SOLID-STATE ELECTROCHEMICAL STUDY OF IN-SB LIQUID ALLOYS

The indium activity in liquid In-Sb solutions is measured in high temperature solid-state galvanic cells. The measurements indicate a moderate negative deviation from ideal solution behavior. The results are compared with the available calorimetric and phase-diagram determinations and are found to be consistent with them. An expression for the standard Gibbs energy of formation of solid InSb is presented that is consistent with the direct emf measurements, calorimetric studies, reported phase diagram, and results of this study. The nonrandom two-liquid theory is found to adequately represent the liquid mixture thermodynamic data.