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MgB2-based superconductor doped with heterogeneous phases of topological illuminants and preparation method of superconductor

A technology of luminous bodies and superconductors, applied in the direction of luminescent materials, chemical instruments and methods, etc.

Inactive Publication Date: 2018-08-10
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, so far, people have not found an effective method to increase MgB 2 The superconducting transition temperature of the material

Method used

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  • MgB2-based superconductor doped with heterogeneous phases of topological illuminants and preparation method of superconductor
  • MgB2-based superconductor doped with heterogeneous phases of topological illuminants and preparation method of superconductor
  • MgB2-based superconductor doped with heterogeneous phases of topological illuminants and preparation method of superconductor

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Experimental program
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Effect test

Embodiment 1

[0026] (1) Preparation of non-electroluminescent dopant Y by hydrothermal method 2 o 3 and Y 2 o 3 :Sm 3+ , the preparation process according to figure 1 As shown, during the preparation process, the rare earth elements were not added or the rare earth elements were replaced by Sm.

[0027] (2) Preparation of pure MgB by ex-situ solid-phase doping method 2 and Y 2 o 3 , Y 2 o 3 :Sm 3+ Doped MgB 2 Base superconductor (mass fraction is 2.0%).

[0028] (3) Using the liquid helium cryogenic system of Advanced Research Systems, the four-probe method was used to measure the curve of sample resistance changing with temperature: as Figure 4 shown. From Figure 4 As can be seen in the pure MgB 2 The measured superconducting transition temperature of the sample is 38-38.6K. Incorporate a non-electroluminescent dopant Y with a mass fraction of 2.0% 2 o 3 or Y 2 o 3 :Sm 3+ Finally, the superconducting transition temperatures are 35.4-36.2K and 35.8-36.6K, respectivel...

Embodiment 2

[0030] (1) Preparation of micron sheet m-Y by hydrothermal method 2 o 3 :Eu 3+ / Ag (the mass fraction of Ag is 1-8%): the preparation flow chart is as figure 1 shown. Dopant m-Y 2 o 3 :Eu 3+ The XRD and SEM images of / Ag figure 2 shown in a-b.

[0031] (2) Preparation of pure MgB by ex-situ solid-phase doping method 2 and m-Y 2 o 3 :Eu 3+ / Ag doped MgB 2 Base superconductor, the mass fraction of dopant is 2%.

[0032] (3) The X’Pert MPD PRO X-ray diffractometer of Holland PANalytical Co., Ltd. was used to carry out the phase analysis of the sample, and the results were as follows: image 3 shown. Test results showed that pure MgB 2 and m-Y 2 o 3 :Eu 3+ / Ag doped MgB 2 The main phase of the base superconductor is MgB 2 Phase, and all contain a small amount of MgO phase, the MgO phase is mainly derived from a small amount of oxygen mixed in from the environment during the preparation process. In addition, there is also Y in the phase diagram of the doped sa...

Embodiment 3

[0034] (1) Preparation of nanosheet n-Y by hydrothermal method 2 o 3 :Eu 3+ / Ag (the mass fraction of Ag is 5%): the preparation flow chart is as figure 1 shown. Dopant n-Y 2 o 3 :Eu 3+ / Ag's XRD and AFM picture figure 2 a and figure 2 c-d shown.

[0035] (2) Preparation of pure MgB by ex-situ solid-phase doping method 2 and n-Y 2 o 3 :Eu 3+ / Ag doped MgB 2 In the base superconductor, the mass fraction of the dopant is 0.1-2%.

[0036] (3) The X’Pert MPD PRO X-ray diffractometer of Holland PANalytical Co., Ltd. was used to carry out the phase analysis of the sample, and the results were as follows: image 3 shown. Test result is similar to embodiment two: pure MgB 2 and n-Y 2 o 3 :Eu 3+ / Ag doped MgB 2 The main phase of the base superconductor is MgB 2 phase, both contain a small amount of MgO phase, and there is also Y in the phase diagram of the doped sample 2 o 3 phase existence. At the same time, due to the low content of Eu and Ag elements in the...

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Abstract

The invention relates to a MgB2-based superconductor doped with heterogeneous phases of topological illuminants and a preparation method of the superconductor. The topological illuminants are used fordoping to change the superconducting transition temperature of the MgB2-based superconductor. A hydrothermal method is adopted for preparing the three topological illuminants including the micrometersheet m-Y2O3:Eu3+ / Ag, the nanosheet n-Y2O3:Eu3+ / Ag and the nanosheet n-Y2O3:Eu3+ / AgCl. A heterotopic doping method is used for preparing the MgB2-based superconductor doped with the heterogeneous phases of the topological illuminants. The change of the superconducting transition temperature of a doped sample is studied by changing the size of dopants, the content of Ag, the mass fraction of the dopants and the like. It is found in experiments that when n-Y2O3:Eu3+ / AgCl is used as the dopant and the doping concentration is 1%, the transition temperature of the doped MgB2-based superconductor is higher than that of a corresponding pure MgB2 sample.

Description

technical field [0001] The invention relates to MgB doped with a heterogeneous phase of a topological light emitter 2 Based superconductor and preparation method thereof, the intelligent superstructure superconductor has excellent characteristics, such as simple preparation method and relatively high critical transition temperature. Background technique [0002] In 2001, MgB 2 superconductivity was discovered. MgB 2 The structure is simple, easy to prepare, and has a relatively high critical transition temperature (T C =39.0K), these excellent properties make MgB 2 It has great practical application prospect. Currently, a great challenge is how to further increase the MgB 2 the T C For this reason, people have carried out a lot of research work and tried various methods. However, so far, people have not found an effective method to increase MgB 2 The superconducting transition temperature of the material. [0003] Some recent studies have shown that doping luminesc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/622C04B35/626C09K11/78
CPCC04B35/58057C04B35/622C04B35/62605C04B2235/3224C04B2235/3225C04B2235/96C09K11/7701C09K11/7769C09K11/7787
Inventor 赵晓鹏李勇波陈宏刚陈国维
Owner NORTHWESTERN POLYTECHNICAL UNIV
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