High pressure X-ray and Raman study of ZnSe

Abstract

ZnSe has been studied in a diamond anvil cell by energy dispersive X-ray diffraction with a synchrotron source to 120 GPa and by Raman spectroscopy to 11 GPa. An apparent anomaly in the equation of state, and discontinuity of the TO and LO Raman frequencies vs pressure was observed in the zinc blende phase at 5 GPa. A small structural distortion was observed in the rock salt phase between 12 and 47 GPa. The rock salt phase transformed to a simple hexagonal type structure at 55 ± 8 GPa.