Synthesis of γ-Ga2O3–Al2O3 solid solutions by spray pyrolysis method

Synthesis of the γ-Ga2O3–Al2O3 solid solutions by spray pyrolysis was examined. Spherical particles were obtained using an aqueous solution of Al(NO3)3 and Ga(NO3)3 with HNO3. For Ga-rich composition, γ-phase solid solutions were directly crystallized by the spray pyrolysis. For Al-rich composition, spray pyrolysis gave amorphous products unless a sufficient thermal energy was supplied during the spray pyrolysis. Subsequent calcination of the amorphous products gave γ-Ga2O3–Al2O3 solid solutions. However, physical properties of the solid solutions were affected by the spray pyrolysis conditions.