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The physical properties of the ceramic YBa(sub 2)Cu(sub (3-x))Co(sub x)O(sub y) have been investigated in order to evaluate its usefulness as a substrate material for YBCO superconductors. YBa(sub 2)Cu(sub (3-x))Co(sub x)O(sub y) has been found to be thermally and chemically compatible with 123 and displays adequate electrical properties for a substrate material. A material with the nominal composition of YBa(sub 2)Cu(sub 2.2)Co(sub 0.8)O(sub 7) was investigated, extensively. The mechanical properties of this material were found to be poor, e.g., tensile strength was only 60 MPa. A semiconductor-like behavior was observed with a room-temperature resistivity of 70 m(Omega).cm and a resistivity equal to 4 (times) 10(sup 6) m(Omega).cm at 77 K.