Preparation method iron based SmFeAsO1-xFx superconducting wire

Abstract

The invention provides a preparation method of an iron-based SmFeAsO<1-x>Fx superconducting wire, comprising the steps as follows: a: material preparation: the material is prepared according to the stoichiometry of the iron-based superconducting material SmFeAsO<1-x>Fx (wherein, x is not more than 0.35 and not less than 0.15, the raw materials such as SmAs, Fe, Fe2O3 and FeF3 are weighed, grinded, uniformly mixed, arranged into a Tantalum pipe, fully fixed and compacted; the two ends of the Tantalum pipe are sealed; b: wire preparation: the Tantalum pipe is sheathed into a copper pipe and rotatablely forged; subsequently, the wire with the diameter of 1.8-2.2mm is formed by pulling and drawing; c: burning: the wire is arranged in a quartz pipe and sealed in vacuum and then put into a sintering furnace; under the protection of inert gas, the temperature of the wire is increased to 1150-1170 DEG C at the speed of 100-150 DEG C / hour, the temperature is kept for 36-50 hours and the wire is cooled with the furnace. The method of the invention has the advantages of simple technology and facilitating industrial production, and the compactness, high purification, stable superconducting performance, high superconducting conversion temperature and high critical magnetic field of the prepared iron-based SmFeAsO<1-x>Fx superconducting wire.

Description

technical field [0001] The invention relates to an iron-based SmFeAsO 1-x f x Preparation method of superconducting material, especially a kind of iron-based SmFeAsO 1-x f x Preparation method of superconducting wire. Background technique [0002] In early 2008, Japanese and Chinese scientists successively reported the discovery of a new class of high-temperature superconducting materials—iron-based superconducting materials, which aroused widespread concern in the scientific community. Japanese scientists first discovered that La[O 1-x f x ] FeAs compounds have superconducting properties at a critical temperature of 26 Kelvin ("Journal of the American Chemical Society" volume 130, p. 3296). Subsequently, the research team led by Chen Xianhui from the University of Science and Technology of China discovered that SmFeAsO 0.85 f 0.15 The compound also becomes a superconductor at a critical temperature of 43 Kelvin ("Nature" volume 453, p. 761). When the fluorine doping...

AI Technical Summary

Problems solved by technology

Press the raw materials into sheets and wrap them with tantalum sheets, seal them in a vacuum quartz tube for high-temperature sintering, and wrap them with tantalum sheets to have little sealing and restraining effect on the raw materials, making the prepared superconducting materials loose and poor in material performance

At the same time, during the sintering process, the volatilized fluorine will corrode the quartz tube and cause the quartz tube to break, making the success rate of sample preparation low

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