The recent great interest on (Gd1212) due to the coexistence of magnetic order and superconductivity in the same cell, has induced investigation on the whole RE1212 family where other Rare Earth elements (RE) are used. Being RE1212 isostructural to RE123 our interest focuses on Nd, that forms the highest RE123 compound and presents a slightly larger ionic radius than Gd and a lower magnetic moment. Pure Nd1212 is characterized by great structural disorder then, to investigate Gd1212 properties variation, only a partial substitution of Nd ions in Gd sites in the Gd1212 cell may be attempted. The possibility of Gd-Nd substitution and the solid solubility limit have been investigated by the synthesis of powders with a nominal composition. Phases formation has been checked by XRD. Experimental results indicate a limit for Nd solubility in Gd1212 of less than 20%. A corresponding limit of about 2% for Gd …