Preparation method of graphene composite Fe (Se, Te) superconducting material

A graphene composite, superconducting material technology, applied in the usage of superconductor elements, superconducting devices, superconducting/high-conducting conductors, etc., can solve problems such as blanks of FeSe-based superconducting materials, and shorten the time required for grinding , the effect of reducing the elastic modulus and shortening the sintering time

Active Publication Date: 2021-11-12
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are few studies on the mechanical properties of FeSe-based superconducting materials. Only the Jurelo research group in Brazil has studied the intrinsic hardness and elastic modulus of FeSe polycrystals and Fe(Se,Te) single crystals.
However, the research on how to further improve the mechanical properties of FeSe-based superconducting materials is still blank.

Method used

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  • Preparation method of graphene composite Fe (Se, Te) superconducting material
  • Preparation method of graphene composite Fe (Se, Te) superconducting material
  • Preparation method of graphene composite Fe (Se, Te) superconducting material

Examples

Experimental program
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Embodiment 1

[0035] This embodiment includes the following steps:

[0036] Step 1. In a glove box filled with an inert gas, place the mixed powder in an agate mortar and grind for 30 minutes; the mixed powder is composed of iron powder, selenium powder, and tellurium powder in a molar ratio of 1.0:0.5:0.5;

[0037] The iron powder is reduced iron powder with a mass purity of 99.99%, and the mass purity of the selenium powder and tellurium powder are both 99.99%;

[0038] Step 2. In a glove box filled with inert gas, 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 a Fe-Se-Te billet body; the pressure of the pressing treatment is 10MPa, and the time is 10min;

[0039] Step 3. Take the Fe-Se-Te green body obtained in step 2 out of the tableting mold and place it in a quartz tube, seal it with a hydrogen-oxygen flame, then place it in a sintering furnace for sintering, and cool it to room temp...

Embodiment 2

[0051] This embodiment includes the following steps:

[0052] Step 1. In a glove box filled with an inert gas, place the mixed powder in an agate mortar and grind for 120 minutes; the mixed powder is composed of iron powder, selenium powder, and tellurium powder in a molar ratio of 1.0:0.5:0.5; The iron powder is reduced iron powder with a mass purity of 99.9%, and the mass purity of the selenium powder and tellurium powder are both 99.999%;

[0053] Step 2. In a glove box filled with inert gas, 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 a Fe-Se-Te billet body; the pressure of the pressing treatment is 5MPa, and the time is 10min;

[0054] Step 3. Take the Fe-Se-Te green body obtained in step 2 out of the tableting mold and place it in a quartz tube, seal it with a hydrogen-oxygen flame, then place it in a sintering furnace for sintering, and cool it to room temperature ...

Embodiment 3

[0059] This embodiment includes the following steps:

[0060] Step 1. In a glove box filled with an inert gas, place the mixed powder in an agate mortar and grind for 60 minutes; the mixed powder is composed of iron powder, selenium powder, and tellurium powder in a molar ratio of 1.0:0.5:0.5; The iron powder is reduced iron powder with a mass purity of 99.99%, and the mass purity of the selenium powder and tellurium powder are both 99.99%;

[0061] Step 2. In a glove box filled with inert gas, 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 a Fe-Se-Te billet body; the pressure of the pressing treatment is 18MPa, and the time is 10min;

[0062] Step 3. Take the Fe-Se-Te green body obtained in step 2 out of the tableting mold and place it in a quartz tube, seal it with a hydrogen-oxygen flame, then place it in a sintering furnace for sintering, and cool it to room temperature ...

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Abstract

The invention discloses a preparation method of a graphene composite Fe (Se, Te) superconducting material. The method comprises the steps: 1, grinding mixed powder; 2, putting the ground mixed powder into a mold, sealing, and pressing to obtain a Fe-Se-Te green body; 3, carrying out sintering treatment to obtain a Fe (Se, Te) superconducting material block; 4, performing high-energy ball milling treatment on the Fe (Se, Te) superconducting material block and graphene to obtain graphene mixed Fe (Se, Te) superconducting powder; and 5, carrying out spark plasma sintering to obtain the graphene composite Fe (Se, Te) superconducting material. According to the invention, graphene is adopted as a dopant to carry out doping compounding on Fe (Se, Te) superconducting material blocks, so that on the premise that the superconducting performance of the system is not reduced, the elastic modulus of the FeSe system is effectively reduced, the mechanical property difference between the superconducting material and the outer sheath is reduced, and the mechanical property and the superconducting performance of the superconducting wire strip are improved.

Description

technical field [0001] The invention belongs to the technical field of superconducting material preparation, and in particular relates to a preparation method of graphene composite Fe(Se, Te) superconducting material. 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 believe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B12/00H01B12/02
CPCH01B12/00H01B12/02Y02E40/60
Inventor 刘吉星邵柏淘张胜楠冯建情李成山张平祥
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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