THE CELL MODEL FOR INTERSTITIALS IN BINARY SUBSTITUTIONAL SOLID-SOLUTIONS

The thermodynamic properties of interstitial solute atoms in a substit utional binary solvent matrix have been derived in terms of the cell m odel for such solutions. The results pertain to low temperatures where the solute distribution is governed by Fermi-Dirac statistics rather than the Boltzmann distribution usually employed in the high-temperatu re limit. The thermodynamic functions, calculated by numerical methods , exhibit singularities concomitant to the successive occupation of ce lls of a given energy level. The relevance of the results to the therm odynamics and kinetics of highly mobile interstitial atoms is discusse d. (C) 1997 Elsevier Science Ltd.