Synthesis of AlxGa1-xN Alloy by Solid-Phase Reaction under High Pressure

Bulk specimens of AlxGa1-xN alloys covering a composition range of 0≤x≤1 were synthesized by a solid-phase reaction under high pressure. In situ X-ray diffraction profiles were measured to observe the alloying process, which began at around 800°C under 6.0 GPa. SEM observation and X-ray analysis of the recovered specimen indicated a uniform distribution of Al and Ga and continuous variations of the lattice constants against the composition, which implies that a solid solution of AlN and GaN is formed regardless of atomic composition.