Dense Y1Ba2Cu3 oxides with a highly oriented structure were prepared by press forging at temperatures above 1248 K in air. The c plane of the oxides is preferentially oriented perpendicular to the pressing direction, and the orientation factor (F) and density attained by press forging at 1273 K are 0.58 and 6.19 Mg/m3, respectively. Subsequent annealing treatment for 36 h at 1173 K and for 200 h at 773 K in O2 for the press forged oxides causes a high-T
c superconductivity with T
c of 90 K and J
c of 800 A/cm2 at 77 K in zero field. The J
c value seems to be attributed to the highly oriented and densified structure.
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