Method for improving Fe-Se superconducting transition temperature by Nb doping

A transition temperature, iron selenium technology, applied in the field of niobium doping to improve iron selenium superconducting transition temperature, can solve the problem that the influence of superconducting performance is not significant, and achieve the effect of increasing superconducting transition temperature and simple preparation process

Active Publication Date: 2019-05-07
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 oth

Method used

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  • Method for improving Fe-Se superconducting transition temperature by Nb doping
  • Method for improving Fe-Se superconducting transition temperature by Nb doping
  • Method for improving Fe-Se superconducting transition temperature by Nb doping

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Weigh 3.006g iron powder and 3.952g selenium powder (the purity of iron powder and selenium powder are both 99.5%, the atomic percentage of iron powder and selenium powder Fe:Se=1:0.93), fully in an agate mortar Grind for 20 minutes to obtain a uniformly mixed mixed powder. The weighing process and the grinding process are carried out in a glove box filled with high-purity argon; the ground mixed powder is compressed into a quartz tube and placed in a tube sintering furnace. , Sintered at 600 ℃ 72h, the furnace is cooled to room temperature.

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

[0033] (3) The obtained mixed powder is compressed again and placed in a tube sintering furnace, evacuated and filled with high-purity argon gas for sintering, sintered at 600°C f...

Embodiment 2

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

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

[0037] (3) The obtained mixed powder is compressed again and placed in a tube sintering furnace, evacuated and filled with high-purity argon gas for sintering...

Embodiment 3

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

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

[0041] (3) The obtained mixed powder is compressed again and placed in a tube sintering furnace, evacuated and filled with high-purity argon gas for sinte...

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Abstract

The invention provides a method for improving Fe-Se superconducting transition temperature by Nb doping. The method includes: mixing iron powder and selenium powder in an agate mortar, and performingfull grinding to obtain uniform mixed powder; then pressing the ground powder into tablets and conducting vacuum sealing in a quartz tube; putting the well sealed quartz tube into a tubular sinteringfurnace, and conducting sintering by one-step sintering process to obtain an FeSe block material, and then performing grinding into powder in a mortar; subjecting pure Nb powder and the FeSe powder obtained in step one to grinding and mixing according to an atomic percentage ratio of x:1, x=0.02-0.08, thus obtaining mixed powder; and subjecting the mixed powder obtained in the second step to tabletting, placing the product in a tubular furnace, conducting vacuum pumping, and introducing high purity argon into the tube for secondary sintering, and then carrying out furnace cooling so as to obtain an Nb-doped FeSe superconducting block. Nb doping can increase the superconducting transition temperature of FeSe to 13.6K.

Description

Technical field [0001] The invention proposes a method for increasing the iron-selenium superconducting transition temperature by doping with niobium, and 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., because they do not contain highly toxic As elements, they are almost non-toxic, and have simple processing and preparation methods and low raw material costs. Advantages; In addition, FeSe superconducting material is the simplest system in the iron-based superconductor family, easy to prepare, and provides an experimental basis for the study of the special properties and superconducting mechanism of iron-based superconductors. It has become a new type of iron-based superconductor. The material of choice for guided research. [0003] Since its discovery, the research on FeSe superconductors, further increasin...

Claims

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Application Information

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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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