611
Lee, G. H. ; Abd. Shukor, Roslan. / Nanosized Cr2O3 as pinning center in (Bi,Pb)-Sr-Ca-Cu-O superconductor tapes. AIP Conference Proceedings. Vol. 1528 2013. pp. 292-295
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