Fabrication and characterization of iron pnictide wires and bulk materials through the powder-in-tube method

	Fabrication and characterization of iron pnictide wires and bulk materials through the powder-in-tube method
	Ma YW(马衍伟)
刊名	PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
	2009
通讯作者	马衍伟
中文摘要	The recent discovery of superconductivity in the iron-based superconductors with very high upper critical fields presents a new possibility for practical applications, but fabricating fine-wire is a challenge because of mechanically hard and brittle powders and the toxicity and volatility of arsenic. In this paper, we report the synthesis and the physical characterization of iron pnictide wires and bulks prepared by the powder-in-tube method (PIT). A new class of high-T-c iron pnicticle composite wires, Such as LaFeAsO1-xFx, SmFeAsO1-xFx and Sr1-xKxFeAs, has been fabricated by the in situ PIT technique using Fe, Ta and Nb tubes. Microscopy and X-ray analysis show that the superconducting core is continuous. and retains phase composition after wire drawing and heat treatment. Furthermore, the wires exhibit a very weak J(c)-field dependence behavior even at high temperatures. The upper critical field H-c2(0) value can exceed 100 T, surpassing those of MgB2 and all the low temperature superconductors and indicating a strong potential for applications requiring very high field. These results demonstrate the feasibility of producing superconducting pnictide composite wire. We also applied the one-step PIT method to synthesize the iron-based bulks, due to its convenience and safety. In fact, by using this technique, we have successfully discovered superconductivity at 35 K and 15 K in Eu0.7Na0.3Fe2As2 and SmCoFeAsO compounds, respectively. These clearly Suggest that the one-step PIT technique is unique and versatile and hence can be tailored easily for other rare earth derivatives of novel iron-based superconductors.
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 recent discovery of superconductivity in the iron-based superconductors with very high upper critical fields presents a new possibility for practical applications, but fabricating fine-wire is a challenge because of mechanically hard and brittle powders and the toxicity and volatility of arsenic. In this paper, we report the synthesis and the physical characterization of iron pnictide wires and bulks prepared by the powder-in-tube method (PIT). A new class of high-T-c iron pnicticle composite wires, Such as LaFeAsO1-xFx, SmFeAsO1-xFx and Sr1-xKxFeAs, has been fabricated by the in situ PIT technique using Fe, Ta and Nb tubes. Microscopy and X-ray analysis show that the superconducting core is continuous. and retains phase composition after wire drawing and heat treatment. Furthermore, the wires exhibit a very weak J(c)-field dependence behavior even at high temperatures. The upper critical field H-c2(0) value can exceed 100 T, surpassing those of MgB2 and all the low temperature superconductors and indicating a strong potential for applications requiring very high field. These results demonstrate the feasibility of producing superconducting pnictide composite wire. We also applied the one-step PIT method to synthesize the iron-based bulks, due to its convenience and safety. In fact, by using this technique, we have successfully discovered superconductivity at 35 K and 15 K in Eu0.7Na0.3Fe2As2 and SmCoFeAsO compounds, respectively. These clearly Suggest that the one-step PIT technique is unique and versatile and hence can be tailored easily for other rare earth derivatives of novel iron-based superconductors.
内容类型	期刊论文
源URL	[http://ir.iee.ac.cn/handle/311042/385]
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. Fabrication and characterization of iron pnictide wires and bulk materials through the powder-in-tube method[J]. PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS,2009.
APA	马衍伟.(2009).Fabrication and characterization of iron pnictide wires and bulk materials through the powder-in-tube method.PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS.
MLA	马衍伟."Fabrication and characterization of iron pnictide wires and bulk materials through the powder-in-tube method".PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS (2009).