  Change in structure and magnetic properties of SmCo5-xFex permanent magnets
for different values of x ranging from 0 to 2 have been studied. Structural
investigation from X-ray diffraction (XRD) patterns confirms the hexagonal
CaCu5-type structure of the SmCo5-xFex ribbons for 0<x<2. The decrease in
angular position of the diffraction peaks points to the lattice expansion due
to the substitution of Co atoms by larger Fe atoms. Mixture of phases occurs
for x>2 and has been confirmed by both XRD studies and magnetic measurements.
Nucleation effect induced by the additive Fe enhances the coercivity (Hc)up to
27 kOe which is much larger than 4.5 kOe obtained for pure SmCo5.
