The preparation and vapour pressures of the indium(I) halides and the standard molar Gibbs free energy change for formation of InX from In(g) and X 2(g), (X = Cl, Br, or I)

Abstract

The syntheses of high-purity InCl, InBr, and InI from the elements are outlined. The vapour pressures above the liquid indium(I) halides have been measured by the quasistatic method over the ranges: InCl, 528 to 914 K; InBr, 569 to 950 K; and InI, 646 to 958 K. The molar enthalpies of evaporation of the indium(I) halides have been calculated by the second-law and third-law methods. The temperature variation of the changes in the standard molar Gibbs free energies for the formation of InX(s), InX(1), and InX(g), (X = Cl, Br, or I), from the gaseous elements have been derived.