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Kemijski inštitut, Ljubljana (KILJ)
  • Impact of particle size on conductivity and storage capacity as derived from the core-space charge model
    Jamnik, Janko
    The impact of interfaces on variety of materials properties scales with the density of interfaces within a material. This statement holds true independentof the specific interfacial mechanism, as ... long as the density of interfaces is rather low. If the spacing between interfaces is being further reduced, interesting non-trivial effects are expected and have also been observed. In this paper, the ionic conductivity in ionic conductors and the storage capacity (non-stoichiometry) of mixed conductors as a function of sizeare considered. The discussion is based on the core-space charge model in which we assume that only the core of an interface exhibits its own defect energetics, while the energetics of the space charge layers remain unaltered (compared to the bulk). It is shown that in the case of Schottky profiles anomalous conductivity effects are predicted. As regards the non-stoichiometryeffects, it is demonstrated that at sizes small compared to the Debye length the difference between a composite consisting of an ionic andan electronic conductor and a true mixed conductor becomes blurred. The latter effect has recently been detected in the field of Li-batteries and is here commented on.
    Vir: Solid State Ionics 15 : Proceedings of the 15th International Conference on Solid State Ionics, Part II, Baden-Baden, Germany, 17-22 July 2005 (Vol. 177, issues 26-32, 2006, str. 2543-2547)
    Vrsta gradiva - prispevek na konferenci
    Leto - 2006
    Jezik - angleški
    COBISS.SI-ID - 3674650

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