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In this study,the effects of manganese (Mn) on bulk Gd-123 superconductor is investigated.A good dopant must improve the characteristics of the sample but slightly affect its transition temperature.Gd-123 is a superconductor that exhibits superconductivity at Tc=92 K.Mn is added in the bulk Gd-123 sample via weight percentage.Addition is done to improve the superconducting characteristics of the bulk sample.