On the chemical vapour transport in the Mg/Mo/O system - Experiments and model calculations

Single crystals of MgMoO4 and Mg2Mo3O8 have been obtained via chemical vapour transport in a temperature gradient 1273 to 1173 K using Cl-2 and Br-2 as transport agents. Pure powders of the ternary compounds have been used as starting materials as well as mixtures of three coexisting phases. The observed transport behaviour is compared with results of thermodynamical model calculations. The influence of source composition, transport agent and the moisture contents is described in detail.