. Can. J. Chem. 70, 2699 (1992). The transport of gaseous In(1)I in an argon camer gas was studied in the temperature range 723-887 K by the modified entrainment method. Combination of the entrainment results with a literature equation for the total vapour pressure above the liquid gave the following expressions for the temperature dependence of the vapour pressures of the monomer
IntroductionThere is considerable current interest in the thermodynamics of the complexation and polymerization of gaseous metal halides (1). Much of this interest is engendered by the lamp industry (2), which makes extensive use of these halides, e.g., of In, Na, Sc, Sn, etc., as dopants within the envelope of the current generation of "metal halide" mercury discharge lamps. Their presence improves significantly the spectral distribution and colour rendition of the discharge. Before the discharge is struck, the halide is present as a condensed phase and knowledge of its vaporization thermodynamics is crucial to proper lamp design. There has been a recent study (3) of the total vapour pressure over liquid indium(1) iodide from 646 to 958 K by quasi-static vapour pressure manometry. The results from this study have been used in combination with an examination of In(I)I(l) from 723 to 887 K by modified entrainment to yield separate vapour pressure equations for the monomer and dimer species. The techniques and data analysis are similar to those used in a recently reported study (4) of indium(1) bromide.