Thermodynamic description of the Ga-Yb binary system

¹ Centre régional des métiers de lʼenseignement et de la formation, Agadir, Maroc
² Laboratoire de Physicochimie de lʼEtat Solide, Université de Paris-Sud, Orsay Cedex 91405, France

Abstract

Pure gallium metal and many gallium based alloys and intermetallic compounds have extensive technological applications and fundamental interest. Gallium is used as a doping component in electronic devices (as in transistors or photovoltaic cells) [1]. The development of multi-alloy material depends nowfor most of them on preliminary numerical simulations. Such simulations are only useful when accurate thermodynamic databases are available. Such databases are developed by the CALPHAD (CALculation of PHAse Diagram) method on a basis of experimental thermodynamic and phase diagram measurements. The excess term of the Gibbs energy of the liquid phase was assessed with the recent exponential temperature dependence of the interaction energies by Kaptay [2–4] and compared with the Redlich-Kister [5] polynomial equation results. The calculations based on the thermodynamic modelling and optimisation are in good agreement with the phase diagram data availablein the literature.