Abstract
Dependence of electronic and ionic components of conductance of CsHSO4–SnO2 systems on their composition is studied using the method of electrochemical impedance. The total electronic and ionic components of conductance nonmonotonically depend on the composition. To describe completely impedance diagrams of composite materials, an equivalent electrical circuit is proposed, which contains the bulk ionic conductance corresponding to the bulk of CsHSO4 grains, and the conductance corresponding to the surface of tin dioxide grains. Each conductance component is separated out. The activation energies for the bulk and surface conduction equal 0.32 ± 0.02 and 0.36 ± 0.02 eV, respectively, and are independent of the system composition. The bulk ionic conductance monotonically decreases with increasing SnO2 content and is well described wit percolation theory, whereas dependences of surface ionic and total electronic components have extremums.
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