摘要
Energy-dispersive x-ray diffraction experiments were carried out to investigate the structure of phase transitions under high pressure. It was found that the zinc blende (B3) to rock salt (B 1 ) phase transition pressures of Zn 0.93 Mn 0.07 Se and Zn 0.76 Mn 0.24 Se bulk crystals are found 11.8 ± 1.5 and 9.9 ± 0.5 GPa, respectively. The respective bulk moduli are 61.8 ± 0.8 and 60.5 ± 0.8 GPa. The pressure-induced zinc blende (ZB) to rock salt (RS) structure phase transition is interpreted as a signature of the semiconductor to metal transition for Zn 1-x Mn x Se. The above interpretation is further corroborated by the observation of the disappearance of the longitudinal optical phonon at the pressure where the ZB to RS structure transition occurs. © 1999 American Institute of Physics.