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Superconducting films of Ag-doped Tl–Ba–Ca–Cu–O with a varying molar ratio of Ag dopant ranging from 0 to 0.5 were prepared by spray pyrolysis of Ba–Ca–Cu–Ag–O precursor films on MgO substrate, and then post annealed with Tl-bulk sources. Phase transformation of the multiple phases of Tl-2212 and Tl-1223 to a single-phase of Tl-2223 was observed in the Ag-doped Tl–Ba–Ca–Cu–O superconducting films...