Phase equilibria in the Ga- In- Ni system at 600 °C

Phase equilibria are established in the Ga-In-Ni system at 600 °C using X-ray powder diffraction (XRD) and electron probe microanalysis (EPMA). The system is characterized by a notable absence of ternary solubility among the constituent binary phases. The only exception is the phase Ni₂ln₃, which dissolves a maximum of 12.7 at% Ga. Two ternary phases exist in the compositional vicinity of γ TVi₁₃Ga₉ and Ni₅Ga₃, both of which contain approximately 10 at.% In. These phases are considered to be superlattice structures derived from that of the binary, high-temperature phase γNi₃Ga₂, which possesses a partially filled NiAs (B8₁) structure. The phase diagram isotherm determined in the present investigation was also compared with an isotherm calculated using experimental thermodynamic data for the constituent binary phases, which are available in the literature. The calculated and experimental isotherms agree well.