OXIDE SUPERCONDUCTING MATERIAL AND PRODUCTION THEREOF

摘要

PURPOSE:To obtain a high-quality Tl-contg. oxide superconducting material having a high critical temp. (Tc) by specifying the ratio between components in a superconducting Tl-Ba-Ca-Cu oxide and rendering a specified crystal structure. CONSTITUTION:This oxide superconducting material has a compsn. contg. at least Tl, Ba, Ca and Cu in (1.1-1.8):2:2:3 molar ratio and a crystal structure belonging to a tetragonal system having 0.385nm lattice constant (a) and 3.56nm lattice constant (c). When this Tl-contg. oxide superconducting material is produced, a body to be sintered is coated with a Tl-contg. material and the coated body is heat-treated. The amt. of Tl in the resulting sintered body is easily controlled and a high-quality Tl-contg. oxide superconducting material is obtd.