Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9761732 | Solid State Ionics | 2005 | 5 Pages |
Abstract
Cs5H3(SO4)4·yH2O and (1âx)Cs5H3(SO4)4/xSiO2 composite electrolytes (x=0.3-0.9) have been investigated by means of impedance, IR and Raman spectroscopy, differential scanning calorimetry and X-ray analysis. Cs5H3(SO4)4·yH2O has a phase transition to a high-conductive disordered state (Ïâ¼10â2 S cmâ1) at Ttr=418 K induced by changes in the structural-water content. This phase transition is shown to be reversible yet the converse transition from the high-temperature phase is slow. Although heterogeneous doping causes only a moderate increase in the low-temperature conductivity of the ionic salt, it stabilizes the high-conductive disordered state. The vibration spectroscopy data confirm the formation of the Cs5H3(SO4)4 disordered state in composites. The composite conductivity does not depend on the composition up to x=0.7 and decreases at xâ¥0.8 due to the percolation effect. The structural dynamics of SO4 tetrahedra is shown to correlate with the proton conductivity.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
G.V. Lavrova, V.G. Ponomareva, E.B. Burgina,