Precursor filaments of Dy-Ba-Cu-O super-conductor were prepared by a solution spinning method and partially melting in an atmosphere gas with various oxygen concentrations. It was found that the transport Jc value at 77 K and 0 T of the filamentary sample was strongly dependent on the partial-melting temperature and gas atmosphere. The samples partially melted under flowing 1%O2 + Ar gas exhibited Jc values larger than 104 A/cm2 over a wide temperature range of 980-1040° C and a dense microstructure. The filamentary sample with the starting composition of Dy : Ba : Cu = 1.18 : 2.12 : 3.09 treated at 1020°C under flowing 1%O2 + Ar showed a transport Jc value greater than 4.3 × 104 A/cm 2 at 77 K and 0 T, and the Jc value of 2.0 × 103 A/cm2 was maintained up to the magnetic fields of 14 T. The samples partially melted in 20% O2 + Ar gas and 100%O2 gas showed relatively low Jc value of 6.0 × 103 A/cm2 and 1.2 × 102 A/cm2 at most.
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