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Method for improving superconducting performance of Sn-added FeSe1/2Te1/2 superconductor

A superconducting performance and superconducting technology, applied in the field of superconducting, can solve the problem of unfavorable hexagonal superconducting equivalence, achieve the effect of simple and easy preparation method, promote development, and optimize preparation process

Active Publication Date: 2015-03-25
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also found in FeSe 0.5 Te 0.5 The unfavorable hexagonal superconducting phase is often present in sintered samples

Method used

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  • Method for improving superconducting performance of Sn-added FeSe1/2Te1/2 superconductor

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Effect test

Embodiment 1

[0019] Mix Fe, Se, and Te powders in an agate mortar at an atomic ratio of 1:0.5:0.5, grind for 30 minutes, and then make thin slices under a pressure of 6MPa, and finally put the thin slices into a tube with an argon protective atmosphere After sintering in a type furnace, the temperature was raised to 500°C at a rate of 10°C / min, kept at this temperature for sintering for 18 hours, and then cooled down to room temperature at a cooling rate of 40°C / min. The sintered block is taken out and ground into powder again. Then the Sn powder and FeSe 0.5 Te 0.5 The powders were mixed in a weight ratio of 0.05:1 and thoroughly ground in an agate mortar for 20 minutes. Then make thin slices under a pressure of 6MPa, and finally put the thin slices into a high-temperature differential scanning calorimeter. Keep it warm for 5 hours, then drop to room temperature at a cooling rate of 20°C / min. from figure 2 It can be seen that in this sample (x=0.05), the intensity of the diffraction...

Embodiment 2

[0021] Mix Fe, Se, and Te powders in an agate mortar at an atomic ratio of 1:0.5:0.5, grind for 30 minutes, and then make thin slices under a pressure of 6MPa, and finally put the thin slices into a tube sintering furnace for argon gas Protective atmosphere sintering with a heating rate of 20°C / min. After rising to 550°C, keep the temperature for sintering for 20 hours, and then cool down to room temperature at a cooling rate of 20°C / min. The sintered block is taken out and ground into powder again. Then the Sn powder and FeSe 0.5 Te 0.5 Powders were mixed in a weight ratio of 0.05:1 and ground thoroughly in an agate mortar for 30 minutes. Then make thin slices under a pressure of 6MPa, and finally put the thin slices into a high-temperature differential scanning calorimeter. Keep it warm for 5 hours, then cool down to room temperature at a cooling rate of 40°C / min. from image 3 It can be seen that in this sample (x=0.05), the layered superconducting crystal grows obviou...

Embodiment 3

[0023]Mix Fe, Se, and Te powders in an agate mortar at an atomic ratio of 1:0.5:0.5, grind for 20 minutes, and then make thin slices under a pressure of 8MPa, and finally put the thin slices into a tube with an argon protective atmosphere After sintering in a type furnace, the temperature was raised to 600°C at a rate of 40°C / min, kept at this temperature for sintering for 24 hours, and then cooled down to room temperature at a cooling rate of 20°C / min. The sintered block is taken out and ground into powder again. Then the Sn powder and FeSe 0.5 Te 0.5 The powders were mixed in a weight ratio of 0.05:1 and thoroughly ground in an agate mortar for 20 minutes. Then make thin slices under a pressure of 8 MPa, and finally put the thin slices into a high-temperature differential scanning calorimeter. Insulate for 10 hours, then cool down to room temperature at a cooling rate of 10°C / min. from Figure 4 It can be seen from the label in the lower right corner that the zero resis...

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Abstract

The invention relates to a method for improving the superconducting performance of a Sn-added FeSe0.5Te0.5 superconductor. The method comprises the steps of mixing Sn powder and FeSe0.5Te0.5 powder in a weight ratio of 0.05: 1, and sufficiently grinding the mixture in an agate mortar for 20-30 minutes; and then preparing into a flake under the pressure of 6-8MPa, finally putting the flake into a high-temperature differential scanning calorimeter, heating to 600 DEG C under the protection of flowing high-purity argon, preserving the heat for 5-10 hours, and cooling to room temperature. A fact that a Sn-Se-Te liquid phase generated by reaction between Sn and FeSe0.5Te0.5 can accelerate the transformation from a non-superconducting phase to a superconducting phase is discovered for the first time and is favorable for forming a superconducting laminar structure so that the superconducting transition temperature of the structure is finally significantly improved, thus providing an important clue for optimizing a preparation process of an iron-based superconductor, illuminating an iron-based superconducting mechanism and promoting the development of the superconducting theory.

Description

technical field [0001] The invention relates to the preparation of FeSe with more superconducting phases and higher superconducting transition temperature by Sn addition and secondary sintering 0.5 Te 0.5 (FeSe 1 / 2 Te 1 / 2 ) method for superconducting materials, belonging to the field of superconducting technology, in particular related to the addition of Sn to FeSe 0.5 Te 0.5 A method for improving superconducting properties of superconductors. Background technique [0002] The iron-based superconductor in 2008 was another milestone discovery following the traditional cuprate superconductor. The simple and nontoxic FeSe provides a facile route to elucidate the mechanism of superconductivity. [0003] Studies have shown that Te doping can significantly improve the superconductivity of iron selenium compounds, FeSe 0.5 Te 0.5 The superconducting transition temperature is as high as 15K. The research on Co, Ni, Cu, Mn, Li, Ag, Cr and other metal dopants has reached pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/00
CPCC01B19/00
Inventor 马宗青陈宁刘永长蔡奇
Owner TIANJIN UNIV
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