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Iron-based superconducting material with single-phase calcium-fluorine structure and method for preparing same

A superconducting material, single-phase calcium technology, applied in the usage of superconducting elements, superconducting devices, superconducting/high-conducting conductors, etc., to achieve high superconducting transition temperature, reduce intermediate links, and save energy and time.

Inactive Publication Date: 2010-06-23
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Recently, two groups in Japan and Germany and the inventor obtained a new type of parent phase of a fluoride-based iron-based superconductor by replacing the LaO layer in LaFeAsO with a CaF or SrF layer, and through doping, got a T c The superconductivity is about 32K; for the series of samples based on the CaF layer, there are only reports of superconductors obtained by substituting Co or Ni for the Fe site, but T c None exceed 30K

Method used

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  • Iron-based superconducting material with single-phase calcium-fluorine structure and method for preparing same
  • Iron-based superconducting material with single-phase calcium-fluorine structure and method for preparing same
  • Iron-based superconducting material with single-phase calcium-fluorine structure and method for preparing same

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Direct synthesis of superconducting materials (Ca 1-x RE x ) FeAsF, wherein x=0.6, Re=Pr; Concrete steps are as follows

[0036] 1) Step 1: Preparing the precursor: using a solid-state reaction method, mix and grind 99.5% pure As particles and 99% pure Ca metal flakes (or Pr metal) at a molar ratio of 1:1 (as long as the grinding is uniform ), and then pressed into a small disc with a diameter of 10mm, wherein the tablet pressure is 2Mpa; sealed in a high vacuum (the vacuum in the tube is less than 10 -5 Pa) in a quartz tube or a high-melting-point metal tube, first slowly raise the temperature to 500°C for 12 hours, and then sinter at 780°C for 5-10 hours to obtain the CaAs or PrAs precursor;

[0037] 2) Step 2: Synthesis: Take the two precursors prepared in step 1), including CaAs and PrAs;

[0038] CaAs, PrAs, Fe powder and FeF 2 The powder is weighed according to the molar ratio of (1-x): (x): 0.5: 0.5;

[0039] Among them x=0.6; Namely according to (Ca 1-x PR...

Embodiment 2

[0042] Synthesis of superconducting materials (Ca 1-x RE x ) FeAsF, where x=0.6, RE=Nd, the operation steps are as follows

[0043] 1) Step 1: Precursor preparation: using a solid state reaction method, mix and grind 99.5% pure As particles and 99% pure Ca metal flakes (or Nd metal) at a molar ratio of 1:1, and then press them into a diameter of 10mm Small discs (tabletting pressure 3Mpa), sealed in a high-vacuum quartz tube or a high-melting point metal tube, first slowly raised the temperature to 500 ° C for 12 hours, and then sintered at 780 ° C for 10 hours, That is, CaAs or NdAs compounds are obtained;

[0044] 2) Step 2: Synthesis: take the precursor prepared in step 1), including CaAs and NdAs;

[0045] with Fe and FeF 2 , by (1-x): (x): 0.5: 0.5 molar ratio weighing;

[0046] Among them x=0.6; Namely according to (Ca 1-x Nd x ) FeAsF cationic stoichiometric weighing, mixing and grinding (grinding process can also be carried out in an inert gas glove box), then t...

Embodiment 3

[0049] Synthesis of superconducting materials (Ca 1-x RE x ) FeAsF, where x=0.6, RE=La, the operation steps are as follows

[0050] 1) Step 1: Precursor preparation: using a solid state reaction method, 99.5% pure As particles and 99% pure Ca metal flakes (or La metal) were mixed and ground at a molar ratio of 1:1, and then pressed into a diameter of 10mm Small discs (tabletting pressure 3Mpa), sealed in a high-vacuum quartz tube or a high-melting point metal tube, first slowly heated to 500 ° C for 12 hours, and then sintered at 780 ° C for 10 hours , to obtain CaAs or LaAs compounds;

[0051] 2) Step 2: Synthesis: take the precursor prepared in step 1), including CaAs and LaAs;

[0052] with Fe and FeF 2 , by (1-x): (x): 0.5: 0.5 molar ratio weighing;

[0053] Among them x=0.6; Namely according to (Ca 1-x La x ) FeAsF cationic stoichiometric weighing, mixing and grinding (grinding process can also be carried out in an inert gas glove box), then tablet, sealed in high ...

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Abstract

The invention relates to an iron-based superconducting material and a method for preparing the same. The composition of the material is expressed by the following formula: (Ca1-xREx)FeAsF, wherein x is more than 0.2 and less than 0.6; and RE maybe La, Ce, Pr, Nd or Sm. The method for preparing the material comprises the following steps of: preparing samples of precursors of CaAs and REAs; and using rare earth metallic ions to partially replace Ca ions at a high temperature by the solid-state chemical reaction method and the ion doping mechanism so as to obtain the iron-based superconducting material with a calcium-fluorine structure. The superconducting transition temperature of the superconducting material is 30 to 56K, and the preparation method is simple; and the upper critical magnetic field of the superconducting material at a low temperature is estimated to be 120 teslas, so that the superconducting material is applicable in fields of superconducting power transmission, generation of strong magnetic fields and the like.

Description

technical field [0001] The present invention relates to a kind of superconducting material and preparation method thereof, particularly relate to a kind of molecular formula is (Ca 1-x RE x ) FeAsF (wherein, 0.2<x<0.6, RE is La, Ce, Pr, Nd or Sm) iron-based superconducting material with a single-phase calcium-fluorine structure and a preparation method thereof. Background technique [0002] At present, similar materials, that is, layered oxyphosphorus compounds, can be uniformly expressed as quaternary compounds of LnOMPn (wherein Ln=La or Pr; M=Mn, Fe, Co or Ni; Pn=P and As). Some of them (LaOFeP, LaONiP) were found to exhibit superconductivity at low temperature (3-5K) in 2006. In early 2008, Kamihara et al. (Y.Kamihara, T.Watanabe, M.Hirano, and H.Hosono, J.Am.Chem.Soc.130, 3296 (2008)) reported on fluorine-doped La[0 1-x f x ] The superconductivity found in FeAs with an initial transition temperature as high as 26K has aroused widespread concern in the supercon...

Claims

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Application Information

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IPC IPC(8): C04B35/553C04B35/622H01B12/00
CPCY02E40/64Y02E40/60
Inventor 程鹏闻海虎沈冰祝熙宇韩非牟刚曾斌
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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