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Topological luminophore heterogeneously doped mgb 2 Base superconductor and its preparation method

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

Inactive Publication Date: 2021-02-19
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • 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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  • Topological luminophore heterogeneously doped mgb <sub>2</sub> Base superconductor and its preparation method
  • Topological luminophore heterogeneously doped mgb <sub>2</sub> Base superconductor and its preparation method
  • Topological luminophore heterogeneously doped mgb <sub>2</sub> Base superconductor and its preparation method

Examples

Experimental program
Comparison scheme
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 MgB doped with a heterogeneous phase of a topological light emitter 2 Based superconductor and its preparation method, using topological emitter doping to change MgB 2 The superconducting transition temperature of the base superconductor. The present invention adopts hydrothermal method to prepare three kinds of topological illuminants: micron sheet m-Y 2 O 3 :Eu 3+ / Ag, nanosheet n‑Y 2 O 3 :Eu 3+ / Ag and n-Y 2 O 3 :Eu 3+ / AgCl. Heterogeneous phase-doped MgB prepared by ex-situ doping 2 base superconductor. By changing the size of the dopant, the content of Ag and the mass fraction of the dopant, the change of the superconducting transition temperature of the doped sample was studied. In experiments, it was found that when using n‑Y 2 O 3 :Eu 3+ / AgCl as the dopant, and when the doping concentration is 1%, the doped MgB 2 The transition temperature of the base superconductor is higher than that of the corresponding pure MgB 2 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 Patents(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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