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Method for improving FeSe superconducting transition temperature by adding Mg

A transition temperature, superconducting technology, applied in the field of superconductivity, to promote development, improve superconducting transition temperature, the technology is simple and easy to implement

Active Publication Date: 2014-08-13
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Previous studies on the doping of conventional metal components such as Co, Ni, Cu, Mn, Zn, Mo, Cr, etc. showed that the addition of these components suppressed the superconducting transition temperature to a certain extent.

Method used

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  • Method for improving FeSe superconducting transition temperature by adding Mg
  • Method for improving FeSe superconducting transition temperature by adding Mg
  • Method for improving FeSe superconducting transition temperature by adding Mg

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Mix and grind Fe powder and Se powder in an agate mortar or planetary ball mill for 30 minutes according to the atomic ratio of Fe:Se=1:0.90, then make flakes under a pressure of 5MPa, and finally put the flakes into high temperature difference Scanning calorimeter or tubular sintering furnace for argon protection atmosphere sintering, the heating rate is 20°C / min. room temperature.

[0019] The sintered FeSe block was taken out and ground into powder again. Then Mg powder and FeSe powder were mixed according to the atomic ratio of 0.4:1, and thoroughly ground for 30 minutes in an agate mortar or planetary ball mill. Then make thin slices under a pressure of 5MPa, and finally put the thin slices into a high-temperature differential scanning calorimeter, and under the protection of flowing high-purity argon, heat up to 750°C at a rate of 20°C / min. Keep warm for 0.5 hours, then cool down to room temperature at a cooling rate of 40°C / min, and take out the sintered sample...

Embodiment 2

[0022] Mix and grind Fe powder and Se powder in an agate mortar or planetary ball mill for 60 minutes according to the atomic ratio of Fe:Se=1:1, then make thin slices under a pressure of 10MPa, and finally put the thin slices into high temperature difference Scanning calorimeter or tubular sintering furnace for argon protection atmosphere sintering, the heating rate is 40°C / min, after rising to 700°C, keep sintering at this temperature for 18 hours, and then cool down to room temperature.

[0023] The sintered FeSe block was taken out and ground into powder again. Then Mg powder and FeSe powder were mixed according to the atomic ratio of 0.2:1, and fully ground in an agate mortar or planetary ball mill for 60 minutes. Then make thin slices under a pressure of 10MPa, and finally put the thin slices into a high-temperature differential scanning calorimeter. Keep warm for 0.5 hours, then cool down to room temperature at a cooling rate of 40°C / min, and take out the sintered sam...

Embodiment 3

[0026] Mix and grind Fe powder and Se powder in an agate mortar or planetary ball mill for 20 minutes according to the atomic ratio of Fe:Se=1:1.05, then make flakes under a pressure of 2MPa, and finally put the flakes into high temperature difference Scanning calorimeter or tubular sintering furnace for argon protective atmosphere sintering, heating rate 10 ℃ / min, after rising to 600 ℃, keep sintering at this temperature for 48 hours, and then cool down to 10 ℃ / min room temperature.

[0027] The sintered FeSe block was taken out and ground into powder again. Then Mg powder and FeSe powder were mixed according to the atomic ratio of 1:1, and fully ground in an agate mortar or planetary ball mill for 20 minutes. Then make thin slices under a pressure of 2MPa, and finally put the thin slices into a high-temperature differential scanning calorimeter. Keep warm for 1 hour, then cool down to room temperature at a cooling rate of 10°C / min, and take out the sintered sample.

...

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Abstract

The invention relates to a method for improving the FeSe superconducting transition temperature by adding Mg. The method comprises the following steps of: milling Fe powder and Se powder in an agate mortar or a planetary ball mill at the atomic ratio of Fe:Se=1: (0.90-1.05), pressing the mixture to obtain a thin sheet, placing the thin sheet into a high temperature differential scanning calorimeter or a tubular sintering furnace, sintering the thin sheet in a thermally insulating mode at 600-700 DEG C for 18-48 hours, cooling the sintered thin sheet to room temperature, again milling the sintered FeSe block into powder, milling the Mg powder and the FeSe powder in the agate mortar or the ball mill at the atomic ratio of (0.2-1):1, pressing the mixed powder to obtain the thin sheet, sintering the thin sheet in the high temperature differential scanning calorimeter or the tubular sintering furnace in the thermally insulating mode at 700-800 DEG C for 0.5-1 hour, and cooling the sintered thin sheet to room temperature, wherein the MgSe coexists with the unreacted FeSe to influence the lattice constant of the FeSe so that the superconducting transition temperature of the FeSe is increased from 9.8K to 12.1K, and the increase range is above 20%.

Description

technical field [0001] The invention relates to a method for synthesizing FeSe superconducting material with higher superconducting transition temperature by adding Mg and sintering, which is a new technology for synthesizing iron-based superconducting material with better superconducting performance, and belongs to the field of superconducting technology. Background technique [0002] In February 2008, the Hosono group of Tokyo Institute of Technology reported that doping F elements in the LaFeAsO system can achieve a superconducting transition temperature as high as 26K. Due to the strong ferromagnetism of iron, it is difficult to imagine the existence of superconductivity in iron-based compounds. , this breakthrough immediately triggered an upsurge in the search for high-temperature superconducting materials. Subsequently, many research groups at home and abroad have successively reported a series of layered iron-based compounds with superconductivity through pressurizati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L39/12C04B35/547C04B35/64
Inventor 马宗青刘永长陈宁蔡奇
Owner TIANJIN UNIV
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