A (Ho 0.17 Ba 0.33 Cu 0.5 ) 50 Ag 50 alloy ribbon with a non-equilibrium structure was produced by melt-spinning. Heating of the alloy ribbon in air brought about the structural change to a stable metallic phase at about 610 K, followed by the formation of Ho 1 Ba 2 Cu 3 O 6.7 and Ag in the range of 630 to 740 K. The mixed materials of Ho 1 Ba 2 Cu 3 O 6.7 and Ag produced by oxidization of the melt-spun ribbon exhibited high- T c superconductivity with onset at 90 K and zero resistance at 80 K. It is notable that the mixture of Ag enables us to produce an alloy ribbon by melt-spinning even in the Ho-Ba-Cu alloy system with large miscibility gap.
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