Phase Transitions in Silicon-Germanium Alloys under Pressure

Abstract

Structural phase transitions in Si1-xGex alloys are studied by energy dispersive X-ray diffraction at room temperature and pressures up to 42 GPa. The comparison with the behaviour of the pure elements shows a very strong nonlinearity in the β-Sn to p.h. phase transition pressure with respect to the alloys concentration x. No new phase is observed in the alloys.