Iron-based oxide superconducting material and preparation method thereof

Abstract

The invention discloses an iron-based oxide superconducting material and a preparation method thereof. The iron-based oxide superconducting material Nb2Ge1Se1Ni3Fe3F2O14 is composed of iron as a basematerial and mixtures composed of niobium, germanium, selenium, nickel, iron, fluorine and oxygen according to a molecular weight group. The mixtures are respectively Nb2O5, GeO2, SeO3, Ni3O2, Fe3O4 compounds and F2 gas, and the proportion combination sequence of the Nb2O5, GeO2, SeO3, Ni3O2 and Fe3O4 compounds is 0.2 : 0.6 : 2 : 2 : 5.2. The critical superconducting temperature of the niobium-germanium (Nb3Ge) alloy reaches 25K, the niobium-germanium (Nb3Ge) alloy doped with iron, nickel and selenium oxides is sintered and ground at high temperature and high pressure, fluorine (F2) is introduced for sintering and grinding at high temperature and high pressure, the superconducting critical temperature (Tc) of the obtained powder material is 57K, and the current iron-based superconductor critical temperature 50K is broken through.

Description

technical field [0001] The invention relates to the technical field of superconducting materials, in particular to an iron-based oxide superconducting material and a preparation method thereof. Background technique [0002] Following copper-based superconducting materials, Japanese and Chinese scientists have recently reported the discovery of a new class of high-temperature superconducting materials—iron-based superconducting materials. The US "Science" magazine website reported that the physics community believes that this is a "significant progress" in the field of high-temperature superconductivity research. [0003] In the past few years, the research team of the Institute of Physics of the Chinese Academy of Sciences and the University of Science and Technology of China, represented by Zhao Zhongxian, Chen Xianhui, Wang Nanlin, Wen Haihu, and Fang Zhong, because of the discovery of iron-based high-temperature superconductors above 40K and the research on some basic phy...

AI Technical Summary

Problems solved by technology

[0005] However, until today, the physics community has not yet reached a consensus on the high-temperature superconducting mechanism of copper-based superconducting materials, which also makes high-temperature superconductivity one of the biggest mysteries in condensed matter physics today.