Influence of interface structure on mass transport in phase boundaries between different ionic materials Experimental studies and formal considerations |
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Authors: | Carsten Korte N Schichtel D Hesse and J Janek |
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Institution: | (1) Physikalisch-Chemisches Institut, Justus-Liebig-Universit?t Gie?en, Giessen, Germany;(2) Max-Planck-Institut f?r Mikrostrukturphysik, Halle (Saale), Germany |
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Abstract: | Abstract Internal and external interfaces in solids exhibit completely different transport properties compared to the bulk. Transport
parallel to grain or phase boundaries is usually strongly enhanced. Transport perpendicular to an interface is usually blocked,
i.e., transport across an interface is often much slower. Due to the high density of interfaces in modern micro- and nanoscaled
devices, a severe influence on the total transport properties can be expected. In contrast to diffusion in metal grain boundaries,
transport phenomena in boundaries of ionic materials are still less understood. The specific transport properties along metal
grain boundaries are explained by structural factors like packing densities or dislocation densities in the interface region.
In most studies dealing with ionic materials, the interfacial transport properties are merely explained by the influence of
space charge regions. In this study the influence of the interface structure on the interfacial transport properties of ionic
materials is discussed in analogy to metallic materials. A qualitative model based on the density of misfit dislocations and
on interfacial strain is introduced for (untilted and untwisted) phase boundaries. For experimental verification, the interfacial
ionic conductivity of different multilayer systems consisting of stabilised ZrO2 and an insulating oxide is investigated as a funtion of structural mismatch. As predicted by the model, the interfacial conductivity
increases when the lattice mismatch is increased. |
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