Abstract: In this article the colloidal chemistry of PZT powders in aqueous solution, the rheological behaviors of the PZT suspension and the influence of dispersants
on the rheology of the suspension and on the electrical properties of the gelcast PZT samples were investigated in comparison with those of die pressed
ones. The results show that because the electrical properties of PZT are very sensitive to their composition, unsuitably selected dispersants can result in the deterioration
of the electric properties of the material although concentrated PZT slurry with low viscosity can be obtained by different dispersants. The results also
indicate that the influence of the additives on the properties of the samples should be considered when gelcasting is applied to the forming of electronic
ceramics.

Key words: piezoelectric ceramic, gelcasting, electrical properties