Samples of Ag2xNa2(1-x)ZnSiO4, where x was between zero and unity, were characterized by means of X-ray powder diffractometry. The ionic conductivity was determined, as a function of composition and temperature, by means of impedance measurements. It was found that none of the compositions exhibited any appreciable deviation from the rather similar conductivities of the end-members. Neither the activation energy nor the pre-exponential factor varied greatly as a function of composition. It was concluded that a mixed-alkali effect upon the conductivity of cristobalite-related structures was related to size differences of the ions rather than to mass or polarizability differences.

J.Grins, T.Hoerlin, G.Vaivars: Solid State Ionics, 1996, 89[1-2], 1-4