GETE-PHASES UNDER SHEAR DEFORMATION AND HIGH-PRESSURE UP TO 56-GPA

An ''in situ'' X-ray diffraction study of the GeTe under shear deforma tion and nonhydrostatic pressure conditions has been performed. By app lying the shear deformation, two phase transitions with structure chan ges from NaCl to GeS and further to CsCl types were first detected at 19.2 and 38 GPa respectively. The X-ray powder diffraction data and un it-cell parameters of both pressure-induced phases of GeTe are given. The shear-deformation dependence of the GeTe transition pressures is f ound.