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The effect of the partial substitution of Cu for Al on the structural, compositional, and magnetic properties of polycrystalline compounds YBa2Cu3O7−δ was studied. All prepared samples turned out to be single-phase with a small fraction of Ba secondary phases. Substitution of more than 2% aluminum causes an increase in spurious phases. DC susceptibility measurements show that the superconducting transition temperature TC decreases. Hysteresis loops show that magnetic irreversibility decreasesdoi:10.1088/1742-6596/1399/2/022031 fatcat:vsnrktgw3zc7zeyazpxtpam5xq