Structural phase transitions and equations of state for selenium under pressure

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Abstract
Pressure-induced structural phase transitions in hexagonal Se were studied for the first time by high-pressure energy dispersive x-ray-diffraction techniques up to 50 GPa. The observed phase transitions are as follows: from hexagonal to monoclinic at 14(1) GPa, from monoclinic to tetragonal at 28(2) GPa, and from tetragonal to rhombohedral at 41(3) GPa. All the observed phase transitions are reversible with hysteresis. The high-pressure behavior of selenium is compared with that of tellurium. The room-temperature equation-of-state data for all the phases are presented.