Composite electrolytes of the form (1-x)CsHSO4-xSiO2, where x ranged from 0 to 0.8, were investigated. The low-temperature conductivity, as a function of x, exhibited a maximum; at which the magnitude was 2.5 orders of magnitude higher than that of pure CsHSO4. It was deduced that the conductivity was controlled by protons. Heterogeneous doping was shown to change markedly the thermodynamic parameters of the ionic component. The phase transition temperature of the composites decreased from 414 to 350K with increasing SiO2 content. As x was increased, amorphization occurred and the relative change in ionic conductivity at the phase transition decreased.

V.G.Ponomareva, N.F.Uvarov, G.V.Lavrova, E.F.Hairetdinov: Solid State Ionics, 1996, 90[1-4], 161-6