Abstract: The influences of chemical composition and fabrication technology of forming powders on sintering density, Na-ion conductivity
and microstructure of β’’-Al₂O₃ ceramics were investigated. Compared with water-based slurry, ethanol-based slurry was more stable
and could be prepared more easily. Moreover, the latter had better stability to moisture and chemical homogeneity, and the agglomerates
could be crushed at a lower pressure. Thus, higher green densities could be obtained. High quality β’’-Al₂O₃ ceramics with densities
>3.23g·cm^-3, and resistivities of 5～6Ω·cm at 300℃　and homogeneous microstructures were　prepared with such powder spray dried from ethanol-based
slurry which was composed of two components, namely Li₂O-Al₂O₃ and Na₂O-Al₂O₃ calcinated at 1250℃ for 2h. respectively. The
contents of Li₂O and Na₂O in the resulting powders were variable in the ranges of 0.69～0.75wt% and 8.85～9.10wt%.

Key words: β’’-Al₂O₃, forming powder, spray drying