Preparation method for europium iron arsenic super conductor wire and strip material

A superconductor and iron-arsenic technology, which is applied in the field of preparation of europium-iron-arsenic superconductor wire or strip, can solve problems such as hidden dangers, safety, complex process, etc., achieve high production efficiency, strengthen grain connectivity, and improve superconducting performance Effect

Inactive Publication Date: 2009-03-11
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the research on the new iron-based compound superconducting material wire strip mainly uses the iron-based arsenic oxide superconductor (ReFeAsO 1-x f X ), and about europium-iron-arsenic compound superconducting materials (EuFe 2 As 2 ) researches are mainly focused on the block material, and most of them adopt the step-by-step sintering method of quartz glass.

Method used

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Effect test

preparation example Construction

[0011] The concrete preparation process of the present invention is:

[0012] (1) will be according to the chemical formula Eu 1-x A x m 2 Pn 2 After the prepared raw material powder is mixed evenly, put it into the metal tube, fully tamp it, and then seal the two ends of the metal tube;

[0013] (2) swaging, drawing, and rolling the metal pipe according to the pass deformation of 5%-20% to obtain rods, wires or strips;

[0014] (3) Place the rod or wire strip processed through step 2 in a high-temperature heating furnace, and vacuumize to 10 at room temperature. -2 -10 -5 Pa, then filled with argon, and then kept at a temperature of 600-1000°C for 5-60 hours, and finally cooled to room temperature in a high-temperature furnace to obtain a new type of europium-iron-arsenic superconductor.

[0015] The above chemical formula Eu 1-x A x m 2 Pn 2 : A is an element selected from Li, Na, K, Rb, Cs; M is an element selected from Fe, Co, Ni; Pn is an element in As, P, Sb; x...

Embodiment 1

[0017] First according to the chemical formula Eu 0.5 Na 0.5 Fe 2 As 2 Weigh 1.08g of Eu powder, 1.60g of Fe powder, 2.15g of As powder and 0.16g of Na small pieces as indicated, and grind the powder in an argon atmosphere glove box to make it fully and uniformly mixed, and the mixed The powder is packed into a 10cm long iron tube with an inner diameter of 5mm and an outer diameter of 8mm, so that the powder is full and compact in the tube, and then the two ends are closed. Then, the iron pipe filled with the mixed powder was swaged to 4mm according to the pass deformation of 8%. Then place it in a high-temperature heating furnace and vacuumize it at room temperature until it reaches 10 -2 After the vacuum degree of Pa is filled with high-purity argon, then the temperature is raised to 850°C and kept for 40 hours, and finally cooled to room temperature with the annealing furnace, and Eu with a superconducting transition temperature of 35K is produced. 0.5 Na 0.5 Fe 2 As...

Embodiment 2

[0019] First, according to the chemical formula EuFe 2 As 2 Weigh 2.57g of Eu powder, 1.89g of Fe powder, and 2.54g of As powder as indicated, and grind the powder in an argon atmosphere glove box to make it fully and evenly mixed, and put the evenly mixed powder into an 8cm long copper In the tube, the inner diameter of the tube is 7mm, and the outer diameter is 9mm, so that the powder can be filled and compacted in the tube, and then both ends are closed. Then, the copper tube containing the mixed powder was swaged to 5 mm with a pass deformation of 5%. Then place it in a high-temperature heating furnace and vacuumize it at room temperature until it reaches 10 -3 After the vacuum degree of Pa is filled with high-purity argon, then the temperature is raised to 950 ° C for 30 hours, and finally cooled to room temperature with the annealing furnace to make EuFe 2 As 2 Superconducting rods.

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Abstract

The invention relates to a Eu-Fe-As superconductor and a wire and tape preparing method. The wire and tape preparing method comprises the following steps: (1) after raw material powder which is prepared according to a chemical formula: Eu1-xAxM2Pn2 is evenly mixed, the raw material powder is put into a metal pipe and is sufficiently tamped, then both ends of the metal pipe are sealed; (2) the metal pipe is rotatablely forged, drawn and rolled according to 5 to 20 percent of pass deformation to obtain a rod, a wire or a tape; (3) the rod, the wire or the tape which is processed by the step (2) is put into a high-temperature heating furnace and vacuumized to 10<-2>-10<-5> Pa at room temperature, then argon is inflated into the high-temperature heating furnace, and then the temperature of the high-temperature heating furnace is kept for 5 to 60 hours at the temperature of 600 to 1000 DEG C, and finally, the high-temperature heating furnace is cooled to the room temperature to obtain the Eu-Fe-As novel superconductor. Compared with the common stepping preparing method, the wire and tape preparing method is safe and reliable, a sintering process can be completed once, the technology is simple, the production efficiency is high, the density of the prepared Eu-Fe-As compound superconductor is higher, and the Eu-Fe-As superconductor has good superconduction performance.

Description

technical field [0001] The invention relates to a preparation method of europium-iron-arsenic superconductor wire or strip. Background technique [0002] Europium-iron-arsenic compound superconducting material (EuFe 2 As 2 ) is another newly discovered iron-based compound superconducting material. Through reasonable doping, its superconducting transition temperature can reach 35K, so it has attracted extensive attention from the international material community. Europium-iron-arsenic compound superconductor has ThCr 2 Si 2 type structure, with ReFeAsO 1-x f X Compared with superconductors, the structure of europium-iron-arsenic compound superconducting materials is simpler. Because it does not contain oxygen, the synthesis temperature is lowered and the synthesis time is shortened, so that the synthesis becomes easier and large single crystals can be obtained. These It is very beneficial to study the superconducting mechanism of iron-arsenic superconductors. Recently,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B12/00H01B13/00
CPCY02E40/64Y02E40/60
Inventor 齐彦鹏张现平王雷王栋樑高召顺马衍伟
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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