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Single-phase iron-based superconducting material based on fluoride and preparation method thereof

A technology of superconducting materials and fluorides, which is applied in the usage of superconducting elements, superconducting devices, superconducting/high-conducting conductors, etc., to achieve the effects of ensuring high quality, reducing intermediate links, and saving 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 our group have 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, get T c The superconductivity is about 32K; and based on the same consideration, the example of replacing the LaO layer with a BaF layer and obtaining superconductivity through doping has not been reported

Method used

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  • Single-phase iron-based superconducting material based on fluoride and preparation method thereof
  • Single-phase iron-based superconducting material based on fluoride and preparation method thereof
  • Single-phase iron-based superconducting material based on fluoride and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Synthesis of superconducting materials by solid-state reaction method (Ba 1-x RE x ) FeAsF, where x=0.50, RE=La. The operation steps are as follows

[0035] 1) Step 1: Preparation of the precursor: using a solid state reaction method, mix and grind As particles with a purity of 99.5% and Ba particles with a purity of 99%-99.99% at a molar ratio of 1:1, and then press them into a small circle with a diameter of 10mm Tablets, wherein the tablet pressure is 2Mpa; sealed in a high vacuum (about 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 680°C for 10 hours to obtain the BaAs compound;

[0036] Use the same method to prepare the LaAs precursor, except that the second step needs to be sintered at 720°C for 10 hours to obtain the LaAs precursor;

[0037] The BaAs and LaAs precursor samples can also be ground, returned to the furnace, and re-sintered, and the process of step 1) c...

Embodiment 2

[0042] Synthesis of superconducting materials by solid-state reaction method (Ba 1-x RE x ) FeAsF, where x=0.45, RE=Ce. The operation steps are as follows

[0043] 1) Step 1: Preparation of the precursor: using a solid state reaction method, mix and grind As particles with a purity of 99.5% and Ba particles with a purity of 99%-99.99% at a molar ratio of 1:1, and then press them into a small circle with a diameter of 10mm Tablets (wherein the tableting pressure is 3Mpa), sealed in a high vacuum (about 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 680°C for 10 hours to obtain the BaAs compound; the preparation of the CeAs precursor is basically similar to that of BaAs, except that The second step requires sintering at 780°C for 10 hours; BaAs and CeAs precursor samples are ground, returned to the furnace, and re-sintered to ensure sample uniformity;

[0044] 2) Step 2: Synthesis: T...

Embodiment 3

[0048] Synthesis of superconducting materials by solid-state reaction method (Ba 1-x RE x ) FeAsF, where x = 0.35, RE = Pr. The operation steps are as follows

[0049] 1) Step 1: Preparation of the precursor: using a solid state reaction method, mix and grind As particles with a purity of 99.5% and Ba particles with a purity of 99%-99.99% at a molar ratio of 1:1, and then press them into a small circle with a diameter of 10mm Tablets (wherein the tableting pressure is 4Mpa), sealed in a high vacuum (about 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 680°C for 10 hours to obtain the BaAs compound; the preparation of the PrAs precursor is basically similar to that of BaAs, except that The second step requires sintering at 750°C for 10 hours; BaAs and PrAs precursor samples are ground, returned to the furnace, and re-sintered to ensure sample uniformity;

[0050] 2) Step 2: Synthesi...

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Abstract

The invention relates to a single-phase iron-based superconducting material based on a fluoride and a preparation method thereof. The material has a quasi-two-dimensional laminate structure and constitution is represented by the following formula: (Ba1-xREx)FeAsF, wherein x is more than 0.35 but less than 0.60, and RE is La, Ce, Pr, Nd or Sm. The preparation method of the material comprises: firstly preparing BaAs, LaAs, CeAs, PrAs, NdAs and SmAs precursor samples, and partially replacing bivalent Ba ions with tervalent rear earth metal ions at high temperature by using a solid state chemical reaction method and an ion mechanism of doping effect to prepare the iron-based superconducting material based on the fluoride. The material has electronic carrier characteristics, the carrier concentration is 1020-1022 / cm3, the superconducting transformation temperature of the superconducting material is about 51K, and the preparation method is simple. The material has an upper critical magnetic field expected to be more than 150 tesla at low temperature and can be applied to the aspects, such as superconducting electricity transmission, generation of strong magnetic field and the like. In addition, the material can be applied to the aspects, such as superconducting filters 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 (Ba 1-x RE x ) FeAsF (wherein, 0.35<x<0.60, RE=La, Ce, Pr, Nd or Sm) iron-based superconducting material and its preparation method. Background technique [0002] At present, similar materials, that is, layered oxyphosphorus compounds, can be uniformly expressed as quaternary compounds of LnOMPn (wherein Ln=La and Pr, etc.; M=Mn, Fe, Co and 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 LaFeAs[O 1-x f x ] found in the superconductivity with an initial transition temperature as high as 26K, which has aroused widespread concern in the superconducting community, and set off a new round of upsurge in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/553C04B35/622H01B12/00
CPCY02E40/64Y02E40/60
Inventor 牟刚闻海虎曾斌祝熙宇程鹏韩非沈冰
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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