Preparation method of Fe (Se, Te) superconducting wire

A technology of superconducting wire and mixed powder, which is applied in the usage of superconducting elements, superconducting devices, superconducting/high-conducting conductors, etc., can solve the problems of limited oxygen annealing, shorten the ball milling time and meet the performance requirements , Simple and effective with low effect

Active Publication Date: 2021-09-03
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But for wire and strip, it is difficult for oxygen to enter the inside of the sheath during post-treatment in a low-oxygen atmosphere, which greatly limits the effect of annealing under oxygen.

Method used

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  • Preparation method of Fe (Se, Te) superconducting wire
  • Preparation method of Fe (Se, Te) superconducting wire
  • Preparation method of Fe (Se, Te) superconducting wire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] This embodiment includes the following steps:

[0041] Step 1. In a glove box filled with argon, place the mixed powder in an agate mortar and grind for 30 minutes; : 0.5:0.05:0.05 molar ratio composition;

[0042] The iron powder is reduced iron powder with a mass purity of 99.99%, the mass purity of the selenium powder, tellurium powder and silver powder is 99.99%, and the mass purity of the selenium dioxide powder is 99.9%;

[0043] Step 2. In a glove box filled with argon, put the ground mixed powder in Step 1 into a tableting mold and seal it, then take it out and place it on a tableting machine for pressing to obtain doped Fe- Se-Te green body; the pressure of the pressing treatment is 10MPa, and the time is 10min;

[0044] Step 3, taking out the doped Fe-Se-Te green body obtained in step 2 from the tableting mold, placing it in a quartz tube, sealing it with a hydrogen-oxygen flame, and then placing it in a sintering furnace for sintering. Obtain Fe(Se,Te) sup...

Embodiment 2

[0057] This embodiment includes the following steps:

[0058] Step 1. In a glove box filled with argon, place the mixed powder in an agate mortar and grind for 30 minutes; :0.5:0.01:0.01 molar ratio composition;

[0059] The iron powder is reduced iron powder with a mass purity of 99.99%, the mass purity of the selenium powder, tellurium powder and silver powder is 99.99%, and the mass purity of the selenium dioxide powder is 99.9%;

[0060]Step 2. In a glove box filled with argon, put the ground mixed powder in Step 1 into a tableting mold and seal it, then take it out and place it on a tableting machine for pressing to obtain doped Fe- Se-Te green body; the pressure of the pressing treatment is 10MPa, and the time is 10min;

[0061] Step 3, taking out the doped Fe-Se-Te green body obtained in step 2 from the tableting mold, placing it in a quartz tube, sealing it with a hydrogen-oxygen flame, and then placing it in a sintering furnace for sintering. Obtain Fe(Se,Te) super...

Embodiment 3

[0071] This embodiment includes the following steps:

[0072] Step 1. In a glove box full of argon, place the mixed powder in an agate mortar and grind for 60 minutes; :0.2:0.01:0.01 molar ratio composition;

[0073] The iron powder is reduced iron powder with a mass purity of 99.999%, the mass purity of the selenium powder, tellurium powder and silver powder is 99.999%, and the mass purity of the selenium dioxide powder is 99.99%;

[0074] Step 2. In a glove box filled with argon, put the ground mixed powder in Step 1 into a tableting mold and seal it, then take it out and place it on a tableting machine for pressing to obtain doped Fe- Se-Te green body; the pressure of the pressing treatment is 5MPa, and the time is 2min;

[0075] Step 3, taking out the doped Fe-Se-Te green body obtained in step 2 from the tableting mold, placing it in a quartz tube, sealing it with a hydrogen-oxygen flame, and then placing it in a sintering furnace for sintering. Obtain Fe(Se,Te) superco...

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Abstract

The invention discloses a preparation method of a Fe (Se, Te) superconducting wire. The method comprises the following steps of 1, grinding iron powder, selenium powder, tellurium powder, silver powder and selenium dioxide powder; 2, pressing to obtain a doped Fe-Se-Te green body; 3, sintering the doped Fe-Se-Te green body to obtain a Fe (Se, Te) superconducting material block body; 4, performing high-energy ball milling to obtain Fe (Se, Te) superconducting powder; and 5, loading the Fe (Se, Te) superconducting powder into a tube, and sintering to obtain the Fe (Se, Te) superconducting wire. The method is advantaged in that silver and oxygen co-doping is formed in the raw material powder by adopting a chemical co-doping method, the Fe (Se, Te) grain boundary connectivity is enhanced through the silver element, the interstitial iron content in Fe (Se, Te) crystal lattices is reduced in combination with the oxygen element, the superconducting performance of the Fe (Se, Te) superconducting wire is synergistically improved, and two problems of grain boundary connectivity and interstitial iron of the FeSe-based superconducting wire are solved.

Description

technical field [0001] The invention belongs to the field of superconducting material preparation, and in particular relates to a preparation method of Fe(Se,Te) superconducting wire. Background technique [0002] The Japanese Hosono research group first reported LaO with a critical temperature of 26K in 2008. 1-x f x FeAs iron-based superconducting materials opened the prelude to the research of iron-based superconducting materials. At present, four main systems have been developed, namely "1111" system (such as LaFeAsOF), "122" system (such as BaFe 2 As 2 ), "111" system (such as LiFeAs) and "11" system (such as FeSe). Similar to copper oxide high-temperature superconductors, the crystal structure of iron-based superconductors is a layered structure, with -FeAs-layer or -FeSe-layer as the superconducting layer. [0003] There are three main reasons for the rapid development of iron-based superconductors: first, it is generally believed that the magnetism of Fe has a d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B12/00
CPCH01B12/00Y02E40/60
Inventor 刘吉星邵柏淘张胜楠冯建情李成山
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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