The effect of composition on the Curie temperature of κ-phase (Fe, Mn)3AlCx

The effect of composition on the Curie temperature of κ-phase (Fe, Mn)3AlCx was investigated by thermomagnetometry analysis (TMA). Results reveal that increasing carbon content decreases the Curie temperature, while manganese has little effect. Serrations in the magnetization versus temperature curve of Fe3AlCx found at about 100 °C, may arise from the fluctuation of carbon atoms between Site I and II of κ-phase unit cell.