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A kind of preparation method of fetese polycrystalline superconductor

A technology of superconductors and crystal blanks, which is applied in the field of preparation of FeTe1-xSex polycrystalline superconductors, can solve the problem of low critical current density, and achieve the effect of increasing grain size, increasing critical current density, and enhancing orientation between grains

Active Publication Date: 2021-08-24
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the presence of interstitial Fe atoms in the superconducting samples prepared by solid-state reaction, the obtained FeTe 1-x Se x The critical current density of superconducting materials is generally low, and the current density is just the most critical factor limiting its practicality

Method used

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  • A kind of preparation method of fetese polycrystalline superconductor
  • A kind of preparation method of fetese polycrystalline superconductor
  • A kind of preparation method of fetese polycrystalline superconductor

Examples

Experimental program
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Effect test

Embodiment 1

[0030] This example is used to specifically illustrate the preparation method of the FeTeSe polycrystalline superconductor of the present invention.

[0031](1) Mix Fe powder (purity 99.9%), Te powder (purity 99.999%) and Se powder (purity 99.999%) in an atomic ratio of 1:0.6:0.4 and grind them thoroughly for 30 minutes, take out 0.3 grams and put them in In a mold with a diameter of 8 mm, a small piece with a thickness of 1 mm is pressed through the mold under a pressure of 400 MPa, and the small piece is packed into a quartz tube with one end sealed. The quartz tube containing the raw material is evacuated by a molecular pump, and the vacuum degree is 10 -3 Pa or above, and seal the other port with a welding gun to ensure that the sample is in an oxygen-free environment.

[0032] (2) Put the quartz tube sealed with raw materials obtained in step (1) into the center of the cavity of a microwave oven (microwave oven model is EM-310BX, Sanyo), take out the microwave oven turnt...

Embodiment 2

[0050] This example is used to specifically illustrate the preparation method of the FeTeSe polycrystalline superconductor of the present invention.

[0051] (1) Mix Fe powder (purity 99.9%), Te powder (purity 99.999%) and Se powder (purity 99.999%) in an atomic ratio of 1:0.4:0.6 and grind them thoroughly for 30 minutes, take out 0.3 grams and put them in In a mold with a diameter of 8 mm, a small piece with a thickness of 1 mm is pressed through the mold under a pressure of 400 MPa, and the small piece is packed into a quartz tube with one end sealed. The quartz tube containing the raw material is evacuated by a molecular pump, and the vacuum degree is 10 -3 Pa or above, and seal the other port with a welding gun to ensure that the sample is in an oxygen-free environment.

[0052] (2) Put the quartz tube sealed with raw materials obtained in step (1) into the center of the cavity of a microwave oven (microwave oven model is EM-310BX, Sanyo), take out the microwave oven turn...

Embodiment 3

[0057] This example is used to specifically illustrate the preparation method of the FeTeSe polycrystalline superconductor of the present invention.

[0058] (1) Mix Fe powder (purity 99.9%), Te powder (purity 99.999%) and Se powder (purity 99.999%) in an atomic ratio of 1:0.5:0.5 and grind them thoroughly for 30 minutes, take out 0.3 grams and put them in In a mold with a diameter of 8 mm, a small piece with a thickness of 1 mm is pressed through the mold under a pressure of 400 MPa, and the small piece is packed into a quartz tube with one end sealed. The quartz tube containing the raw material is evacuated by a molecular pump, and the vacuum degree is 10 -3 Pa or above, and seal the other port with a welding gun to ensure that the sample is in an oxygen-free environment.

[0059] (2) Put the quartz tube sealed with raw materials obtained in step (1) into the center of the cavity of a microwave oven (microwave oven model is EM-310BX, Sanyo), take out the microwave oven turn...

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Abstract

The present invention provides FeTe 1‑x Se x The preparation method of the polycrystalline superconductor comprises the following steps: (1) mixing Fe powder, Te powder and Se powder in proportion and fully grinding them, putting them into a quartz tube with one end sealed after being pressed into tablets, then vacuumizing, and putting the other end Sealing; (2) Microwave heating is used to obtain FeTe after cooling 1‑x Se x Polycrystalline billet; (3) put it into a heating furnace for annealing, and obtain FeTe after cooling 1‑x Se x polycrystalline superconductor. In the present invention, the rapid synthesis characteristics of microwaves are used to reduce the 1‑x Se x The energy consumed in the preparation process of the superconducting material saves the cost. Since the heat in the microwave in-situ heating process is almost concentrated on the raw material, it can avoid the influence of high temperature on other materials when it is compounded on other materials or workpieces. The present invention also improves the grain boundary connection performance through the non-thermodynamic effect of microwaves in the material synthesis process, and improves the material density, thereby obtaining FeTe with a high critical current density 1‑x Se x Superconducting materials have greatly promoted their practical application.

Description

technical field [0001] The invention belongs to the technical field of preparation of superconducting materials, in particular to FeTe with high critical current density 1-x Se x Methods for the preparation of polycrystalline superconductors. Background technique [0002] Iron-based superconductor is another new type of high-temperature superconductor after copper oxide high-temperature superconductor. Since the discovery of iron-based high-temperature superconducting materials, their practical application has attracted much attention. Compared with traditional alloy superconducting materials, it has a higher superconducting transition temperature, upper critical field and critical current density, and its current density is less dependent on the magnetic field. These characteristics make iron-based high-temperature superconducting in the field of strong electricity Especially in the application of high field magnets, it has unique advantages. On the other hand, iron-bas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B12/00H01B13/00
CPCH01B12/00H01B13/00Y02E40/60
Inventor 潘伯津任治安
Owner INST OF PHYSICS - CHINESE ACAD OF SCI