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- W2017415274 abstract "Abstract A Monte Carlo method is developed for simulation of mixed ionic conductivity in β″-alumina-type materials. The conduction plane of these materials is represented by a lattice gas model in which monovalent and divalent cation carriers diffuse via a vacancy mechanism and interact through a nearest-neighbor coulombic repulsion. By comparing experimental data for pure Na+ and pure Ba2+ β″-aluminas with simulation results, it is possible to estimate the near-neighbor interaction energies ei and jump barriers Ui for both kinds of ions. On the basis of these estimations the total ionic conductivity of Na+Ba2+ β″-alumina is calculated as a function of temperature and concentration of carriers. As Ba2+ replaces Na+, the conductivity initially increases as more vacancies become available. For very high temperatures, this increase continues until exchange is complete; but at lower temperatures, the conductivity reaches a peak for some optimal Ba2+ Na+ composition, and then drops off as the number of Ba2+, and hence the strength of ionic correlation, goes up. The presence of ordering in the fully exchanged (all Ba2+) case manifests itself in substantial curvature of the Arrhenius plots for conductivity. The activation energy for conductivity as a function of Ba2+ mole fraction (XBa2+) shows a pronounced rise near an X value of 2 3 , in agreement with recent experimental observations." @default.
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- W2017415274 date "1985-06-01" @default.
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- W2017415274 title "Divalent and mixed divalent/monovalent conduction in β″-alumina: A Monte Carlo study" @default.
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- W2017415274 doi "https://doi.org/10.1016/0022-4596(85)90273-7" @default.
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