Patent ID: 8409657

Claim:
A process for producing thick-film tape-shaped RE-type (123) superconductor comprising: coating of a raw material solution comprising an organic acid salt, including fluorine, of a metal element which composes the RE-type (123) superconductor and an organic solvent onto a biaxially-oriented substrate to produce a coated substrate; subjecting the coated substrate to a calcination heat-treatment at a first temperature higher than a volatilization temperature of the organic solvent and a decomposition temperature of the organic acid salt in solution; subsequent to said calcination heat-treatment, subjecting the coated substrate to a heat-treatment at a second temperature in a mixed gas atmosphere having a water vapor partial pressure of less than 13.5% for producing the RE-type (123) superconductor; subjecting the coated substrate to an intermediate heat-treatment to remove the residual organic acid salt and/or the residual fluoride by calcinations before reaching the crystallization temperature of the superconductor, at a third temperature at a constant temperature for a predetermined time higher than the first temperature and lower than the second temperature, between said calcination heat-treatment and said heat-treatment for producing the superconductor, wherein the intermediate heat-treatment is given in the mixed gas atmosphere having an oxygen partial pressure of less than 1% which does not react to the RE-type (123) superconductor, and the third temperature is less than the decomposition temperature of BaF 2 ; and producing the thick-film tape-shaped RE-type superconductor having a film thickness of greater than 2.0 μm.