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Preparation method of high-density Fe(Se,Te) superconducting material

A superconducting material and high-density technology, applied in the manufacture/processing of superconductor devices, superconductor components, etc., can solve problems such as consumption, poor sintering efficiency, and low density, and achieve short process flow, strong repeatability, and avoid melting effect

Inactive Publication Date: 2015-09-30
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] And the most important problem that existing technology exists in Fe(Se, Te) superconducting material preparation process is: because Fe(Se, Te) has two kinds of crystal structures, one is hexagonal phase, wherein, Fe:(Se, Te) ratio is slightly lower than 1:1, due to the limitation of the structure, the hexagonal phase Fe(Se,Te) does not have superconducting properties; the other is the tetragonal phase, in which -Fe(Se,Te)-is a sheet shape distribution, that is, it becomes a superconducting layer structure similar to -FeAs- and -CuO-, so the superconducting transition occurs around 14K
At present, the traditional sintering method or the method of sintering the precursor powder after ordinary ball milling can only increase the superconducting phase content by increasing the sintering temperature and prolonging the sintering time, and the sintering efficiency is poor. This method not only consumes A large amount of energy, and the best tetragonal phase content can only reach below 80%, and the density of the obtained sample is extremely low, and the low core filament density has a great negative impact on the preparation of the superconducting wire. In this case, The superconducting phase is difficult to achieve Unicom, and the current-carrying performance of the material is low. Therefore, it is urgent to develop a new method for preparing Fe(Se,Te) superconducting materials in the prior art, and it is necessary for the follow-up high-performance Fe(Se,Te) superconducting The exploration of the superconducting mechanism of wires and Fe-based superconducting materials is of great significance

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  • Preparation method of high-density Fe(Se,Te) superconducting material
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  • Preparation method of high-density Fe(Se,Te) superconducting material

Examples

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Embodiment 1

[0033] This embodiment includes the following steps:

[0034] Step 1. In a glove box filled with an inert gas, place the mixed powder in a vacuum ball mill jar, then seal the vacuum ball mill jar and take it out; the mixed powder is composed of iron powder with a molar ratio of 1.1:0.5:0.5, Selenium powder and tellurium powder are mixed; the iron powder is reduced iron powder, the mass purity of the iron powder is not less than 99%, the mass purity of the selenium powder is not less than 99%, and the mass purity of the tellurium powder is Purity not less than 99%;

[0035] Step 2. Place the vacuum ball milling tank containing the mixed powder in step 1 in a high-energy ball mill for high-energy ball milling. The specific process is:

[0036] Step 201: Under the condition that the rotating speed of the high-energy ball mill is 1740r / min, the mixed powder is subjected to high-energy ball milling treatment for 10 minutes, and then the vacuum ball milling tank is taken out and so...

Embodiment 2

[0042] This embodiment includes the following steps:

[0043] Step 1. In a glove box filled with an inert gas, place the mixed powder in a vacuum ball mill jar, then seal the vacuum ball mill jar and take it out; the mixed powder is composed of iron powder with a molar ratio of 1.2:0.5:0.5, Selenium powder and tellurium powder are mixed; the iron powder is reduced iron powder, the mass purity of the iron powder is not less than 99%, the mass purity of the selenium powder is not less than 99%, and the mass purity of the tellurium powder is Purity not less than 99%;

[0044] Step 2. Place the vacuum ball milling tank containing the mixed powder in step 1 in a high-energy ball mill for high-energy ball milling. The specific process is:

[0045] Step 201: Under the condition that the speed of the high-energy ball mill is 1800r / min, the mixed powder is high-energy ball milled for 20 minutes, and then the vacuum ball mill tank is taken out and soaked in liquid nitrogen to cool; Th...

Embodiment 3

[0051] This embodiment includes the following steps:

[0052] Step 1. In a glove box filled with an inert gas, place the mixed powder in a vacuum ball mill jar, then seal the vacuum ball mill jar and take it out; the mixed powder is composed of iron powder with a molar ratio of 1.0:0.3:0.7, Selenium powder and tellurium powder are mixed; the iron powder is reduced iron powder, the mass purity of the iron powder is not less than 99%, the mass purity of the selenium powder is not less than 99%, and the mass purity of the tellurium powder is Purity not less than 99%;

[0053] Step 2. Place the vacuum ball milling tank containing the mixed powder in step 1 in a high-energy ball mill for high-energy ball milling. The specific process is:

[0054] Step 201: Under the condition that the rotating speed of the high-energy ball mill is 1500r / min, the mixed powder is subjected to high-energy ball milling treatment for 30 minutes, and then the vacuum ball mill tank is taken out and soake...

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Abstract

The invention discloses a preparation method of a high-density Fe(Se,Te) superconducting material. The method comprises steps as follows: step one, ferrous powder, selenium powder and tellurium powder are mixed to form mixed powder, and the mixed powder is placed in a vacuum ball milling tank; step two, the mixed powder is subjected to high-energy ball milling; step three, the mixed powder is pressed, and a Fe(Se,Te) green body is obtained; step four, the Fe(Se,Te) green body is sintered, and the Fe(Se,Te) superconducting material is obtained. The mole ratio of the ferrous powder to the selenium powder to the tellurium powder in the mixed powder is adjusted and controlled, the Fe content in the generated tetragonal phase Fe(Se, Te) is optimized, the mixed powder is subjected to high-energy ball milling in shorter time by means of a high-energy ball mill, limit to the reaction rate in the diffusion process during sintering is eliminated, holes formed after melting of the selenium powder are avoided, and the high-density Fe(Se,Te) superconducting material with high superconducting phase content is obtained.

Description

technical field [0001] The invention belongs to the technical field of superconducting material preparation, and in particular relates to a method for preparing a high-density Fe (Se, Te) superconducting material. Background technique [0002] In 2008, the Japanese Hosono research group discovered LaO with a critical temperature of 26K 1-x f x FeAs iron-based high-temperature superconducting materials, followed by Fe-based high-temperature superconducting materials (FHTS) developed rapidly. At present, according to different barrier layers, it can be divided into four main systems, namely "1111" system (such as LaFeAsOF), "122" system (such as BaFeAsOF 2 As 2 ), "111" system (such as LiFeAs) and "11" system (such as FeSe). Similar to high-temperature copper oxide superconductors (CHTS), the crystal structure of FHTS is a layered structure, with -FeAs-layer (or -FeSe-layer) as the superconducting layer. [0003] The main reasons for the rapid development of FHTS are as f...

Claims

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Application Information

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IPC IPC(8): H01L39/24H01L39/12
Inventor 刘吉星李成山张胜楠马小波周廉
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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