Abstract
Niobium-doped lead zirconate titanate (PZT-Nb) thick films have been prepared by electrophoretic deposition from suspensions with different alcohol-based solvents, namely ethanol or mixtures of ethanol and 10 vol.% of a co-solvent: butanol or 2-butoxyethanol. The co-solvent addition results in a modification of the suspension's properties. As a consequence, under the same deposition conditions the rate of deposit formation changes for the suspensions with different solvents. The deposits show a homogeneous packing of the particles without any appreciable variation in their green density regardless of the variations in the deposition rate. Nevertheless, the deposits with a similar mass prepared from the different suspensions show distinct morphologies, some of them being considerably thicker at the edges than at the centre. The peculiarities in the thickness uniformity observed for the as-deposited layers are ascribed to changes in the resistivity of the deposits. After sintering, the thick films obtained from the different suspensions show particular microstructures which may be related to the morphology of the as-deposited layers. Dense films with a grain size of about 2–3 μm and an enhanced ferroelectric response were obtained from the suspension containing butanol.
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