Method for improving upper critical field and critical current density of iron-based superconductor

A critical current density and iron-based superconductor technology, which is applied in the usage of superconductor elements, the manufacture/processing of superconductor devices, superconducting devices, etc., can solve the problem of low critical current density of iron-based superconductors, and improve the irreversible field and Effects of critical current density, improvement of grain connectivity, and improvement of superconducting grain connectivity

Active Publication Date: 2012-04-11
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcoming of the low critical current density of the iron-based superconductor prepared by the prior art, and propose a method for improving the upper critical field and critical current density of the iron-based superconductor

Method used

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  • Method for improving upper critical field and critical current density of iron-based superconductor
  • Method for improving upper critical field and critical current density of iron-based superconductor
  • Method for improving upper critical field and critical current density of iron-based superconductor

Examples

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Embodiment 1

[0013] In an argon atmosphere glove box, put Ba chips, K blocks, Fe powder, and As powder according to the chemical formula Ba 0.5 K 0.5 Fe 2 As 2 For the molar ratio shown, weigh 1.963 grams of Ba, 0.559 grams of K, 3.193 grams of Fe, and 4.284 grams of As, and mix thoroughly and uniformly to obtain a precursor powder. Then add a mass ratio of Sn:Ba to the precursor powder 0.5 K 0.5 Fe 2 As 2 = 0.01:1 tin powder, after grinding and mixing evenly again, put the Sn-added precursor powder into the abrasive tool and press it into a block, put it into a quartz tube, vacuumize the quartz tube and seal it. Put the sealed quartz tube in an annealing furnace, keep it at 500°C for 0.5 hours, and then raise the temperature to 1100°C for 0.5 hours. After the furnace is cooled to room temperature, the magnetism and resistance of the sample are measured by a comprehensive physical property measurement system (PPMS-9, manufactured by Qunatum Design Company of the United States), and ...

Embodiment 2

[0015] In an argon atmosphere glove box, the solid-state reaction method sintered Ba 0.6 K 0.4 Fe 2 As 2 Weigh 5 grams, grind evenly, and then add a mass ratio of Sn: Ba 0.6 K 0.4 Fe 2 As 2 = 0.05:1 tin powder, grind and mix evenly again, put the mixed powder into a 10cm long iron tube, the inner diameter of the tube is 5mm, the outer diameter is 7mm, so that the powder is full and compact in the tube, and then the iron tube is sealed. tube ends. Place the sealed iron tube in the annealing furnace, fill it with high-purity argon after vacuuming, and raise the temperature to 1000°C for 5 hours. After the furnace is cooled to room temperature, the magnetism and resistance of the sample are measured by a comprehensive physical property measurement system (PPMS-9, manufactured by Qunatum Design Company of the United States), and the magnetization critical current density can be obtained greater than 15000A / cm 2 (4.2K, 0T), Ba with an irreversible field greater than 10T (30...

Embodiment 3

[0017] In an argon atmosphere glove box, put Ba chips, K blocks, and FeAs powder according to the chemical formula Ba 0.7 K 0.3 Fe 2 As 2 For the molar ratio shown, weigh 2.602 grams of Ba, 0.318 grams of K, and 7.080 grams of FeAs, and mix them thoroughly and uniformly to obtain the precursor powder. Then add a mass ratio of Sn:Ba to the precursor powder 0.7 K 0.3 Fe 2 As 2 = 0.1:1 tin powder, after re-grinding and mixing evenly, put the mixed powder into an 8cm long niobium tube with an inner diameter of 8mm and an outer diameter of 10mm, so that the powder is full and compact in the tube, and then closed Niobium tube ends. Put the sealed niobium tube in an annealing furnace, vacuumize it, keep it at 500°C for 10 hours, then raise the temperature to 900°C for 20 hours. After the furnace is cooled to room temperature, the magnetism and resistance of the sample are measured by a comprehensive physical property measurement system (PPMS-9, manufactured by Qunatum Design ...

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Abstract

The invention discloses a method for improving an upper critical field and critical current density of an iron-based superconductor. The method comprises the following steps of: adding tin, a tin-containing compound or tin-containing alloy into precursor powder or raw material powder of iron-based superconductor blocks or wires and tapes, uniformly mixing, briquetting the precursor powder, or adding the precursor powder into a metal pipe, a composite metal pipe or an alloy pipe, and drawing and rolling to form the wires and tapes; and roasting the blocks or the wires and tapes at the temperature of between 200 and 1,300 DEG C in the protective atmosphere or under a vacuum condition for 1 second to 100 hours. The prepared iron-based superconductor has excellent superconducting properties, such as a high critical current property, and a high upper critical field and a high irreversible field.

Description

technical field [0001] The invention relates to a method for improving the performance of an iron-based superconductor. Background technique [0002] At the beginning of January 2008, the H. Hosono research group of Tokyo Institute of Technology reported on the JASC magazine the LaO 1-x f x FeAs material research, and found that the material exhibits superconductivity at a temperature of 26K, this breakthrough has opened a new wave of research on high-temperature superconductivity in the scientific community [Kamihara Y.et al., Iron-based layered superconductor LaO 1-x f x FeAs(x=0.05-0.12) with T c =26K.J.Am.Chem.Sco.130, 3296-3297(2008)]. In the wave of discovery of new superconductors, a series of representative and high critical transition temperature iron-based superconductors were discovered. At present, according to the composition ratio and crystal structure of the parent compound, the new iron-based superconducting materials can be roughly divided into the follo...

Claims

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Application Information

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IPC IPC(8): H01B13/00H01B12/00
CPCH01B13/00H01L39/12H01L39/24Y02E40/64H01B12/00H10N60/855H10N60/01
Inventor 高召顺马衍伟王雷姚超齐彦鹏王春雷张现平王栋樑
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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