By Richard C. Alkire, Dieter M. Kolb
This can be a necessary publication for researchers in electrochemistry; it covers components of either basic and functional value, with stories of top quality. the cloth is especially good provided and the alternative of issues displays a balanced editorial coverage that's welcomed.
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Additional info for Advances in Electrochemical Sciences and Engineering, Vol. 8
An equivalent circuit consisting of two serial RCelements (inset) can be used to ﬁt the spectrum. ary (Sec. 1). However, from an impedance spectrum alone it cannot be judged how much grain boundary properties vary within the corresponding polycrystal. In this section, it is demonstrated that electrical measurements between microelectrodes on adjacent grains (Fig. 13a) can yield information about the distribution of grain boundary properties. Finite element calculations have been performed to simulate the impedance of experiments with ohmic (reversible) microelectrodes on adjacent grains [51, 265].
G. depressed bulk impedance arcs). Microelectrodes facilitate such local investigations of conductivity proﬁles and can therefore be a very useful tool in solid state ionics. This is demonstrated in Sec. 2 for the probably most typical inhomogeneity e¤ect in this ﬁeld, namely a spatially varying stoichiometry in an oxide. 2 Ju¨rgen Fleig Mixed Ionic and Electronic Conductivity The total bulk conductivity of an ionic solid can frequently be obtained from the high-frequency semicircle of an impedance spectrum; the determination of the partial ionic and electronic conductivities, however, requires further e¤orts.
1 Transport Properties of the Bulk Inhomogeneous Bulk Conductivities Owing to several reasons, bulk conductivities in ceramics are frequently inhomogeneous: i) If the surrounding or the temperature of an equilibrated ionic solid is changed, di¤usion processes are required to adjust to the new conditions. Since the di¤usion coe‰cients in ionic solids can be rather low, non-equilibrium situations – that means stoichiometry gradients – are often met, particularly at lower temperatures. The conductivity is closely related to the exact composition and such stoichiometry gradients are therefore often accompanied by conductivity gradients (cf.
Advances in Electrochemical Sciences and Engineering, Vol. 8 by Richard C. Alkire, Dieter M. Kolb