Strong influence of precursor powder on the critical current density of Fe-sheathed MgB2 tapes

Dongliang Wang; Yanwei Ma; Zhengguang Yu; Zhaoshun Gao; Xianping Zhang; K. Watanabe; E. Mossang

doi:10.1088/0953-2048/20/6/015

Strong influence of precursor powder on the critical current density of Fe-sheathed MgB₂ tapes

Dongliang Wang, Yanwei Ma, Zhengguang Yu, Zhaoshun Gao, Xianping Zhang, K. Watanabe, E. Mossang

High Field Laboratory for Superconducting Materials

Research output: Contribution to journal › Article › peer-review

37 Citations (Scopus)

Abstract

The effect of the quality of starting powders on the microstructure and superconducting properties of insitu processed Fe-sheathed MgB₂ tapes has been investigated. Three different types of commercial atomized spherical magnesium powder and two different purities of amorphous boron powder were employed. When using the 10νm magnesium as precursor powders, the Mg reacted with boron more uniformly and quickly; thus the uniformity of the fabricated MgB₂ was improved and the grain size of the MgB₂ was decreased. Hence significant critical current density (J_c) enhancements were achieved for MgB₂ tapes. J_c at 4.2K for MgB₂ tapes made from the 10νm Mg and high purity boron powders was at least a factor of ten higher than values measured for MgB₂ samples made from all other starting powders. At 20K, 5T, the typical J _c values of the tapes were over 1.0 × 10⁴Acm ^-2 and were much better than those of tape samples reported recently.

Original language	English
Article number	015
Pages (from-to)	574-578
Number of pages	5
Journal	Superconductor Science and Technology
Volume	20
Issue number	6
DOIs	https://doi.org/10.1088/0953-2048/20/6/015
Publication status	Published - 2007 Jun 1

ASJC Scopus subject areas

Ceramics and Composites
Condensed Matter Physics
Metals and Alloys
Electrical and Electronic Engineering
Materials Chemistry

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title = "Strong influence of precursor powder on the critical current density of Fe-sheathed MgB2 tapes",

abstract = "The effect of the quality of starting powders on the microstructure and superconducting properties of insitu processed Fe-sheathed MgB2 tapes has been investigated. Three different types of commercial atomized spherical magnesium powder and two different purities of amorphous boron powder were employed. When using the 10νm magnesium as precursor powders, the Mg reacted with boron more uniformly and quickly; thus the uniformity of the fabricated MgB2 was improved and the grain size of the MgB2 was decreased. Hence significant critical current density (Jc) enhancements were achieved for MgB2 tapes. Jc at 4.2K for MgB2 tapes made from the 10νm Mg and high purity boron powders was at least a factor of ten higher than values measured for MgB2 samples made from all other starting powders. At 20K, 5T, the typical J c values of the tapes were over 1.0 × 104Acm -2 and were much better than those of tape samples reported recently.",

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AU - Wang, Dongliang

AU - Ma, Yanwei

AU - Yu, Zhengguang

AU - Gao, Zhaoshun

AU - Zhang, Xianping

AU - Watanabe, K.

AU - Mossang, E.

PY - 2007/6/1

Y1 - 2007/6/1

N2 - The effect of the quality of starting powders on the microstructure and superconducting properties of insitu processed Fe-sheathed MgB2 tapes has been investigated. Three different types of commercial atomized spherical magnesium powder and two different purities of amorphous boron powder were employed. When using the 10νm magnesium as precursor powders, the Mg reacted with boron more uniformly and quickly; thus the uniformity of the fabricated MgB2 was improved and the grain size of the MgB2 was decreased. Hence significant critical current density (Jc) enhancements were achieved for MgB2 tapes. Jc at 4.2K for MgB2 tapes made from the 10νm Mg and high purity boron powders was at least a factor of ten higher than values measured for MgB2 samples made from all other starting powders. At 20K, 5T, the typical J c values of the tapes were over 1.0 × 104Acm -2 and were much better than those of tape samples reported recently.

AB - The effect of the quality of starting powders on the microstructure and superconducting properties of insitu processed Fe-sheathed MgB2 tapes has been investigated. Three different types of commercial atomized spherical magnesium powder and two different purities of amorphous boron powder were employed. When using the 10νm magnesium as precursor powders, the Mg reacted with boron more uniformly and quickly; thus the uniformity of the fabricated MgB2 was improved and the grain size of the MgB2 was decreased. Hence significant critical current density (Jc) enhancements were achieved for MgB2 tapes. Jc at 4.2K for MgB2 tapes made from the 10νm Mg and high purity boron powders was at least a factor of ten higher than values measured for MgB2 samples made from all other starting powders. At 20K, 5T, the typical J c values of the tapes were over 1.0 × 104Acm -2 and were much better than those of tape samples reported recently.

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Strong influence of precursor powder on the critical current density of Fe-sheathed MgB₂ tapes

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