Empirical Relation of Melting Temperatures of CsCl-Type Intermetallic Compounds to Their Cohesive Energies

An empirical linear relationship between melting temperatures and cohesive energies, which was first derived on the basis of the universal binding energy theory and the Debye model, is reexamined by using 78 pure element solids. The results show that, although a general trend is observed, many elements deviated far from this regularity. However, it is further found that this empirical relationship works very well for element solids that have a common crystal structure (e.g., bcc). Similar behaviors are observed among intermetallic compounds of the same structure. For CsCl-type intermetallic compounds the obtained linear relationship is Tm = 0.030ΔE/kB, which may be applied to predict the melting point of unknown alloys.