The orientationally disordered stable and metastable mixed crystals of the two-component system (CH3)CCl3 (1,1,1-trichloroethane) + CBrCl3 (bromotrichloro-methane) have been characterised by means of X-ray powder diffraction and thermal analysis techniques. The thermodynamic assessment coherently reproduces the melting equilibria (the stable [R + L] and the partially metastable [FCC + L])and provides a coherent set of data for the thermodynamic properties of non-experimentally available phase transitions of pure compounds which agree perfectly with those properties obtained from the pressure-temperature phase diagrams. (C) 2004 Elsevier B.V. All rights reserved.