Effect of redox potential of added metals and ultrasound irradiation on the oxidation behavior of gallium-based liquefied alloys

抄録

This paper investigated the effect of two-step ultrasound irradiation (miniaturization and oxidation) on various gallium-based liquefied alloys in ethanol and hydrazine monohydrate at 60 °C. The miniaturization and oxidation behavior of the liquefied alloys were analyzed. In the Ga-based alloy system, the miniaturization process was not as efficient as that of pure gallium due to changes in corrosive properties, surface tension, and viscosity caused by the addition of other metals. In the oxidation step, nanosized crystal grains were abundantly generated at the initial stage, and metal-doped γ-Ga₂O₃ was finally obtained in the Ga–Al and Ga–Mg systems. However, in the Ga–Ag system, the alloy’s oxidation rate was slow, and Ag-doped γ-Ga₂O₃ was not obtained. These results suggest that the redox potential of added metals significantly affects the oxidation behavior. By utilizing this phenomenon, it is possible to synthesize γ-Ga₂O₃ nanoparticles with controlled composition and morphology.