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Journal Article

Impact of particle size on conductivity and storage capacity as derived from the core-space charge model


Jamnik,  J.
Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society;

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Jamnik, J. (2006). Impact of particle size on conductivity and storage capacity as derived from the core-space charge model. Solid State Ionics, 177(26-32), 2543-2547.

Cite as: https://hdl.handle.net/21.11116/0000-000E-FC68-2
The impact of interfaces on variety of materials properties scales with
the density of interfaces within a material. This statement holds true
independent of 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 size are 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-stoichiometry
effects, it is demonstrated that at sizes small compared to the Debye
length the difference between a composite consisting of an ionic and an
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. (c) 2005 Elsevier B.V. All rights reserved.