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Method for exciting superconducting performance of Ge-doped FeSeTe single crystal material

A technology of superconducting properties, single crystal materials, applied in the direction of polycrystalline material growth, single crystal growth, single crystal growth, etc. problems, to achieve the effect of reducing impurity content, improving uniformity, and shortening phase formation time

Inactive Publication Date: 2022-07-29
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the current doping that replaces the Fe site inhibits the superconductivity, and even makes the material lose the superconductivity, such as Al, Ga, Ti, V, Cr, Mn, Co, Ni, Cu, Ge, etc. Wait
[0004] At present, in order to solve the problem of unsatisfactory superconducting properties, some research methods have been used, such as the pressure method, but this method has high requirements on the environment and equipment, and is not suitable for large-scale applications; another example is the use of iron-based materials prepared by soaking in special solvents , so that the inhibitory components are dissolved out to stimulate superconductivity, but this method cannot guarantee that the beneficial substances will not dissolve in the solvent, and the principle is difficult to explain
At present, there is an urgent need for an effective method suitable for large-scale production, low environmental requirements and equipment requirements, and simple in principle to solve the problem of partial doping substances inhibiting the superconductivity of iron-based materials.

Method used

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  • Method for exciting superconducting performance of Ge-doped FeSeTe single crystal material
  • Method for exciting superconducting performance of Ge-doped FeSeTe single crystal material
  • Method for exciting superconducting performance of Ge-doped FeSeTe single crystal material

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Embodiment 1

[0025] A preparation method of FeSeTe single crystal material, comprising the following steps:

[0026] Step 1: fully grind the iron powder, selenium powder and tellurium powder for 30 minutes in an inert gas atmosphere, and mix them according to the molar ratio of iron powder:selenium powder:tellurium powder as 1:1-y:y, y=0.3. The uniformly mixed powder was placed in a 0.5 cm mold for tableting, and the tableting time was 3 minutes. Among them, the purity of iron powder is ≥99.8%, the purity of selenium powder is ≥99.99%, and the purity of tellurium powder is ≥99.99%.

[0027] The obtained mixed powder embryo body is placed in a crucible, and then the crucible is placed in a quartz tube, and the quartz tube is subjected to vacuum sealing treatment, and the vacuum degree is 2.5 Pa. The vacuum-treated quartz tube is placed in a tube furnace for sintering. The temperature was raised from room temperature to 850°C at a rate of 1°C / min, and kept for 50 hours; then, the temperatu...

Embodiment 2

[0032] A method for exciting the superconductivity of Ge-doped FeSeTe single crystal material, comprising the following steps:

[0033] Step 1: Fully grind the iron powder, germanium powder, selenium powder and tellurium powder for 50 minutes in an inert gas atmosphere. According to the molar ratio of iron powder: germanium powder: selenium powder: tellurium powder, it is 1-x: x: 1-y : y is mixed, x=0.03, y=0.35. The uniformly mixed powder was placed in a 0.8 cm mold for tableting, and the tableting time was 5 minutes. Among them, the purity of iron powder is ≥99.8%, the purity of germanium powder is ≥99.99%, the purity of selenium powder is ≥99.99%, and the purity of tellurium powder is ≥99.99%.

[0034] The obtained mixed powder embryo body was placed in a crucible, and then the crucible was placed in a quartz tube, and the quartz tube was subjected to vacuum sealing treatment, and the vacuum degree was 2.3 Pa. The vacuum-treated quartz tube is placed in a tube furnace for...

Embodiment 3

[0043] A method for exciting the superconductivity of Ge-doped FeSeTe single crystal material, comprising the following steps:

[0044] Step 1: fully grind iron powder, germanium powder, selenium powder and tellurium powder for 70 minutes in an inert gas atmosphere, the molar ratio of iron powder: germanium powder: selenium powder: tellurium powder is 1-x: x: 1-y: y, x=0.05, y=0.4. The uniformly mixed powder was placed in a 1 cm mold for tableting, and the tableting time was 8 minutes. Among them, the purity of iron powder is ≥99.8%, the purity of germanium powder is ≥99.99%, the purity of selenium powder is ≥99.99%, and the purity of tellurium powder is ≥99.99%.

[0045] The prepared mixed powder embryo body is placed in a crucible, and then the crucible is placed in a quartz tube, and the quartz tube is subjected to vacuum sealing treatment, and the vacuum degree is 2 Pa. The vacuum-treated quartz tube is placed in a tube furnace for sintering. The temperature was raised ...

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Abstract

The invention discloses a method for exciting the superconducting performance of a Ge-doped FeSeTe single crystal material. The preparation method comprises the following steps: 1) fully grinding iron powder, germanium powder, selenium powder and tellurium powder in an inert gas atmosphere, mixing in proportion, tabletting the uniformly mixed powder, placing the prepared mixed powder blank in a crucible, placing the crucible in a quartz tube, performing vacuum tube sealing treatment on the quartz tube, and sintering to obtain a Ge-doped FeSeTe single crystal sample; and 2) grinding the prepared sample, loading the ground sample into a mold, tabletting, placing the pressed blank into a crucible, placing the crucible into a quartz tube, performing vacuum tube sealing treatment on the quartz tube, sintering, taking out and quenching. According to the method, the superconducting performance of the Ge-doped FeSeTe single crystal material is successfully excited, and further technical support is provided for research on the principle of a FeSeTe superconductor.

Description

technical field [0001] The invention belongs to the field of preparation methods of superconducting materials, in particular to a method for exciting the superconducting properties of Ge-doped FeSeTe single crystal materials. Background technique [0002] Iron-based superconductors, first discovered in 2008, have become the latest research hotspot in the field of high-temperature superconductivity. At present, iron-based superconductors with potential applications all contain the highly toxic element arsenic (As), which brings significant obstacles to their preparation, storage, application and environmental protection. Among all iron-based superconductors that have been discovered so far, FeSe not only has the simplest structure, but also does not contain the highly toxic element As, so it is highly valued by the scientific and industrial circles. However, the critical temperature and current-carrying properties of FeSe-based superconductors are relatively insufficient, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B1/02C30B1/10C30B29/52
CPCC30B29/52C30B1/10C30B1/02
Inventor 赵勇刘禹彤周大进
Owner FUJIAN NORMAL UNIV