Patent ID: 6103670
Filing Date: 2000-08-15
Classification: C04B,C30B,H01L,Y10S

Abstract:
An oxide superconductor manufacturing method of manufacturing a RE--Ba--Cu--O oxide superconductor (said RE is one or more of Dy, Gd, Eu, Sm and Nd) by performing a treatment, which includes at least a burning process performed in a range of temperatures that are higher than a melting point of a raw material mixture comprising an RE-compound, a Ba-compound and a Cu-compound, on said raw material mixture, and said oxide superconductor manufacturing method comprising:an addition step of adding from 1 wt % to 30 wt % of metal Ag or a Ag-compound to said raw material mixture (in case of adding said Ag-compound, the additional amount is indicated by the element weight of only said metal Ag); anda crystallization step of melting said raw material mixture, to which said metal Ag or said Ag-compound is added, at a temperature that is not lower than a temperature at which said raw material mixture is decomposed and fused into a RE.sub.2 BaCuO.sub.5 phase and a liquid phase, and then lowering the temperature of said raw material mixture to a temperature close to a temperature at which a RE.sub.1 Ba.sub.2 Cu.sub.3 O.sub.7-X phase crystallizes, and subsequently bringing a seed crystal which meets the condition:(a crystallized temperature of a RE.sub.1 Ba.sub.2 Cu.sub.3 O.sub.7-X phase of the seed crystal)>(a crystallized temperature of the RE.sub.1 Ba.sub.2 Cu.sub.3 O.sub.7-X phase of said raw material mixture to which said metal Ag or said Ag-compound is added), into contact with said raw material mixture, and then performing crystallization by using the seed crystal as a starting point of crystallization.