Typical x-ray diffraction patterns of powders recorded under pressure. The meaning of “de” is decompression. The diameter of the hole in the gasket is decreased with pressure; therefore, the existence of iron can be detected. There exists a transformation from bcc iron to hcp iron at 13 GPa, which is well documented in literature (Ref. 26).
Lattice parameters of as a function of pressure.
Variations of relative lattice parameters vs hydrostatic pressure.
Unit cell volume of as a function of pressure.
Charge density on the plane of for pressures of (a) zero and (b) 36 GPa.
Normalized bond lengths in unit cell as a function of pressure.
Summary of lattice parameters, unit cell volume, and their relative changes with pressures.
Ab initio calculations of lattice parameters, unit cell volume, and the bond lengths of , , and with pressures.
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