Abstract
The entropy approach to viscosity proposed by Adam and Gibbs underlines an exponential influence of the entropy difference between solid and liquid on the (undercooled) melt viscosity. We propose to consider two different trends for the specific heat difference between solid and liquid as for pure metallic melts and glass-forming metallic melts, which both support a discontinuity at the ideal glass transition temperature like the well-known empirical Vogel-Fulcher equation. In particular we check for two glass-forming alloys the possibility of simplifying the Dubey-Ramachandrarao approach in the evaluation of the entropic term with an hyperbolic dependence of the specific heat, already proposed by Angell for traditional glass-formers.