Sodium Cobaltate is in the same family of compounds as the battery material Lithium Cobaltate, and the fact that sodium is more abundant than lithium makes it an attractive alternative. NMR measurements have shown that the sodium ions are mobile at high temperature, and a recent study using novel neutron powder diffraction techniques has detected diffusing sodium ions away from their regular sites via Fourier density maps. Here we propose to extend this approach to single crystals, allowing us to study the effect in relation to the superstructure of the material and, therefore, allowing us to understand the diffusion pathways. Single crystal neutron diffraction measurements will be performed at a range of temperatures allowing us to visualise the onset of diffusion and its relation to the superstructure.