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Method for preparing iron-based superconductor

An iron-based superconductor and iron-based technology are applied in the field of strong magnetic field preparation of iron-based superconductors, which can solve the problems of low material density, weak connection, and poor superconductivity.

Inactive Publication Date: 2010-08-25
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

Chinese patent 200810106039.6 "An iron-based compound superconducting wire, strip and its preparation method" discloses a synthesis method of an iron-based superconducting material. This method adopts a conventional synthesis process without introducing a magnetic field in the synthesis process. Moreover, the iron-based superconductor grains prepared by this method are disorderly arranged, the material density is low, and there is a serious weak connection problem, resulting in low critical current density and poor superconductivity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Preparation of iron-based superconductor bulk. Preparation of Ba by chemical solid-phase reaction 0.5 K 0.5 Fe 2 As 2 Iron-based superconductor powder 5g, put the powder into a grinding 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 into a magnetic field heat treatment furnace with an Ar atmosphere; turn on the power of the strong magnetic field and the heat treatment furnace, after the sample is kept at a magnetic field strength of 1 Tesla and a temperature of 850 ° C for 20 hours, turn off the magnetic field and the power of the heat treatment furnace , the sample is cooled to room temperature with the heat treatment furnace, and then the iron-based superconducting bulk material of the present invention is made. The magnetization critical current of the sample was measured by a comprehensive physical property measurement system (PPMS-9, manufactured by Qunatum Design, USA). The magnetiza...

Embodiment 2

[0022] In an argon atmosphere glove box, the Ba obtained by solid-state reaction sintering 0.6 K 0.4 Fe 2 As 2 Weigh 10 grams, grind evenly, and then add the mass ratio of Ag:Ba 0.6 K 0.4 Fe 2 As 2 = 0.05:1 silver powder, grind and mix uniformly again, put the uniformly mixed powder into a 10cm long iron pipe, the inner diameter of the pipe is 5mm, and the outer diameter of the pipe is 7mm, so that the powder is full and tight in the pipe, and then the iron pipe is closed. both ends. Put the sealed iron tube into a magnetic field heat treatment furnace with an Ar atmosphere; turn on the power of the strong magnetic field and the heat treatment furnace, and after the sample is kept at a magnetic field strength of 0.1 Tesla and a temperature of 900 ° C for 15 hours, turn off the magnetic field and the power of the heat treatment furnace. , and the sample is cooled to room temperature with the heat treatment furnace to make the iron-based superconductor of the present inve...

Embodiment 3

[0024] In an argon atmosphere glove box, the Ba shavings, K blocks, and FeAs powders were mixed according to the chemical formula Ba 0.7 K 0.3 Fe 2 As 2 In the molar ratio shown, weigh Ba 2.602 g, K 0.318 g, FeAs 7.080 g, mix thoroughly and evenly, and put the mixed powder into a 8cm-long niobium tube with an inner diameter of 8 mm and an outer diameter of 10 mm, so that the powder is The tube is filled and tight, and then the ends of the niobium tube are closed. Place the sealed niobium tube in a magnetic field heat treatment furnace with an Ar atmosphere; turn on the power of the strong magnetic field and the heat treatment furnace. After the sample is kept at a magnetic field strength of 14 Tesla and a temperature of 500 ° C for 30 hours, the magnetic field and the power of the heat treatment furnace are turned off. , and the sample is cooled to room temperature with the heat treatment furnace to make the iron-based superconductor of the present invention. The supercond...

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Abstract

The invention relates to a method for preparing an iron-based superconductor. The method comprises the following steps: correspondingly processing iron-based superconductor precursor powder to obtain a lumpish or strip sample; putting the lumpish or strip sample into an Ar atmosphere protected or vacuum intense magnetic field heat treatment furnace; preserving the heat under a magnetic field intensity of between 0.1 and 30 Tesla and at the temperature of between 500 and 1,500 DEG C for 0.1 to 100 hours; and cooling the sample to room temperature together with the heat treatment furnace to obtain an iron-based superconductor sample; or the method comprises the following steps: dispersing sintered iron-based superconductor powder in a solvent; ultrasonically mixing the powder and the solvent; keeping the mixture in a magnetic field with a magnetic field intensity of between 0.1 and 30 Tesla for 0.1 to 2 hours; evaporating the solvent; putting the iron-based superconductor powder which is treated in the magnetic field into an Ar atmosphere or vacuum heat treatment furnace; and preserving the heat at the temperature of between 500 and 1,500 DEG C for 0.1 to 100 hours to obtain the iron-based superconductor sample. The method can effectively improve the connectivity of crystalline grains, greatly enhances the critical current density, upper critical field and irreversible field of the iron-based superconductor and makes the practicability of the iron-based superconductor become possible.

Description

technical field [0001] The invention relates to a preparation method of an iron-based superconductor, in particular to a preparation method of a strong magnetic field of the iron-based superconductor. Background technique [0002] In early January 2008, H. Hosono's research group from Tokyo Institute of Technology, Japan reported on LaO in JASC magazine. 1-x F x Research on FeAs materials, and found that the material exhibits superconductivity at a temperature of 26 K. This breakthrough has opened a new round of high-temperature superconductivity research in the scientific community [Kamihara Y. et al., Iron-based layered superconductorLaO 1-x F x FeAs(x=0.05-0.12)with T c =26 K.J.Am.Chem.Sco.130, 3296-3297 (2008)]. 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 following four systems: (1) " 1111" system, members include LnOFePn (Ln=La, Ce, Pr, Nd, S...

Claims

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Application Information

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IPC IPC(8): H01B13/00H01B12/00
CPCY02E40/64Y02E40/60
Inventor 高召顺马衍伟王栋樑张现平王雷齐彦鹏姚超
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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