Chemischer Transport von Eisensulfid. II. Experimentelle Ergebnisse beim Transport von FeS_x mit Jod

Abstract

Eisensulfid FeSx läßt sich durch chemischen Transport mit Jod in einkristalliner Form abscheiden. Voraussetzung für die Transportierbarkeit ist ein genügend hoher Schwefelpartialdruck, gleichbedeutend mit x ≳ 1,04. Die Transportgeschwindigkeit und die Form der abgeschiedenen Kristalle hängen von Temperatur, Transportmittelmenge und von der Bodenkörperzusammensetzung ab. Die erwarteten Unterschiede in der Zusammensetzung des abgeschiedenen Bodenkörpers und des Transportrückstandes werden experimentell bestätigt.

Chemical Vapor Transport Reactions – A Historical Review

“…[81][82][83][84] . They realized that the composition of a binary compound AB x deposited at the sink is determined by the ratio of the fluxes J(B) and J(A) from the source to the sink (Equation (6)).…”

Chemical vapor transport of zinc sulfide

“…At low argon pressures and at low iodine concentration, it increases sharply up to a maximum value, especially in the case without inert gas. This maximum is evident in the literature [19,24,25,51,52]. Subsequently, the rate decreases in this case with increasing iodine concentration.…”

“…In several cases, the theoretical transport rate including the convection regime is given in comparison with experimental data as a function of the total pressure [28,30]. From a practical point of view, it is advantageous if the transport rate of ZnS is calculated as well as measured as a function of the accessible iodine concentration [19,21,24,25], as has been done for other compounds, too [49][50][51][52][53][54].…”

Chemical Vapor Transport Reactions – Arguments for Choosing a Suitable Transport Agent

“…[24][25][26]29] It is simplifying assumed that the amount of solid at the source is infinitely large or the duration of transport infinitely short and that therefore the stationary state practically does not change (quasi-stationary transport). In the quasi-stationary state, the composition of the solid AB x in the sink is determined by the Z. Anorg.…”

“…Chem. 2017, 1295-1311 www.zaac.wiley-vch.de ratio of the flows of A and B, but not, however, by the ratio of their balance pressures: (26) (2) The cooperative transport model by Schweizer and Gruehn aims especially at the description of the time-dependent migration of multiphase solids in a temperature gradient. [30] Here, the complete transfer of the source solid to the sink and therefore a change in composition of the solids at source and sink with time is dealt with (non-stationary transport).…”