Mössbauer and magnetic properties study of Nd2Fe14C-type compounds

The dependence of the Curie temperature T_c and saturation magnetization σ_s on composition was studied in the alloys Nd₁₄Fe_{78 − x}T_xC₈ (T ≡ Co, Ni, Mn, Cr). The effects on T_c and σ_s of the substitution of these 3d elements for iron were found to be similar to the effects on T_c and σ_s of the corresponding borides. Mössbauer spectra of the tetragonal Nd₂Fe₁₄C compound were taken at various temperatures and fitted with a set of six subspectra owing to six non-equivalent iron sites. It was found that the average hyperfine fields at 295 K and 4.2 K are 28.04 T and 32.36 T, the corresponding average iron moments being about 1.89 μ_B and 2.19 μ_B, respectively.