The thermodynamics of the vaporization of liquid indium(I) iodide by modified entrainment

Abstract

. 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.

Development of the Chemistry of Indium in Formal Oxidation States Lower than +3

“…6%. 275 Vaporization has been investigated in some detail, 263,276 having regard to the use of the halides as dopants within the envelope of mercury discharge lamps.…”

Chemical vapor transport as a means of controlling the composition of condensed phases

“…As the transporting agent, we used chlorine (in the form of InCl), first, because indium chlorides have higher vapor pressures than do bromides and iodides [59][60][61]67] and, second, because, by analogy with halides of some elements (Ga, Ge, Si, and others), we assumed that the oxidized form of indium halides (In 2 Hal 4 ) would be more stable in the chlorine compound.…”

Resonant Coherent Anti-Stokes Raman Scattering Applied to Vapor Phase InI

“…Only the monomer of the molecule is considered here, because the dimer In 2 I 2 is a minority of about 2% in the vapor phase (12). InI therefore has an integral total spin S and the multiplicity 2S ϩ 1 is odd.…”