Specific Features of Preparation of Dense Ceramic Based on Barium Zirconate

In the present work the BaZr0.8Y0.2O3-delta samples were synthesized by traditional ceramic (solid-state method), citrate-nitrate methods as well as co-precipitation of hydroxides. Among them, the citrate-nitrate combustion method was found to be the optimal one because the obtained powder calcined at 1150 degrees C is single-phase and characterized by high dispersion. It is shown that the transition from solid-state method to wet chemical ones promotes the decrease of the powder particle size from similar to 680 nm to 75 nm, respectively. However, at the same time the relative densities of the samples sintered at 1450 degrees C do not exceed the 67%. The dense ceramic (90.2%) was obtained by combination of the citrate-nitrate method and the addition of 1 wt % Co3O4 as a sintering aid to the precursors.