Phase relationships in the CeFe8Co3Ti1−ySiy system

The phase formation behavior of the nominal CeFe8Co3Ti1−ySiy 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 (Ms), Curie temperatures (TC), and magnetic anisotropy fields (Ha) are measured for the y≤0.4 samples and the values of Ms and Ha appear to be nearly identical for all y≤0.4. TC, however, is seen to increase about 20 °C in this range for increasing y. •CeFe8Co3Ti1-xSix is studied as x is increased from 0 to 0.55.•For increasing x the samples remain nearly single phase up to x = 0.4.•The saturation magnetization and anisotropy field stay nearly constant.•The Curie temperature increases for increasing x up to x = 0.4 by 20° C.•A phase with a large Curie temperature emerges alongside larger x samples.