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febi(te,se) polycrystalline superconducting material and its preparation method and application

A technology of superconducting material and molar ratio, applied in the field of superconductivity, can solve the problem of low critical current density and achieve the effect of high critical current density, good repeatability and simple method

Active Publication Date: 2022-07-15
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

[0005] In order to overcome the problem that the critical current density of the Fe(Te, Se) superconducting material synthesized by solid-state reaction is generally low in the prior art, the present invention provides a FeBi(Te, Se) polycrystalline superconducting material

Method used

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  • febi(te,se) polycrystalline superconducting material and its preparation method and application
  • febi(te,se) polycrystalline superconducting material and its preparation method and application
  • febi(te,se) polycrystalline superconducting material and its preparation method and application

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Embodiment 1

[0026] This embodiment is used to specifically illustrate the preparation method of the FeBi(Te,Se) polycrystalline superconducting material of the present invention.

[0027] (1) Mix Fe powder (purity 99.9%), Te powder (purity 99.999%), Se powder (purity 99.999%) and Bi powder in an atomic ratio of 1:0.5:0.5:0.015 and thoroughly grind for 30 minutes, Take out 1.5 grams and put it into a mold with a diameter of 8 mm, press it into small pieces through the mold under a pressure of 400 MPa, and put the small pieces into a quartz tube sealed at one end. The quartz tube containing the raw materials is evacuated by a molecular pump, and the vacuum degree is 10 -3 above Pa, and seal the other port with a welding torch to ensure that the sample is in an oxygen-free environment. Put the sealed quartz tube into a box furnace, heat it up to 680°C for 20 hours and keep it for 40 hours, then cool it down to room temperature for 20 hours, and obtain FeBi after cooling. 0.015 Te 0.5 Se ...

Embodiment 2

[0039] This embodiment is used to specifically illustrate the preparation method of the FeBi(Te,Se) polycrystalline superconducting material of the present invention.

[0040] (1) Mix Fe powder (purity 99.9%), Te powder (purity 99.999%), Se powder (purity 99.999%) and Bi powder in an atomic ratio of 1:0.5:0.5:0.005 and thoroughly grind for 30 minutes, Take out 1.5 grams and put it into a mold with a diameter of 8 mm, press it into small pieces through the mold under a pressure of 400 MPa, and put the small pieces into a quartz tube sealed at one end. The quartz tube containing the raw materials is evacuated by a molecular pump, and the vacuum degree is 10 -3 above Pa, and seal the other port with a welding torch to ensure that the sample is in an oxygen-free environment. Put the sealed quartz tube into a box furnace, heat it up to 680°C for 20 hours and keep it for 40 hours, then cool it down to room temperature for 20 hours, and obtain FeBi after cooling. 0.005 Te 0.5 Se ...

Embodiment 3

[0046] This embodiment is used to specifically illustrate the preparation method of the FeBi(Te,Se) polycrystalline superconducting material of the present invention.

[0047] (1) Mix Fe powder (purity 99.9%), Te powder (purity 99.999%), Se powder (purity 99.999%) and Bi powder in an atomic ratio of 1:0.5:0.5:0.01 and thoroughly grind for 30 minutes, Take out 1.5 grams and put it into a mold with a diameter of 8 mm, press it into small pieces through the mold under a pressure of 400 MPa, and put the small pieces into a quartz tube sealed at one end. The quartz tube containing the raw materials is evacuated by a molecular pump, and the vacuum degree is 10 -3 above Pa, and seal the other port with a welding torch to ensure that the sample is in an oxygen-free environment. Put the sealed quartz tube into a box furnace, heat it up to 680°C for 20 hours and keep it for 40 hours, then cool it down to room temperature for 20 hours, and obtain FeBi after cooling. 0.01 Te 0.5 Se 0....

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Abstract

The present invention provides a FeBi(Te,Se) polycrystalline superconducting material, wherein the chemical formula of the FeBi(Te, Se) polycrystalline superconducting material is Fe 1+x Bi y Te 1‑z Se z , where -0.1<x<0.1, 0

Description

technical field [0001] The invention belongs to the technical field of superconductivity. In particular, the present invention relates to FeBi(Te,Se) polycrystalline superconducting materials and preparation methods and applications thereof. Background technique [0002] Iron-based superconductor is a new type of high-temperature superconductor discovered in 2008. According to its parent element composition and crystal structure, it is mainly divided into four systems, "1111", "122", "111" and "11" system. Among them, Fe(Te,Se) of the "11" type iron-based superconductor has a simple structure and does not contain active or toxic elements. It is a relatively stable and safe material in iron-based superconductors. [0003] Compared with traditional alloy superconducting materials, iron-based superconducting materials have higher superconducting transition temperature, upper critical field and critical current density (J c ). At the same time, its critical current density is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B19/00H01B12/00
CPCC01B19/002H01B12/00C01P2002/72C01P2004/03C01P2006/40Y02E40/60
Inventor 潘伯津任治安
Owner INST OF PHYSICS - CHINESE ACAD OF SCI