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Β’’-Alumina (Rhombus: R3m) and β-Alumina (Hexagonal: P63/mmc) are two different crystal structures. The chemical composition of β-Al2O3 and β''-Al2O3 and the stacking order of oxygen ions between the ion-conducting layers are different. Al2O3, β-alumina is an accumulation of 2 spinels, and β”-alumina is an accumulation of 3 spinels. The ionic conductivity of the beta phase is higher than that of the beta phase because it contains more Na+. As a traditional sodium ion conductor material, NA-β’/β”-Al2O3 is widely used in membranes and electrolytes of Na/S batteries and solid-state sodium ion batteries.

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    Beta alumina

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Beta alumina

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