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

doi:10.1016/j.jallcom.2008.03.056

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 journal › Article › peer-review

12 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 J_C(H) plot gives sample dependent critical current density. The samples heat treated at relatively low temperatures show enhanced flux pinning and hence improved J_C(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 J_C.

Original language	English
Pages (from-to)	63-66
Number of pages	4
Journal	Journal of Alloys and Compounds
Volume	470
Issue number	1-2
DOIs	https://doi.org/10.1016/j.jallcom.2008.03.056
Publication status	Published - 20-02-2009

All Science Journal Classification (ASJC) codes

Mechanical Engineering
Mechanics of Materials
Materials Chemistry
Metals and Alloys

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10.1016/j.jallcom.2008.03.056

Cite this

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

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.",

author = "Neson Varghese and K. Vinod and Ashok Rao and Kuo, {Y. K.} and U. Syamaprasad",

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T1 - Enhanced superconducting properties of bulk MgB2 prepared by in situ Powder-In-Sealed-Tube method

AU - Varghese, Neson

AU - Vinod, K.

AU - Rao, Ashok

AU - Kuo, Y. K.

AU - Syamaprasad, U.

PY - 2009/2/20

Y1 - 2009/2/20

N2 - 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.

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

Abstract

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