Drop Calorimetric Measurements on Binary Bi–In System

Abstract

Measurements of integral enthalpies of mixing of Bi–In system have been taken at 767, 813 and 855 K by a drop calorimeter over the entire composition range. Bismuth was used as the base metal, and indium was dropped by motorized dropping device. Calibration of the calorimeter was done by dropping four pieces of α-Al2O3 at the drop temperatures. The measured enthalpies of mixing are plotted against indium composition and found exothermic in nature for all the compositions. The minimum enthalpies were observed in the range of compositions xIn ~ 0.40–0.50. A slight temperature dependency of enthalpy was observed for each composition. The experimental data were used to determine the binary interaction parameters using Redlich–Kister polynomial at 767, 813 and 855 K. © 2018, Springer Science+Business Media, LLC, part of Springer Nature.