抄録
We performed high pressure and high temperature experiments at the pressure range between 30 and 100 GPa, at 1500 – 2000 K. Although it was not easy to identify diffraction peaks observed at high pressure and high temperature, diffraction patterns observed for recovered samples show the existence of crystalline Fe7C3. It is also noted that FeO is observed with Fe7C3 in most of the experiments. We used NaCl or Al2O3 disks as thermal insulator with the sample. FeO could be observed in the both experiments. We could not detect melt in the diffraction patterns obtained at high pressure and high temperature. Results in this study suggest that Fe3C is not stable at high pressure and high temperature and transforms into Fe7C3 + Fe, although it is still discussing why Fe is oxidized to FeO in DACs.
