Abstract
The holmium–nickel binary system has been thermodynamically assessed by means of the Thermo-Calc software. The Redlich–Kister (Ind Eng Chem 40:345–348, 1948) polynomial was used to describe the solid and liquid solution phases. Seven intermediate phases, Ho3Ni, Ho3Ni2, HoNi, HoNi3, Ho2Ni7, HoNi5, and Ho2Ni17 were treated as stoichiometric phases. The intermetallic compound HoNi2 in this binary system which has a homogeneity range was treated by a two-sublattice model (Sundman et al., Calphad 9:153–190, 1985; Hillert and Staffansson, Acta Chem Scand 24:3618–3626, 1970). The parameters of the Gibbs energy expressions were optimized according to all the available experimental information of both the equilibrium data and the thermodynamic results. The calculated phase diagram agrees very well with the experimental values from the literature.
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