The Entropies of Fusion For Group Vb and VIb Metals

Abstract

AbstractBased on the vacancy theory for the fusion process, the entropies of fusion of group Vb and VIb metals were assessed by means of their physical properties in the solid and liquid states. The total entropy is divided into contributions from the interactional, configurational, volumic and vibrational changes. The entropies of fusion calculated in this manner were found to be in agreement with our experimental results performed by levitation calorimetry. The higher values of the entropies of fusion of the Vb and VIb group metals relative to those given by Tammann's rule are considered to be due to the increased vibrational contribution and bonding characteristics. Resume En se basant sur la theorie lacunaire du procede de fusion, les entropies de fusion des metaux des groupes Vb et VIb ont ete estimees a partir de leurs proprietes physiques dans les etats solides et liquides. L'entropie totale est divisee en plusieurs contributions provenant des changements interactionnels, configurationnels, volumiq...