Abstract
Processing, structure and some physical properties of directionally solidified high temperature ceramic superconductor of YBa₂Cu₃O_7-x + 20 wt.% Y₂BaCuO₅ type are reported. The structure of directionally solidified superconductors consisted of several grains with a - b planes oriented along the axis of the samples. The microstructure of the grains consisted of YBa₂Cu₃O_7-x parallel plates and Y₂BaCuO₅ particles with a mean diameter of 2.1 × 10^-6 m. After heat treatments in a dynamic oxygen atmosphere the critical temperature was measured to be T_c = 91 ± K. From magnetic measurements, critical current density J_c at 77 K in a direction parallel to a - b planes was determined to be 5 × 10⁴ A cm^-2 in zero magnetic field. In magnetic fields parallel to c axis (B || c), the J_c values significantly decreased to 11.9 x 10³ and 1 × 10³ A cm^-2 at B = 0.15 and 4 T, respectively. In magnetic fields perpendicular to c axis (B || c), the J_c values of 3 × 10³ and 1.3 × 10³ A cm^-2 were measured at 0.15 and 4 T, respectively.

Key words
processing, structure, physical properties, YBa₂Cu₃O_7-x superconductor

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