[en] Saturation magnetization, magnetization vs temperature, Curie temperatures, and lattice parameters are presented for the ternary alloys Gd/sub 1-x/Th/sub x/Fe₂ and Gd/sub 1-x/Ce/sub x/Fe₂. Quadrivalent Th and Ce were introduced into the lattice in an effort to induce ferromagnetic Gd--Fe coupling. Experiment showed that the antiferromagnetic Gd--Fe coupling in GdFe₂ is preserved in the ternaries. The Fe moment and Curie temperature decrease as the Gd content of the sample is decreased. This is ascribed to electron transfer from Th or Ce to the Fe d shell. Failure to achieve ferromagnetic coupling is ascribed to electron capture by iron, which prevents a rise in electron concentration as Gd is replaced by Ce or Th. (U.S.)