Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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
View PDF6 Cites 4 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Superconducting transition temperatureaaaaaaaaaa
Superconducting transition temperatureaaaaaaaaaa
Superconducting transition temperatureaaaaaaaaaa
Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com