| Abstract: | New Results on the Chemical Transport of CuO and Cu2O The preparation of CuO crystals by chemical transport reactions with HCl is already well known, a comparison with other transport agents based on the principal of thermodynamic equilibrium and also the rate of transport was missing up to now. We report about experiments with the transport agents HgCl2, Cl2, I2, Nh4Cl, or CuCl; the quantitative evaluation was made by means of the cooperative transport model on the basis of the free energy function. By this way it is possible to find favourable experimental conditions for the suitable transport agents at the outset. It turned out that HgCl2 is an appropriate transport agent which can easily be weighed. Also I2 is useful, whereas the effect fo transport with Cl2 (1 atm/298 K), CuCl, or NH4Cl is very small. We investigated the chemical transport of Cu2o and the conditions for the change of its direction of transport. |
