Study of the Phase Diagram of the GaAs–GaSb Quasi-Binary System

Abstract

A study has been carried out on the quasi-binary phase diagram between GaAs and GaSb compounds, both of which crystallize in the zinc-blende structure.The liquidus and eutectic temperatures were determined by means of differential thermal analysis. Microscopic structures of several alloys were found to consist of primary crystals of the GaAs compound and an eutectic mixture of the GaAs and GaSb compounds. X-ray diffraction profiles indicated that an alloy containing 30 mol% GaAs consists of GaAs and GaSb phases, whose lattice parameters are slightly different from those of the stoichiometric compositions. Thermodynamic calculations were also carried out by using some data determined by the present experiment.These results lead to the conclusion that this quasi-binary system is an eutectic type, whose eutectic point occurs at 3.0mol%