Abstract: | Transport effect of HCl on NiO and MgO according to between T2 = 1000°C and T1 = 800°C was calculated by the model of diffusion in dependence of total pressure; for comparison, the classical transport of α-Fe2O3 was analogously treated. By experimental determination of the transport rates at total pressures from 0.009 to 6 atm hitherto not considered influences of the amount and surface of the starting material, and of the transport time were found. These effects are explained by a (not in detail defined) term of ?sorption”? of the transport gas onto the powder of the starting material. For an explanation of the transport rates estimations of the diffusion coefficients of the gas pairs FeCl3–HCl and NiCl2–HCl were performed and the vapour pressure diagrams of NiCl2 and MgCl2 evaluated. |