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Proton Conduction Through Interface Phase of CPAA/KDP Composites

Published online by Cambridge University Press:  01 February 2011

Dmitry Zakharyevich  and
Aleksey Neustroev
Dmitry Zakharyevich
Affiliation:
dmzah@csu.ru, Chelyabinsk State University, Chelyabinsk, Russian Federation
Aleksey Neustroev
Affiliation:
neustroevas@rambler.ru, Chelyabinsk State University, Chelyabinsk, Russian Federation
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Abstract

In this paper we present the results of the studies on proton conduction in composites polyantimonic acid (PAA)-potassium dihydrophosphate (KDP) obtained by precipitation technique as well as mechanical mixing. The highest conductivity (~10-2 Sm/sm at 300 K) is achieved in the precipitated samples with volume fraction of KDP close to f = 13 %. The results of X-ray diffraction showed the absence of reflections from KDP for the samples with f < 20% and slight change in the intensities of odd and even reflections from PAA, which is explained by the ion exchange between the phases through the interface. These indicate that conduction is occurred through the interface regions of the composite. The value of interface conductivity is estimated from the dependence of the composite conductivity on the volume fraction of KDP based according to the model by Uvarov et al. This gives σs ≈ 5 Sm/sm, however the equation derived in this model doesn't represent the experimental data properly. Probably the maximum of the dependence simply corresponds to the percolation through the interface's continuous cluster – it is close to the classical percolation threshold.

Keywords

compositeionic conductorsurface chemistry
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1256: Symposium N – Functional Oxide Nanostructures and Heterostructures , 2010 , 1256-N16-42
Copyright
Copyright © Materials Research Society 2010

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