Far-infrared absorption of sodium β alumina

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Abstract
As-grown sodium beta alumina is non-stoichiometric and shows strong absorption in the region 20-200 cm-1 with partly resolved structure. The authors show that in material close to stoichiometry sharp absorption lines are observed in the same spectral range. They conclude from these studies that a sharp intense peak at 59 cm-1 is due to vibrations of Na+ ions near singly occupied Beevers-Ross sites. They suggest that other absorption peaks in the far infrared are due to complexes involving sodium ions and charge-compensating interstitial oxygen ions, and propose that complexes responsible for absorption at 102 cm-1 are particularly effective in contributing to the ionic conductivity.