NEUTRON-DIFFRACTION STRUCTURAL STUDIES OF ND(2)FE(17-X)M(X)C(Y)

Four samples of Nd(2)Fe(17-x)M(x)C(y) (where M = Al, Ga, Ti, V) were s ynthesized using rf induction melting and C was introduced from the me lt. Structural studies were then carried out using neutron diffraction . All samples were confirmed to have the Th2Zn17-type rhombohedral str ucture with expanded unit cell volumes. However, the volume effect, as well as the site preference of the substitutional atoms (M) is differ ent among these samples and is different compared to their uncarbided counterparts. The C atoms were found to reside in the 9e site for all samples. The observed Curie temperature is higher for samples with hig her C concentrations.