Preparation method of iron-based REFeAsO1-xFx superconducting material

A superconducting material, iron-based technology, which is applied in the field of preparation of iron-based REFeAsO1-xFx superconducting materials, can solve the problems of large deviation of separation schedule, easy rupture of quartz tubes, complicated high-voltage equipment, etc., and achieves composition determination and single-phase property. Good, high superconducting transition temperature effect
CN101774811BInactive Publication Date: 2012-08-22SOUTHWEST JIAOTONG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SOUTHWEST JIAOTONG UNIV
Publication Date
2012-08-22
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a preparation method of a iron-based REFeAsO1-xFx superconducting material, wherein RE is one of lanthanum, cerium, praseodymium, neodymium, samarium or gadolinium, when RE is lanthanum, x is more than or equal to 0.03and less than or equal to 0.02; and when RE is one of cerium, praseodymium, neodymium, samarium or gadolinium, x is more than or equal to 0.05 and less thanor equal to 0.35. The method comprises the following steps: a. according to stoichiometric ratio of the iron-based REFeAsO1-xFx superconducting material, under argon protective atmosphere, respectively weighing REAs, Fe, Fe203 and REF3 nanoparticle with particle diameter of 5-100 nano, mixing and grinding tabletings; b. under the argon protective atmosphere, packing the tablettings by using tantalum sheets and sealing the tablettings in a vacuum quartz tube; and c. putting the quartz tube in a sintering furnace, under the argon protective atmosphere, ringing temperature at 100-200 DEG C / h to 1050-1100 DEG C / h, heat preserving for 36-50 hours, and cooling with the furnace to gain the material. The method has low preparation temperature, and the prepared iron-based REFeAsO1-xFx superconducting material has high purity, determined compositions, uniformity, stable performance and high superconducting transition temperature.
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Description

technical field

[0001] The invention relates to an iron-based REFeAsO 1-x f x Methods for the preparation of superconducting materials. 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 LaFeAs[O 1-x f x ] 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 vol. 453, p. 761). Subsequently, a series of Fe-based REFeAsO 1-x f x Superconducting materials have appeared one after another. ...

Claims

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