A NMR, conductivity and molecular dynamics study of AgI-Ag₂O-B₂O₃ glasses

Authors: Mustarelli, Piercarlo; Tomasi, Corrado; del Pilar Infante García, María; Magistris, Aldo

Source: Physics and Chemistry of Glasses - European Journal of Glass Science and Technology Part B, Volume 47, Number 4, August 2006 , pp. 484-488(5)

Publisher: Society of Glass Technology

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Abstract:

Fast ion conducting (FIC) AgI-based borate glasses xAgI:(1−x)[Ag₂O.nB₂O₃] (n=1, 2) were studied by means of ¹⁰⁹Ag solid-state NMR, impedance spectroscopy (IS) and molecular dynamics (MD) simulations. Diffusion coefficients in the range 10⁻⁸-10⁻¹⁰ cm²/s were obtained from conductivity data by means of the Nernst-Einstein equation. The activation energies for NMR line narrowing and d.c. conductivity differ by a factor of approximately ∼3. Standard (ST) and non-equilibrium (NE) MD investigations suggest that this difference is due to the effect of cooperative processes.

Document Type: Research article

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