Phase relationships in the CeFe₈Co₃Ti_1−ySi_y system

The phase formation behavior of the nominal CeFe₈Co₃Ti_1−ySi_y system is investigated for 0≤y≤0.6 by powder x-ray diffraction and scanning electron microscopy with energy dispersive x-ray spectroscopy for ingots formed by arc-melting then annealing at 1000 °C and quenching to room temperature. The ingots are seen to nearly single phase for y≤0.4 and are multi-phase for y≥0.5 though a compound of the ThMn₁₂ type does indeed form for all values of y. The saturation magnetizations (M_s), Curie temperatures (T_C), and magnetic anisotropy fields (H_a) are measured for the y≤0.4 samples and the values of M_s andH_a appear to be nearly identical for all y≤0.4. T_C, however, is seen to increase about 20 °C in this range for increasing y.