A model for the fast ionic diffusion in alumina-doped LiI

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Lithium Iodide shows enhanced ionic conductivity when doped with a powder of the insulator, alumina. We extend Landauer's effective medium model to see if the observations are consistent with a high conductivity layer forming on each non-conducting particle. The predictions are consistent with experiment provided one assumes the layer a few hundred Angstroms thick. At the outside, away from the particle, the enhancement of conductivity should fall off slowly, as in Debye-Huckel screening, whereas it is possible a new phase forms close to the insulator surface. © 1979.




Stoneham, A. M., Wade, E., & Kilner, J. A. (1979). A model for the fast ionic diffusion in alumina-doped LiI. Materials Research Bulletin, 14(5), 661–666. https://doi.org/10.1016/0025-5408(79)90049-7

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