PURPOSE: To obtain the product of high purity and high critical current density with by-products reduced by using BaCuO2 powder, Ca2CuO3 powder and a Tl compound as starting substances in the production of a Tl-Ba-Ca-Cu-O superconductor.
CONSTITUTION: A powder of BaCuO2 and another powder of Ca2CuO3 are mixed, calcined and crushed, then the mixture is combined with a Tl compound (such as Tl2O3), or BaCuO2 powder and Ca2CuO3 powder are mixed, the resultant mixture is mixed with a Tl compound, and the mixture is calcined to an oxide superconductor of the Tl-Ba-Ca-Cu-O system. The proportions of individual components are adjusted so that an oxide superconductor of the composition represented by a general formula TlaBabCacCumOn (1≤a, b, c, m≤3, 4≤n≤15) is obtained. The superconductor is suitably used in the magnetic levitation propulsion system for trains.
ITO TAKAO
SAKATA HIROYUKI
Next Patent: SUPERCONDUCTOR