  In the paper Proposed model for calculating the standard formation enthalpy
of binary transition-metal systems, Zhang and Liu proposed to modify the
standard Miedema model. This, to include atomic size effects by a prefactor
S(c). After applying formulae proposed by Zhang and Liu, it was not possible to
reproduce their results. So, their equations were analyzed, and it was found
that the results can be reproduced if the equation for the prefactor S(C) is
modified.It is shown that the equation of S(C) can be expressed in an
alternative way, in which the difference of surface area is eliminated. Then,
the difference in size of the atoms, expressed as a difference in surface area,
the justification stated by Zhang and Liu for the introduction of S(c), is no
longer present after the analysis.
