【Others Papers】Novel Short-Process Synthesis of β-Ga₂O₃ Powder via a Subcritical Heterogeneous Reaction Coupled with Calcination Transformation

      Researchers from  Jiangxi University of Science and Technology have published a dissertation titled " Novel Short-Process Synthesis of βGa₂O₃ Powder via a Subcritical Heterogeneous Reaction Coupled with Calcination Transformation " in Materials Today Communications.

Abstract

      β-phase gallium oxide (β-Ga₂O₃) is an important wide-bandgap semiconductor material, and in its powder form, it serves as a critical raw material for semiconductor and optoelectronic applications. In this study, a novel preparation method for β-Ga₂O₃ powder with a shortened process design was developed to address the limitations of conventional synthesis methods for this material. First, during precursor preparation, only gallium (Ga, purity 99.99%) was used as the reactant, with ultrapure water as the reaction solvent. No other impurity ions or organic solvents were introduced. Using 2 g of Ga, 10 mL of H₂O, a reaction temperature of 200 ℃, and a reaction time of 4 h, the rod-shaped Ga₂O₃ precursor, GaOOH, was synthesized via a subcritical heterogeneous reaction. This preparation stage offers the advantages of a low raw material cost, environmental friendliness, and short process flow. During the subsequent calcination and transformation, the GaOOH precursor decomposed into α-Ga₂O₃ at approximately 400 ℃. With an increase in the temperature to 700–800 °C, the α-Ga₂O₃ phase transformed into β-Ga₂O₃, ultimately yielding a product with a purity exceeding 99.9%. Thus, this study achieves the short-process, green, and low-cost synthesis of 99.9% purity β-Ga₂O₃ powder using only metallic Ga and ultrapure water, providing a new raw material preparation route for β-Ga₂O₃.

DOI：

https://doi.org/10.1016/j.mtcomm.2026.115374