Abstract
Phase relationships in Au–Ho and Au–Tm binary systems have been thermodynamically assessed by using the CALPHAD technique. The existing thermodynamic descriptions of the systems were improved by incorporating the ab initio calculated enthalpies of formation of the intermetallic compounds (IMCs) to the assessment. All the binary intermetallic compounds were treated as stoichiometric phases, while the solution phases, including liquid, fcc, and hcp, were treated as substitutional solution phases. Furthermore, the excess Gibbs energies were formulated with the Redlich–Kister polynomial function. As a result, two self-consist thermodynamic data sets for describing the Au–Ho and Au–Tm binary systems have been obtained.
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