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In this work we have studied the pore structure and electrical transport properties of superconducting YBa2Cu3O7−y polycrystalline samples doped by the addition of different Sb2O3 concentrations, i.e. resulting in (YBa2Cu3O7−y)1−x(Sb2O3)x. The samples were prepared through the solid-state reaction method. Rietveld analyses of X-ray diffraction data were used to investigate how the lattice parameters...