The structural properties of sodium aluminates (beta‐aluminas) as ionic conductors have been studied. The
Al2O3
‐diagram for
Al2O3
above 84 mole per cent between 1100° and 1600° is described. The fabrication of closedend tubes (for use as battery electrolyte) by electrophoretic deposition is shown to give a useful and reproducible product. Finally, the physical and electrical properties of sodium‐conducting ceramics prepared in this way are evaluated.
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