THERMODYNAMICS OF THE SYSTEMS OF THE PLATINUM METALS WITH OTHER TRANSITION-METALS .1. INTEGRAL DATA

A critical assessment is presented of the integral thermodynamic data of about 190 intermetallic compounds of 62 binary systems of the platinum metals Ru, Rh, Pd, Os, Ir and Pt with other transition metals. The Gibbs energies of formation were obtained mainly from emf measurements on galvanic cells or vapour pressure experiments by the Knudsen method. The enthalpies of formation were evaluated from calorimetric work. The compilations of the results as a function of the temperature include graphs and numerical data. Empirical enthalpy of formation-entropy of formation correlations and calculations of the excess entropy contributions of the intermetallic compounds by use of their heat capacities at low temperatures are outlined. Relationships between enthalpies of formation and lattice contractions of different structure types of the compounds are given. The experimental results of the enthalpies of formation are compared with the quantities predicted by the Miedema model. The particularities of the actinides and the influence of different crystal structures of the compounds are discussed.