METHOD FOR IMPROVING UPPER CRITICAL FIELD AND CRITICAL CURRENT DENSITY OF IRON-BASED SUPERCONDUCTOR

摘要

A method for improving an upper critical field and a critical current density of an iron-based superconductor is characterized by adding tin, a tin-containing compound or a tin-containing alloy into precursor powder or raw material powder of an iron-based superconductor bulk or strip, mixing the mixture evenly, then pressing the precursor powder into a bulk or filling the precursor powder into a metal pipe, composite metal pipe or alloy pipe and performing drawing and rolling to form a wire or strip, and then roasting the bulk, the wire or the strip at the temperature of between 200°C and 1300°C for 1 second to 100 hours under a protective atmosphere or vacuum condition. The iron-based superconductor prepared in the present invention has excellent superconducting characteristics, comprising a high critical current characteristic, a high upper critical field and an irreversible field.