Chemical vapour transport of ternary oxides in the system Ni/Mo/O

The chemical vapour transport behaviour of the phases in the Ni/Mo/O system has been investigated using Cl-2 and Br-2 as transport agents in a temperature gradient 1173 to 1073 K. Single crystals of Ni2Mo3O8, NiO and MoO2 have been obtained, while the deposited NiMoO4 crystals are destroyed during cooling down to room temperature due to a phase transition. 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 thermo dynamical model calculations. The influences of source composition, transport agent and the moisture contents are described in detail.

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