Abstract
The solid state interaction of the Zn 1− x Co x O nominal system is investigated by means of diffusion couples and analysis of co-precipitated samples. The formation of a homogeneous Co:ZnO solid solution is found to be determined by the crystal structure from which Co II ions diffuse into the wurtzite lattice. No diffusion is observed whenever the CoO rock-salt structure is formed from the Co II precursor. On the contrary, the diffusion from the Co 3O 4 spinel phase is feasible but has a limited temperature range defined by the reduction at a high temperature of Co III–Co II, since this process again leads to the formation of the rock-salt structure. However, when using a highly reactive and homogeneous co-precipitated starting powder, neither the spinel phase nor the rock-salt structure is formed, and a Co II:ZnO solid solution is obtained, which remains stable up to high temperatures.
Published Version
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