ChemInform Abstract: GLEICHGEWICHT IM SYST. IN‐BR2

Abstract

Oberhalb von ca. 400°K reagiert In mit Br, unter Bildung von InBr.

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

“…Thus, we are led to conclude that the chemical transport in the vapor transport system under consideration is due to the selective reaction (39) (40) as confirmed by the data reported in [53,[57][58][59][60][61][62][63]. (In reaction (39), In cond stands for indium in a condensed phase, e.g., in a sulfide).…”

“…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.…”

“…Those experiments were run for 5 days, the temperatures were varied in the ranges T 2 = 673-1273 K and ∆T = T 2 -T 1 = 100-600 K, and the indium halide concentration was from 0.15 to 2.1 mol/m 3 . The reason for the lack of transport is that, above 673 K, reaction (39), with the participation of pure liquid indium, is shifted almost entirely to the right [59][60][61], and the equilibrium constant (40) tends to infinity. Accordingly, the vapor phase contains little or no In 2 Hal 4 , a vapor species capable of bringing the halogen back to the source (getter), and indium transport proves impossible.…”