Abstract
Alkali (M)-β-aluminas were prepared by the soft chemistry method of gel-to-crystalline conversion (G–C) technique. The β-aluminas showed an extended compositional field of stability with respect to the alumina-content with increasing ionic radius of the alkali metal ions. Thus, the compositional stability of β-alumina is extended from M 2O/Al 2O 3 of 1:11 for Na + to 1:17 for K + and 1:22 for Rb +. High resolution electron microscopy (HREM) reveals that the decreasing concentration of alkali ions in the conducting planes is balanced by the changing widths of spinel blocks arising from the shift of tetrahedral Al 3+ to octahedral sites and the accompanying increase in stacking defects.
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