A HIGH TEMPERATURE SUPERCONDUCTIVE MATERIAL AND THE PREPARATION METHOD THEREOF

摘要

A high temperature superconductive material with a formula of SmO1-xFxFeAs (wherein 0=x=0.4). Its Tc is 0-53K. Its preparation method comprises the following steps: Mix the high-purity Sm and As uniformly in an atmosphere with no oxygen and low moisture and then press them into chips; Anneal the chips at 500-650? for 3-10h in high vacuum and further anneal the chips at 800-950? for 5-10h and then cool them down to obtain the pre-product SmAs; Mix SmAs, high-purity SmF3, Fe, Fe2O3 and As uniformly according to the specific ratio in an atmosphere with no oxygen and low moisture and then press them into pellets; Wrap the pellets into Ta foil and anneal them at 1000-1200? for 40-60h in high vacuum; Cool them down to room temperature and peel the Ta foil off to obtain the final product.