Enhanced superconducting properties of bulk MgB2 prepared by in situ Powder-In-Sealed-Tube method

Neson Varghese, K. Vinod, Ashok Rao, Y. K. Kuo, U. Syamaprasad

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

A systematic study on the superconducting properties of polycrystalline MgB2 synthesized by in situ Powder-In-Sealed-Tube technique is carried out at different temperatures (750-900 °C). Both XRD and SEM results show well-crystallized MgB2 grains in all the samples and grain size is found to be increasing with the sintering temperature. Sharp superconducting transitions are observed for all samples, irrespective of sintering temperatures, which implies the high degree phase purity and homogeneity of MgB2 formed, while JC(H) plot gives sample dependent critical current density. The samples heat treated at relatively low temperatures show enhanced flux pinning and hence improved JC(H) performance. The reduced grain size and hence increased density of grain boundary pinning centers of MgB2 bulks synthesized at low temperature are mainly responsible for the enhanced flux pinning and JC.

Original languageEnglish
Pages (from-to)63-66
Number of pages4
JournalJournal of Alloys and Compounds
Volume470
Issue number1-2
DOIs
Publication statusPublished - 20-02-2009

Fingerprint

Powders
Flux pinning
Sintering
Temperature
Grain boundaries
Scanning electron microscopy

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Chemistry
  • Metals and Alloys

Cite this

Varghese, Neson ; Vinod, K. ; Rao, Ashok ; Kuo, Y. K. ; Syamaprasad, U. / Enhanced superconducting properties of bulk MgB2 prepared by in situ Powder-In-Sealed-Tube method. In: Journal of Alloys and Compounds. 2009 ; Vol. 470, No. 1-2. pp. 63-66.
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Enhanced superconducting properties of bulk MgB2 prepared by in situ Powder-In-Sealed-Tube method. / Varghese, Neson; Vinod, K.; Rao, Ashok; Kuo, Y. K.; Syamaprasad, U.

In: Journal of Alloys and Compounds, Vol. 470, No. 1-2, 20.02.2009, p. 63-66.

Research output: Contribution to journalArticle

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AB - A systematic study on the superconducting properties of polycrystalline MgB2 synthesized by in situ Powder-In-Sealed-Tube technique is carried out at different temperatures (750-900 °C). Both XRD and SEM results show well-crystallized MgB2 grains in all the samples and grain size is found to be increasing with the sintering temperature. Sharp superconducting transitions are observed for all samples, irrespective of sintering temperatures, which implies the high degree phase purity and homogeneity of MgB2 formed, while JC(H) plot gives sample dependent critical current density. The samples heat treated at relatively low temperatures show enhanced flux pinning and hence improved JC(H) performance. The reduced grain size and hence increased density of grain boundary pinning centers of MgB2 bulks synthesized at low temperature are mainly responsible for the enhanced flux pinning and JC.

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