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000049700 084__ $$2WoS$$aElectrochemistry
000049700 084__ $$2WoS$$aMaterials Science, Multidisciplinary
000049700 1001_ $$0P:(DE-Juel1)VDB5958$$aMeyer, R.$$b0$$uFZJ
000049700 245__ $$aNonlinear electrical properties of grain boundaries in oxygen ion conductors - Modeling the varistor behavior
000049700 260__ $$aPennington, NJ$$bSoc.$$c2005
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000049700 440_0 $$013562$$aElectrochemical and Solid State Letters$$v8$$x1099-0062$$y10
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000049700 520__ $$aWe report on numerical simulations of the grain-boundary varistor behavior recently observed in Y2O3-doped CeO2 of high purity. The aim of this study is to disclose the nature of the nonlinear electrical properties of the grain boundaries in oxygen ion conductors. Under small voltages (< 25 mV), the simulation shows a linear current-voltage relation dominated by the grain-boundary resistance. Under intermediate voltages (25-200 mV), the simulation discloses a grain-boundary resistance breakdown and a nonlinear current-voltage relation. The increase of ionic charge carriers in the grain-boundary space-charge layer is the cause for the nonlinear behavior. Calculations are compared to experimental results. (c) 2005 The Electrochemical Society.
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