Density of Ga₂O₃ Liquid

The density of Ga₂O₃ liquid in equilibrium with air has been measured at 1800₀ to 1900₀C using an Ir double‐bob Archimedean method. The data yield the following description of the density of Ga₂O₃ liquid: ρ= 4.8374(84)–0.00065(12)(T −1850₀C). This density‐temperature relationship is compared with the partial molar volume of Ga₂O₃ in glasses in the systems CaO–Ga₂O₃–SiO₂ and Na₂O–Ga₂O₃–SiO₂, corrected to the glass transition temperature using thermal expansivities. The comparison illustrates that a positive excess volume term is required in these systems at low temperature. This observation is similar to those deduced from studies of the partial molar volumes of Fe₂O₃ and Al₂O₃ in silicate melts.