Study of Preparing β''-Alumina by Solid-State Synthesis

Abstract

In this paper, β''-alumina powders were prepared by solid-state synthesis method with different kinds of sodium compounds such as sodium carbonate, sodium bicarbonate, sodium oxalate, sodium acetate and sodium citrate. Each sodium compound was mixed with α-alumina by ball-milling, and then dried and calcined in muffle furnace, respectively. In order to confirm the superior condition for different sodium compound to prepare β''-alumina, original raw material with different powders molar ratio and calcination temperature were applied. The phase compositions of mixed powders after calcination were analyzed by X-ray diffraction (XRD). The results show that different kinds of sodium compounds which are just composed of sodium, carbon and oxygen all can be used as sodium source for preparing β''-alumina, but different sodium source compounds need different calcination temperature to form β''-alumina phase. And the molar ratio of sodium compound to α-alumina has an effect on the final content of β''-alumina.