[11a-Z01-1~11] 13.2 Exploratory Materials, Physical Properties, Devices

[11a-Z01-5] Mg₂Si at high pressures and high temperatures

〇Motoharu Imai¹, Soshi Ibuka¹, Yukihiro Isoda¹ (1.NIMS)

Keywords:Mg2Si, high pressure, structural phase transition

In this study, we investigated the phase behavior of Mg₂Si at high pressures ranging from 0 to 10 GPa and high temperatures ranging from 300 to 1500 K by in-situ observation using X-ray diffraction (XRD) measurement. No structural phase transition was observed when Mg₂Si was compressed up to 10 GPa at room temperature. In heating at the pressures above 3 GPa, Mg₂Si underwent a structural phase transition to a high-pressure and high-temperature (HPHT) phase. Thus, in this p-T region, one HPHT phase was observed.