Beiträge zum thermischen Verhalten von Sulfaten. XIII. Zum chemischen Transport von Cr2(SO4)3 mit Cl2 und mit HCl. Experimente und Modellrechnungen

Contributions on the Thermal Behaviour of Sulfates. XIII. The Chemical Vapour Transport of Cr₂(SO₄)₃ with Cl₂ and with HCl. Experiments and Calculations Well shaped crystals (cubical or rectangular parallel-epiped respectively, edge length up to 1 mm) of rhombohedral Cr₂(SO₄)₃ can be grown in the less hot zone of a closed silica ampoule by means of CVT using Cl₂ or HCl as transport agents in endothermal transport reactions. The influence of the mean transport temperature as well as the concentration of the transport agents on the deposition rates was investigated. On the basis of thermochemical calculations an explanation of the transport mechanism is given in the present paper.