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Bi 2 Sr 2 Ca 2 Cu 3 O x (Bi-2223) were prepared using a solid state reaction method at different sintering times and temperatures. Structural phase identifications have been done using X-Ray analysis and refinement by Reitveld method which proves the coexistence of Bi-2223 and Bi-2212 phases. The critical transition temperature T c and critical current density J c values were measured using superconducting quantum interference device magnetometer (SQUID) and by the magneto-optics technique. A remarkable rapid decrease to the diamagnetic signal in the magnetization versus temperature M(T) at 110 K and J c around 1.2 Â 10 7 A/m 2 at 5 K are confirmed for the Bi-2223 compound.

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