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Perovskite structure-based single-phase iron-based superconductive material and preparation method thereof

A technology of perovskite structure and superconducting materials, applied in the field of superconducting materials and their preparation, can solve the problems of no superconductivity, etc., achieve good superconducting stability and simple preparation process

Inactive Publication Date: 2011-03-30
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Subsequently, Sr was discovered 4 sc 2 o 6 Fe 2 As 2 , and Sr 4 Cr 2 o 6 Fe 2 As 2 , but most of these materials do not have superconductivity

Method used

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  • Perovskite structure-based single-phase iron-based superconductive material and preparation method thereof
  • Perovskite structure-based single-phase iron-based superconductive material and preparation method thereof
  • Perovskite structure-based single-phase iron-based superconductive material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0030] Synthesis of superconducting material Sr by solid-state reaction method 4 V 2 o 6 Fe 2 As 2 . The operation steps are as follows

[0031] 1) Step 1:

[0032] a. Preparation of SrAs precursor: adopt solid-state reaction method, this solid-state reaction method comprises quartz glass tube sealing method or high-melting point metal sealing method; As particles with 99.5% purity and Sr particles with 99%-99.99% purity are mixed with 1 : 1 molar ratio mixing and grinding, then the mixed and ground raw materials are pressed into small discs with a diameter of 10mm, wherein the tablet pressure is 2Mpa; sealed in a high vacuum (about 10 -5 Pa) in a quartz tube or a high-melting-point metal tube, first slowly raise the temperature to 500°C for 12 hours, then sinter at 680°C for 10 hours, and then slowly cool down to room temperature to obtain the SrAs compound;

[0033] b. Preparation of FeAs precursor: weigh As particles and Fe powder at a molar ratio of 1:1; grind and m...

Embodiment 2

[0039] Using V 2 o 5 Synthesis of Superconducting Material Sr by Solid State Reaction with Precursors 4 V 2 o 6 Fe 2 As 2 . The operation steps are as follows

[0040] 1) Step 1:

[0041] a. Preparation of SrAs precursor: adopt solid-state reaction method, this solid-state reaction method comprises quartz glass tube sealing method or high-melting point metal sealing method; As particles with 99.5% purity and Sr particles with 99%-99.99% purity are mixed with 1 : 1 molar ratio mixing and grinding, and then pressed into a small disc with a diameter of 10mm, wherein the tablet pressure is 3Mpa, 4Mpa or 6Mpa; sealed in a high vacuum (about 10 -5 Pa) in a quartz tube or a high melting point metal tube, first slowly raise the temperature to 500°C for 12 hours, then sinter at 680°C or 750°C for 7, 8, 9 or 10 hours, and then slowly cool down to room temperature , to obtain the SrAs compound;

[0042] Among them, the particle size of As particles and Sr particles is 100 mesh,...

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Abstract

The invention relates to a perovskite structure-based single-phase iron-based superconductive material and a preparation method thereof. The material has a two-dimensional laminar structure, and the composition is shown by the formula of Sr4V2O6Fe2As2. The preparation method of the material comprises the following steps of: preparing a SrAs precursor sample and an FeAs precursor sample; mixing the precursors, Sr0, V2O3, Fe and the like by using a solid-state chemical reaction method; and reacting at a high temperature to directly synthesize a perovskite layer-based iron-based superconductive material. Compared with other known iron-based superconductors, the material has higher bidimensionality. The material has electronic carrier characteristics, carrier concentration of 1,020 to 1,022 / cm<3> and superconductive transformation temperature of about 40K. An upper critical magnetic field of the material at a low temperature is estimated to be greater than 250 teslas, so that the material is probably applied to superconductive power transmission, strong magnetic field generation and the like. In addition, the material can also be used in a superconductive filter and the like. The preparation method is simple.

Description

technical field [0001] The present invention relates to a kind of superconducting material and preparation method thereof, particularly relate to a kind of Sr based on perovskite structure 4 V 2 o 6 Fe 2 As 2 Iron-based superconducting material and its preparation method. Background technique [0002] At present, similar materials, that is, layered oxyphosphorus compounds, can be uniformly expressed as quaternary compounds of LnOMPn (wherein Ln=La and Pr, etc.; M=Mn, Fe, Co and Ni; Pn=P and As). Some of them (LaOFeP, LaONiP) were found to exhibit superconductivity at low temperature (3-5K) in 2006. In early 2008, Kamihara et al. (Y.Kamihara, T.Watanabe, M.Hirano, and H.Hosono, J.Am.Chem.Soc.130, 3296 (2008)) reported on fluorine-doped LaFeAs[0 1-x f x ] found in the superconductivity with an initial transition temperature as high as 26K, which has aroused widespread concern in the superconducting community, and set off a new round of upsurge in the study of new superc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/547C04B35/01C04B35/622
Inventor 祝熙宇韩飞闻海虎单磊
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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