ac and dc conductivity studies of pelletised 12-tungstophosphoric acid and 12-tungstosilicic acid hexahydrates

Ionic conduction in pelletised 12-tungstophosphoric acid and 12-tungstosilicic acid hexahydrates has been examined using ac and dc techniques. The studies definitively assign a protonic conduction mechanism, with evidence for conduction via crystallite surfaces. With blocking electrodes, σ (298 K) v...

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Bibliographic Details
Published inSolid state ionics Vol. 38; no. 3; pp. 207 - 211
Main Authors Slade, Robert C.T., Pressman, Helen A., Skou, Eivind
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.05.1990
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Summary:Ionic conduction in pelletised 12-tungstophosphoric acid and 12-tungstosilicic acid hexahydrates has been examined using ac and dc techniques. The studies definitively assign a protonic conduction mechanism, with evidence for conduction via crystallite surfaces. With blocking electrodes, σ (298 K) values are ≈ 10 −4 S cm −1 with Arrhenius-type temperature dependences. With reversible electrodes, conductivities increase with increasing relative humidity of flow gas. dc conductivities are slightly lower than ac values because of electrode polarisation.
ISSN:0167-2738
1872-7689
DOI:10.1016/0167-2738(90)90422-N