Abstract
The high-pressure phase transition of Mg2Si was investigated using angel dispersive synchrotron radiation X-ray diffraction with diamond anvil cell. A phase transition of Mg2Si occurs from the anti-fluorite structure to a monoclinic structure instead of the anti-cotunnite structure at about 11.1GPa, which is reversible. Isothermal pressure-volume relationship of anti-fluorite Mg2Si is well described by the third-order Birch–Murnaghan equation of state with V0=64.0(2)Å3 and B0=58(2)GPa.
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