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Gadolinium thorium oxygen iron arsenic high-temperature superconducting material and preparation thereof

A superconducting material, iron arsenic technology, applied in the usage of superconducting elements, superconducting devices, superconducting/high conducting conductors, etc., can solve the problem of insufficient upper critical magnetic field, limited application range, low superconducting critical temperature, etc. problems, to achieve the effect of being beneficial to superconducting performance, broad application prospects, and good superconducting performance

Inactive Publication Date: 2008-10-01
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Traditional alloy superconducting materials (such as Nb 3 Although Sn) has high superconducting critical current and mechanical properties, their superconducting critical temperature is too low (T c Generally lower than 23K), the upper critical magnetic field is not large enough (generally less than 20T), which greatly limits its application range
Copper oxide high-temperature superconducting materials discovered in 1986 (such as YBa 2 Cu 3 o 7 ) Although the superconducting critical temperature T c Very high, the upper critical magnetic field B c2 It is also very large, but due to the weak pinning force of the magnetic flux, the superconducting critical current under the magnetic field is very low, and its practical application is also limited

Method used

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  • Gadolinium thorium oxygen iron arsenic high-temperature superconducting material and preparation thereof
  • Gadolinium thorium oxygen iron arsenic high-temperature superconducting material and preparation thereof
  • Gadolinium thorium oxygen iron arsenic high-temperature superconducting material and preparation thereof

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Effect test

Embodiment 1

[0021] 1) Combine GdAs, Gd 2 o 3 , ThO 2 , FeAs, and Fe powder and other raw materials are fully mixed according to the molar ratio of Gd, Th, O, Fe, As and other elements in a ratio of 0.8:0.2:1:1:1, uniformly mixed and ground in an argon atmosphere, and then heated in a 400MPa Stamping under pressure to obtain compressed tablets;

[0022] 2) Seal the above tablet in a vacuumed quartz tube, the vacuum degree is better than 0.1Pa, and then put it into a tube furnace for calcination for 36 hours at a calcination temperature of 1453K, and then quickly cool to room temperature to obtain Gd 0.8 Th 0.2 OFeAs bulk.

[0023] from figure 1 It can be seen that the main phase of the sample obtained by the above preparation method is Gd with a tetragonal structure (ZrCuSiAs type). 1-x Th x OFeAs compounds. Remove a small amount of residual ThO 2 In addition, all the X-ray diffraction peaks can be well indexed, and the unit cell parameters of the sample are from figure 2 with...

Embodiment 2

[0025] 1) Combine GdAs, Gd 2 o 3 , ThO 2 , FeAs, and Fe powder and other raw materials are fully mixed according to the molar ratio of Gd, Th, O, Fe, As and other elements in the ratio of 0.75:0.25:1:1:1, uniformly mixed and ground in an argon atmosphere, and then heated in a 400MPa Stamping under pressure to obtain compressed tablets;

[0026] 2) Seal the above tablet in a vacuumed quartz tube, the vacuum degree is better than 0.1Pa, and then put it into a tube furnace for calcination for 48 hours at a calcination temperature of 1473K, and then quickly cool to room temperature to obtain Gd 0.75 Th 0.25 OFeAs bulk.

[0027] from figure 1 It can be seen that the main phase of the sample obtained by the above method is a superconductor of gadolinium thorium iron arsenic, and the main impurity phase is ThO 2 , the unit cell parameters of the samples are shown in Table 1; from figure 2 It can be known that the resistivity of the synthesized gadolinium thorium iron arsenic ...

Embodiment 3-6

[0029] Table 1 is Gd 1-x Th x Raw material ratio, sintering temperature, superconducting critical temperature and unit cell parameters of OFeAs(0.05≤x≤0.30) single-phase samples. Table 1

[0030]

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Abstract

The invention relates to a high temperature superconducting material of gadolinium, thorium, oxygen, iron and arsenic, pertains to a ZrCuSiAs-type structure and has the same crystal structure as LaO1-yFyFeAs. The general formula of the high temperature superconducting material of gadolinium, thorium, oxygen, iron and arsenic of the invention is Gd1-xThx OFeAs, wherein, x is more than or equal to 0.05 and less than or equal to 0.30; the mole ratio of all elements content in the high temperature superconducting material gadolinium, thorium, oxygen, iron and arsenic is that Gd:Th: O: Fe: As is equal to 0.70 to 0.95: 0.3 to 0.05:1: 1: 1. According to the content of every element, the raw materials are mixed, ground, preformed, calcinated and quickly cooled, etc. so as to obtain a superconducting polycrystalline block. The high temperature superconducting material of gadolinium, thorium, oxygen, iron and arsenic of the invention has max superconducting critical temperature Tc which reaches 56.5 K, estimated upper critical field Bc2 exceeding 100 Tesla, is superior to the LaO1-yFyFeAs superconductor with similar structure and has obvious advantages in practical use.

Description

technical field [0001] The invention relates to a high-temperature superconducting material, in particular to a general formula of Gd 1-x Th x OFeAs gadolinium thorium iron arsenic high temperature superconducting material and preparation method thereof. Background technique [0002] When the temperature is lower than its superconducting critical temperature T c When the superconducting material has the characteristics of zero resistance, ideal diamagnetic effect (Meissner effect) and Josephson effect and other superconducting properties, it can realize lossless power transmission, and it can be made into a superconducting coil to generate a strong magnetic field. Magnetic levitation, manufacture of superconducting microwave electronic devices based on macroscopic quantum effects such as the Josephson effect, sensitive magnetic signal detection instrument - superconducting quantum interferometer (ie SQUID), and realizing superconducting quantum computing, etc. [0003] Tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/622H01B12/00
CPCY02E40/64Y02E40/60
Inventor 曹光旱许祝安王操李林军李玉科
Owner ZHEJIANG UNIV
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