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Preparation method for silver-doped iron-based superconductor

An iron-based superconductor, silver-doped technology, applied in the use of superconductor elements, superconducting/high-conducting conductors, cable/conductor manufacturing, etc., can solve the problems of large brittleness, difficult forging, drawing, etc.

Inactive Publication Date: 2013-02-13
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the iron-based superconductor belongs to the ceramic structure, which is very brittle, and it is difficult to forge and draw it into the desired shape after being fired.

Method used

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  • Preparation method for silver-doped iron-based superconductor
  • Preparation method for silver-doped iron-based superconductor
  • Preparation method for silver-doped iron-based superconductor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: 5% Ag doped SmO 0.7 f 0.3 Preparation of FeAs Superconductor

[0020] Step 1: Preparation of initial powder

[0021] Sm powder and As powder were weighed according to the molar ratio of 1:1.03 and mixed under Ar protection atmosphere. The mixed Sm powder and As powder were packaged in a quartz tube for sintering, and the vacuum degree was 10 -6 Pa, the heat treatment process is as follows: from room temperature to 400°C, the heating rate is 5°C / min; from 400°C to 600°C, the heating rate is 1°C / min; at 600°C for 5 hours; from 600°C to 900°C, the heating rate is 1°C / min; heat preservation at 900°C for 10 hours; finally cool the furnace to room temperature.

[0022] Step 2: 5% Ag-doped SmO 0.7 f 0.3 Preparation of FeAs Superconductor

[0023] In a glove box protected by high-purity argon gas, SmAs powder, Fe powder, Fe 2 o 3 Powder, FeF 3 The powder is mixed according to the ratio of 30:13:7:3.6, and 5% silver is added; then it is fully ground; it is ...

Embodiment 2

[0026] Example 2: 5% Ag doped CeO 0.8 f 0.2 Preparation of FeAs Superconductor

[0027] Step 1: Preparation of initial powder

[0028] Ce powder and As powder were weighed according to the molar ratio of 1:1 and mixed under Ar protection atmosphere. The mixed Ce powder and As powder are packaged in a high-vacuum quartz tube for sintering, and the vacuum degree of the quartz tube is 10 -4 Pa, the heat treatment process is as follows: room temperature-400°C, heating rate is 5°C / min; 400°C-600°C, heating rate is 5°C / min; 600°C for 10 hours; 600°C-900°C heating rate is 5°C / min; heat preservation at 900°C for 20 hours; finally cool the furnace to room temperature.

[0029] Step 2: 5% Ag doped CeO 0.8 f 0.2 Preparation of FeAs Superconductor

[0030] In a glove box protected by high-purity argon gas, CeAs powder, Fe powder, Fe 2 o 3 Powder, FeF 3 The powder is mixed according to the ratio of 30:12:8:2.4, and 5% silver powder is added, and then fully ground; it is pressed ...

Embodiment 3

[0031] Example 3: 10% Ag doped NdO0.7 f 0.3 Preparation of FeAs Superconductor

[0032] Step 1: Preparation of initial powder

[0033] Weigh the Nd powder and As powder according to the molar ratio of 1:1.1 and mix them under Ar protective atmosphere; package the mixed Nd powder and As powder in a high-vacuum quartz tube for heat treatment, and the vacuum degree of the quartz tube is 10 -5 Pa. The heat treatment process is as follows: from room temperature to 400°C, the heating rate is 5°C / min; from 400°C to 600°C, the heating rate is 3°C / min; at 600°C for 5 hours; from 600°C to 900°C, the heating rate is 3°C / min ; 900 ° C for 20 hours; Finally, the furnace was cooled to room temperature.

[0034] Step 2: 10% Ag-doped NdO 0.7 f 0.3 Preparation of FeAs Superconductor

[0035] In a glove box protected by high-purity argon gas, NdAs powder, Fe powder, Fe 2 o 3 Powder, FeF 3 The powder is mixed according to the ratio of 30:13:7:3.9, and 10% silver powder is added, and the...

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Abstract

A preparation method for a silver-doped iron-based superconductor belongs to the technical field of iron-based superconductive materials. The preparation method includes the following steps: under argon shield, rare earth and As powder are packaged in a quartz tube and heated to prepare LnAs powder; in a glove box with argon shield, LnAs and Fe powder, Fe2O3 powder and FeF3 powder are blended according to the molar ratio of 3:(1 plus x):(1 minus x):(1.1 to 1.5)x (x is greater than 0 and less than 0.6), silver is added, and the materials are ground and pressed into the shape of a sheet; annealing is carried out under high vacuum, more specifically, the heating rate is 1 DEG C / min to 5 DEG C / min from 0 DEG C to 600 DEG C, the heating rate is 1 DEG C / min to 3 DEG C / min from 600 DEG C to 900 DEG C, the temperature of 900 DEG C is kept for 5 to 15 hours, the heating rate is 1 DEG C / min to 3 DEG C / min from 900 DEG C to a temperature from 1100 DEG C to 1200 DEG C, and the temperature from 1100 DEG C to 1200 DEG C is kept for 20 to 30 hours; and the furnace is cooled to the room temperature. By adding the silver, the method can enhance the electromagnetic properties and practicability of the iron-based superconductor.

Description

technical field [0001] The invention relates to a method for preparing a high-performance iron-based superconductor, in particular to a silver-doped LnO 1-x f x The method for FeAs (Ln=La, Ce, Pr, Nd, Sm, Eu, etc.) iron-based superconductor belongs to the technical field of iron-based superconducting materials. Background technique [0002] Since their discovery, iron-based superconductors have attracted widespread attention because of their excellent properties. With the traditional low-temperature superconductor Nb 3 Compared with Sn and high-temperature YBCO-coated superconducting materials and Bi-based superconducting wire strips, iron-based superconductors have a higher service temperature (40K-55K); in this temperature range and high magnetic field (> 3T) conditions, its superconductor The conductivity has reached or even surpassed that of the traditional low-temperature superconducting materials currently in use. Moreover, the doping of silver can improve the w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B13/00H01B12/00
CPCY02E40/64Y02E40/60
Inventor 索红莉闫镔杰刘志勇
Owner BEIJING UNIV OF TECH
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