The critical analysis and mutual coherence of the thermodynamic data of the AIIIBV phases

The optimisation of thermodynamic properties for 17 AIIIBV compounds has been obtained for the first time by means of a novel correlative method. The maximum melting temperatures and sums of atomic numbers (ZA + ZB) of the isostructural phases are shown to be very important parameters in this approach to the thermodynamic analysis. A critical analysis and recommendations regarding the most realistic experimental and calculated data are presented. A set of the enthalpies of formation (±0.4 kJ/mol-at), free enthalpies (±0.5–1.0 kJ/mol-at), standard entropy (±0.5–1.0 J/(K mol-at)), entropies of formation, and heat capacity (±0.2–0.4 J/(K mol-at)) of AIIIBV compounds have been obtained. The similarity of the functions Cp(T) for the AIIIBV phases with the same sums of atomic numbers is also discussed. Thermodynamic properties of unknown semiconductor TlN, as well as insufficiently known compounds BP and BAs, have been evaluated with the proposed method. The proposed correlative method is also applicable for any isostructural phases (the systems AIII–BV, AII–BVI, RE-Me, and other compounds) and can be used for the critical analysis of their thermodynamic or physico-chemical properties.