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A method of niobium doping to increase the superconducting transition temperature of iron selenium

A technology of transition temperature and iron-selenium, which is applied in the field of niobium doping to increase the superconducting transition temperature of iron-selenium, can solve the problem that the superconducting performance is not significantly affected, and achieve the effect of increasing the superconducting transition temperature and simple preparation process

Active Publication Date: 2021-06-25
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in addition to Te and S doping can effectively achieve the equivalent substitution of Se sites to increase the superconducting transition temperature of FeSe, people have also tried many elements for the substitution of Fe sites, including Mg, Ba, Al, Ti, V, Cr ,Mn,Co,Ni,Sn,Cu,Zn,Ga,In,Mo,Ag,Si,Hg,Sb,Be and other metal and non-metal elements, however, the impact of these elements on superconducting properties is not significant, large Most of them even have an inhibitory effect; and no clear and definite conclusions have been drawn for the mechanism of Be, Mg, Cr, V, Sn, Ag, etc. to slightly improve the superconductivity of FeSe

Method used

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  • A method of niobium doping to increase the superconducting transition temperature of iron selenium
  • A method of niobium doping to increase the superconducting transition temperature of iron selenium
  • A method of niobium doping to increase the superconducting transition temperature of iron selenium

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) take by weighing 3.006g iron powder and 3.952g selenium powder (the purity of iron powder and selenium powder is 99.5%, the atomic percent Fe of iron powder and selenium powder: Se=1:0.93), fully in agate mortar Grind for 20 minutes to get a uniform mixed powder. The weighing process and grinding process are carried out in a glove box filled with high-purity argon; the ground mixed powder is pressed into tablets and vacuum-sealed into a quartz tube, and then placed in a tubular sintering furnace , Sintered at 600°C for 72h, and cooled to room temperature.

[0032] (2) Take out the sheet pre-sintered in the first step and place it in an agate mortar, fully grind it and add 0.1g of pure Nb powder (the purity of Nb powder is 99.5%, and the atomic percentage of Nb and FeSe is FeSe:Nb=1:0.02 ) and grind for another 30 minutes to mix well.

[0033] (3) The obtained mixed powder was compressed again and placed in a tube-type sintering furnace, vacuumed and filled with hig...

Embodiment 2

[0035] (1) take by weighing 1.503g iron powder and 2.018g selenium powder (the purity of iron powder and selenium powder is 99.5%, the atomic percentage Fe of iron powder and selenium powder: Se=1:0.95), fully in agate mortar Grind for 30 minutes to get a uniform mixed powder. The weighing process and grinding process are carried out in a glove box filled with high-purity argon; the ground mixed powder is pressed into tablets and vacuum-sealed into a quartz tube, and then placed in a tubular sintering furnace , Sintered at 650°C for 72h, and cooled to room temperature.

[0036] (2) Take out the sheet pre-sintered in the first step and place it in an agate mortar, fully grind it and add 0.1g of pure Nb powder (the purity of Nb powder is 99.5%, and the atomic percentage of Nb and FeSe is FeSe:Nb=1:0.04 ), and grind for another 40 minutes to mix well.

[0037] (3) The obtained mixed powder was compressed again and placed in a tube-type sintering furnace, vacuumed and filled with...

Embodiment 3

[0039](1) take by weighing 1.202g iron powder and 1.615g selenium powder (the purity of iron powder and selenium powder is 99.5%, the atomic percentage Fe of iron powder and selenium powder: Se=1:0.95), fully in agate mortar Grind for 30 minutes to get a uniform mixed powder. The weighing process and grinding process are carried out in a glove box filled with high-purity argon; the ground mixed powder is pressed into tablets and vacuum-sealed into a quartz tube, and then placed in a tubular sintering furnace , Sintered at 650°C for 72h, and cooled to room temperature.

[0040] (2) Take out the sheet pre-sintered in the first step and place it in an agate mortar, fully grind it and add 0.1g of pure Nb powder (the purity of Nb powder is 99.5%, and the atomic percentage of Nb and FeSe is FeSe:Nb=1:0.05 ), and grind for another 40 minutes to mix well.

[0041] (3) The obtained mixed powder was compressed again and placed in a tube-type sintering furnace, vacuumed and filled with ...

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Abstract

The present invention proposes a method for increasing the iron-selenium superconducting transition temperature by doping with niobium, mixing iron powder and selenium powder in an agate mortar, fully grinding to obtain a uniform mixed powder; then pressing the ground powder into tablets, and vacuum-sealed in a quartz tube; put the well-sealed quartz tube into a tubular sintering furnace, and obtain a FeSe block after sintering through a one-step sintering process, and then grind it into a powder in a mortar; mix pure Nb powder with the first step The obtained FeSe powder is ground and mixed according to the atomic percentage FeSe:Nb=1:x, x=0.02~0.08 to obtain a mixed powder; the mixed powder obtained in the second step is pressed into tablets, placed in a tube furnace, vacuumized and The tube is filled with high-purity argon for secondary sintering, and then cooled in a furnace to obtain a Nb-doped FeSe superconducting block. Nb doping can increase the superconducting transition temperature of FeSe to 13.6K.

Description

technical field [0001] The invention provides a method for increasing the iron-selenium superconducting transition temperature by doping niobium, which belongs to the technical field of superconducting material preparation. Background technique [0002] "11" system iron-based superconducting materials, including iron selenium (FeSe), iron selenium tellurium (FeSeTe), etc., do not contain highly toxic As elements, so they are almost non-toxic, and have simple processing and preparation methods and low raw material costs. Advantages; In addition, FeSe superconducting material is a system with the simplest structure in the iron-based superconducting family, which is easy to prepare and provides an experimental basis for the study of the special properties and superconducting mechanism of iron-based superconducting materials. It has become a new type of iron-based superconducting material. material of choice for conducting research. [0003] Since its discovery, for the study o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/547C04B35/622C04B35/64
Inventor 马宗青马庆爽郭倩颖刘永长余黎明李冲刘晨曦
Owner TIANJIN UNIV
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