Abstract
The order-discorder transition of binary interstitial alloys has been reviewed for the IVA transition metals (titaniuim, zirconium and hafniuim)-oxygen solid solutions. The order-disorder transition models for binary interstitial alloys are lacking, compared to binary substitutional alloys as described in the previous paper. The experimental entropy changes due to the order-disorder transition for binary interstitial alloy are compared to the theoretical values calculated by using statistical thermodynamics. In this paper, heat capacity anomaly in non-equilibrium state observed below the order-disorder transition temperature has been also reviewed.
