Pressure-induced amorphization of GeSe%c

The high-pressure room temperature behavior of crystalline GeSe2 is i nvestigated with Raman scattering and energy-dispersive X-ray diffrac tion in a diamond anvil cell. No evidence for phase transitions to kn own polymorphs of GeSe2 is observed during compression up to 11 GPa. Pressure-induced amorphization, associated with the sample becoming o paque, occurs between 11 and 14 GPa. the sample recovered to ambient conditions from 14 GPa is amorphous by X-ray diffraction. The Raman s pectrum of the sample decompressed from the Raman spectra of glassy G eSe2 prepared by melt quenching at atmospheric pressure. these result s are discussed in relation to the possible transition from the 2:4 o t 3:6 coordination during compression of AB2 compounds with structure s related to the random tetrahedral network model of amorphous GeSe2.