Liquid Bismuth Calorimetry: Enthalpies of Solution of Copper, Indium, and Tellurium, and Enthalpies of Formation of Cuprous Selenides

Abstract

An isoperibol liquid metal solution calorimeter in which samples are introduced below the surface of the melt is described. Enthalpies of solution in liquid bismuth at ca. 625°K in kcal mol⁻¹ were found to be +0.99 ± 0.05 for copper, −1.41 ± 0.08 for indium, and −1.16 ± 0.07 for tellurium.Enthalpies of formation in kcal mol⁻¹ at 625°K of cubic cuprous selenides are −7.98 ± 0.20 for Cu_1.80Se; −7.80 ± 0.19 for Cu_1.85Se; −5.92 ± 0.20 for Cu_1.90Se; −5.29 ± 0.20 for Cu_1.95Se; and −5.21 ± 0.14 for Cu_2.00Se.