Abstract
Structural characteristics of β-alumina type compounds are investigated by comparing them with those of isomorphous compounds in the BaO-Fe2O3-MeO system (where Me represents a spinel-forming divalent ion) and by observing the lattice images of a series of β-alumina type compounds by transmission electron microscopy. The results suggest that the stoichiometry of β-alumina is fixed but is far from the idealized formula Na2O·11Al2O3 and that the existence of the solubility range is due to its structural characteristics to accommodate mixed periods in the structure rather than to a change in the Na composition in the “defect” layer. The results also suggest that the charge distribution in the crystal should be balanced locally. The Beevers-Ross structure for β-alumina has been reexamined from this point of view to understand the charge compensation involved in the excess Na ions.
This work was supported by the National Science Foundation Grant DMR 7502959 and MRL Program DMR 7203018A4.
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© 1976 Plenum Press, New York
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Sato, H., Hirotsu, Y., McCoy, J.K. (1976). Structural Characteristics and Non-Stoichiometry of β-Alumina Type Compounds. In: Mahan, G.D., Roth, W.L. (eds) Superionic Conductors. Physics of Solids and Liquids. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-8789-7_49
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DOI: https://doi.org/10.1007/978-1-4615-8789-7_49
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