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Preparation method of iron-arsenic compound and iron-based superconductor

A compound, iron-arsenic technology, applied in iron compounds, arsenic compounds, chemical instruments and methods, etc., can solve the problems of low purity and high preparation cost, and achieve the effects of high purity, good crystallinity, and improved purity

Active Publication Date: 2022-07-29
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a method for preparing iron-arsenic compounds and iron-based superconductors, aiming to solve the technical problems of high preparation cost and low purity in the prior art

Method used

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  • Preparation method of iron-arsenic compound and iron-based superconductor
  • Preparation method of iron-arsenic compound and iron-based superconductor
  • Preparation method of iron-arsenic compound and iron-based superconductor

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preparation example Construction

[0055] The invention provides a preparation method of a high-purity iron-arsenic compound, comprising the steps of:

[0056] S1, the iron powder and the arsenic powder are mixed in a molar ratio of 1-2:1-2 under the protection of an inert atmosphere to obtain a mixed powder.

[0057] Wherein, the purity of the iron powder and the arsenic powder are both ≥98%; the molar ratio of the iron powder and the arsenic powder can be specifically 1:1, 1:2 and 2:1; the iron powder and The mixing of the arsenic powder can be carried out in a volumetric flask; the mixing time of the iron powder and the arsenic powder is 24-32 hours.

[0058] S2, pressing the mixed powder under the protection of an inert atmosphere to obtain a formed mixed powder. The formed mixed powder is usually a powder compacted into a block.

[0059] Wherein, the inert atmosphere used in the step S1 and the step S2 may be nitrogen and / or argon.

[0060] The pressing pressure used in the pressing treatment is 20-30MPa...

Embodiment 1

[0095] 1. Use iron powder and arsenic powder with a purity of 98%, put them into a volumetric flask in a molar ratio of 1:1 in a glove box protected by an argon atmosphere, and then turn over and shake for 24 hours under the protection of argon gas. , to obtain a well-mixed powder;

[0096] 2. In the glove box protected by argon atmosphere, put the mixed powder in step 1 into the mold, and then put the mold into a large sample bag and seal it; take the sample bag out of the glove box, and then put the The mold of the sample bag and containing the mixed powder was pressed at 20Mpa and kept under pressure for 20 minutes; after the mixed powder was pressed and formed, it was sealed in a quartz tube in a glove box protected by an argon atmosphere, and evacuated to a vacuum Degree is 10 -3 Atmospheric pressure of Pa, the quartz tube was sealed with a high-temperature gun; after vacuum sealing, it was heat-treated in a tube furnace under argon protective atmosphere, specifically he...

Embodiment 2

[0100] 1. Use iron powder and arsenic powder with a purity of 98%, put them into a volumetric flask at a molar ratio of 1:2 in a glove box protected by an argon atmosphere, and then flip and shake for 24 hours under the protection of argon gas. In order to obtain a well-mixed mixed powder;

[0101] 2. In the glove box protected by argon atmosphere, put the mixed powder in step 1 into the mold, then put the mold into a large sample bag and seal it, take out the sample bag from the glove box, and then put the The mold of the sample bag and containing the mixed powder is pressed at 30Mpa and kept under pressure for 20 minutes; after the mixed powder is pressed and formed, it is sealed in a quartz tube in a glove box protected by an argon atmosphere, and evacuated to a vacuum Degree is 10 -3 Atmospheric pressure of Pa, the quartz tube was sealed with a high-temperature gun; after vacuum sealing, it was heat-treated in a tube furnace under an argon protective atmosphere, specifica...

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Abstract

The invention provides a preparation method of an iron-arsenic compound. The preparation method comprises the following steps: S1, mixing iron powder and arsenic powder in a molar ratio of (1-2): (1-2) under the protection of an inert atmosphere; s2, after mixing is completed, pressing treatment is conducted under the protection of inert atmosphere; s3, the formed mixed powder is subjected to calcination treatment at the temperature of 600-1000 DEG C under negative pressure, and iron-arsenic blocks are obtained; s4, the iron-arsenic block is ground, and iron-arsenic powder is obtained; and then sequentially carrying out acid pickling treatment with the concentration of 0.5-2 mol / L and acid pickling treatment with the concentration of 0.5-1 mol / L on the iron-arsenic powder to obtain the iron-arsenic compound. The method provided by the invention is a method for rapidly and efficiently preparing different iron-arsenic pure compound powder at low cost, and three pure iron-arsenic compounds can be obtained, so that the method is used for synthesizing an iron-arsenic-based high-purity material.

Description

technical field [0001] The invention relates to the technical field of iron-based superconductors, in particular to a preparation method of an iron-arsenic compound and an iron-based superconductor. Background technique [0002] As the second largest high-temperature superconductor after copper-based superconductors, the emergence of iron-based superconductors is of great significance and value for the development of high-temperature superconducting materials. Due to the high superconducting transition temperature, high upper critical magnetic field (Hca>100T), and high critical current density (J>106A / cm2) of iron-based superconductors, people began to pay attention to their possibility in practical applications. Especially in the field of superconducting wire, it has a good application prospect. Due to the infinite current-carrying capacity of superconductivity, the current-carrying capacity of superconducting wire is nearly 100 times that of ordinary wires, and bec...

Claims

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Application Information

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IPC IPC(8): H01B12/00C01G49/00C01G28/00
CPCH01B12/00C01G49/00C01G28/00Y02E40/60
Inventor 柴立元梁彦杰周艺伟彭聪赵飞平彭兵刘振兴周元付泽霖
Owner CENT SOUTH UNIV
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