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

	Strong influence of precursor powder on the critical current density of Fe-sheathed MgB2 tapes
	Ma YW(马衍伟)
刊名	SUPERCONDUCTOR SCIENCE & TECHNOLOGY
	2007
通讯作者	马衍伟
中文摘要	The effect of the quality of starting powders on the microstructure and superconducting properties of in situ 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 10 mu m 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. J(c) at 4.2 K for MgB2 tapes made from the 10 mu m 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 20 K, 5 T, the typical J(c) values of the tapes were over 1.0 x 10(4) A cm(-2) and were much better than those of tape samples reported recently.
学科主题	材料合成与加工工艺
收录类别	1
公开日期	2010-09-29
附注	The effect of the quality of starting powders on the microstructure and superconducting properties of in situ 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 10 mu m 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. J(c) at 4.2 K for MgB2 tapes made from the 10 mu m 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 20 K, 5 T, the typical J(c) values of the tapes were over 1.0 x 10(4) A cm(-2) and were much better than those of tape samples reported recently.
内容类型	期刊论文
源URL	[http://ir.iee.ac.cn/handle/311042/317]
专题	电工研究所_超导材料及强磁场科学研究组_超导材料及强磁场科学研究组_期刊论文
推荐引用方式 GB/T 7714	Ma YW. Strong influence of precursor powder on the critical current density of Fe-sheathed MgB2 tapes[J]. SUPERCONDUCTOR SCIENCE & TECHNOLOGY,2007.
APA	马衍伟.(2007).Strong influence of precursor powder on the critical current density of Fe-sheathed MgB2 tapes.SUPERCONDUCTOR SCIENCE & TECHNOLOGY.
MLA	马衍伟."Strong influence of precursor powder on the critical current density of Fe-sheathed MgB2 tapes".SUPERCONDUCTOR SCIENCE & TECHNOLOGY (2007).