[en] The effect of partial replacement of copper by zinc in Tl₂Ba₂Ca₂Cu₃O_10-δ superconductor phase is studied. Superconducting samples of the nominal composition Tl₂Ba₂Ca₂Cu_3-xZn_xO_10-δ with x ranging from 0 to 0.6 are prepared under normal pressure by a one step of solid-state reaction technique. The samples are characterized by using X-ray powder diffraction, scanning electron microscope (SEM) and EDX. The X-ray data indicate that the partial replacement of Cu²⁺ions by Zn²⁺ions does not influence the tetragonal structure of the samples, and the lattice parameters a and c vary according to the difference in the ionic radii of Cu and Zn. The superconducting parameters, such as superconducting transition temperature T_c, critical current density J_c and irreversibility field B_ir are calculated from electrical resistivity and AC-magnetic susceptibility measurements