Gadolinium thorium oxygen iron arsenic high-temperature superconducting material and preparation thereof

Abstract

The invention relates to a high temperature superconducting material of gadolinium, thorium, oxygen, iron and arsenic, pertains to a ZrCuSiAs-type structure and has the same crystal structure as LaO1-yFyFeAs. The general formula of the high temperature superconducting material of gadolinium, thorium, oxygen, iron and arsenic of the invention is Gd1-xThx OFeAs, wherein, x is more than or equal to 0.05 and less than or equal to 0.30; the mole ratio of all elements content in the high temperature superconducting material gadolinium, thorium, oxygen, iron and arsenic is that Gd:Th: O: Fe: As is equal to 0.70 to 0.95: 0.3 to 0.05:1: 1: 1. According to the content of every element, the raw materials are mixed, ground, preformed, calcinated and quickly cooled, etc. so as to obtain a superconducting polycrystalline block. The high temperature superconducting material of gadolinium, thorium, oxygen, iron and arsenic of the invention has max superconducting critical temperature Tc which reaches56.5 K, estimated upper critical field Bc2 exceeding 100 Tesla, is superior to the LaO1-yFyFeAs superconductor with similar structure and has obvious advantages in practical use.

Description

Gadolinium thorium iron arsenic high temperature superconducting material and preparation method thereof technical field The invention relates to a high-temperature superconducting material, in particular to a gadolinium thorium oxyiron arsenic high-temperature superconducting material with a general formula of Gd1-xThxOFeAs and a preparation method thereof. Background technique When the temperature is lower than its superconducting critical temperature Tc, the superconducting material has the characteristics of zero resistance, ideal diamagnetic effect (ie Meissner effect) and superconducting state characteristics such as Josephson effect, so it can realize lossless power transmission. Make superconducting coils to generate strong magnetic fields, superconducting magnetic levitation, manufacture superconducting microwave electronic devices based on macroscopic quantum effects such as the Josephson effect, sensitive magnetic signal detection instruments-superconducting quan...

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Problems solved by technology

Although traditional alloy superconducting materials (such as Nb3Sn) have high superconducting critical current and mechanical properties, their superconducting critical temperature is too low (Tc is generally lower than 23K), and the upper critical magnetic field is not large enough (generally less than 20T ), which greatly limits its scope of application

Although the copper oxide high-temperature superconducting material (such as YBa2Cu3O7) discovered in 1986 has a high superconducting critical temperature Tc and a large upper critical magnetic field Bc2, due to the weak pinning force of the magnetic flux, the superconducting critical current under the magnetic field Very low, its practical application is also subject to greater restrictions

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