MAGNETIC AND FE-57 MOSSBAUER STUDIES OF INTERMETALLIC COMPOUNDS R2 (FE1-X-YNIXCOY)17 (R=Y,GD,TB, X=0,0.10,0.20, Y=0,0.05, 0.10)

Mossbauer studies of R2(Fe1-x-yNixCoy)17 showed that the transferred hyperfine field at Fe nuclei due to magnetic rare earth (R) atoms is about one Tesla. Magnetic moments of the R atoms were determined from magnetic measurements as mu-Tb = 8.52-mu-B, mu-Gd = 6.22. The mixed substitution of Ni and Co for Fe leads to an increase of the ordering temperature. A slight preference occupancy for Fe was observed involving the dumbbell shaped f or c site. The substitution effects of Ni and Co on the hyperfine field of f or c site, the average hyperfine field and the average isomer shift were also discussed.Physics, Atomic, Molecular & ChemicalPhysics, Condensed MatterPhysics, NuclearSCI(E)